ࡱ>  '` #7bjbj$$ [E FF?bRRRR222Dz#z#z##TN+R'>4QFRRJR_"3puxvxxxxxx$h[r2ҫ]0_ҫҫRRRJR 2ҫv RR:2JRvҫvvE@22RJR24 ~ z#HVI|v!<'J͡͡2R2R͡2e<wf$ ! - wwwxwww'ҫҫҫҫRRRU6 DRRR6 v4RRRRRR  December 2010 Teacher's Guide Table of Contents  TOC \o "1-3" \h \z \u  HYPERLINK \l "_Toc278311380" About the Guide  PAGEREF _Toc278311380 \h 3  HYPERLINK \l "_Toc278311381" Student Questions  PAGEREF _Toc278311381 \h 4  HYPERLINK \l "_Toc278311382" Answers to Student Questions  PAGEREF _Toc278311382 \h 6  HYPERLINK \l "_Toc278311383" ChemMatters Puzzle: Forward and Back  PAGEREF _Toc278311383 \h 11  HYPERLINK \l "_Toc278311384" Answers to the ChemMatters Puzzle  PAGEREF _Toc278311384 \h 13  HYPERLINK \l "_Toc278311385" NSES Correlation  PAGEREF _Toc278311385 \h 14  HYPERLINK \l "_Toc278311386" Anticipation Guides  PAGEREF _Toc278311386 \h 15  HYPERLINK \l "_Toc278311387" Sugar: An Unusual Explosive  PAGEREF _Toc278311387 \h 16  HYPERLINK \l "_Toc278311388" Myths: Chemistry Tells the Truth  PAGEREF _Toc278311388 \h 17  HYPERLINK \l "_Toc278311389" Two Rivers that Refuse to Mix  PAGEREF _Toc278311389 \h 18  HYPERLINK \l "_Toc278311390" Providing Hope, Finding Cures  PAGEREF _Toc278311390 \h 19  HYPERLINK \l "_Toc278311391" Putting Bacteria to Work  PAGEREF _Toc278311391 \h 20  HYPERLINK \l "_Toc278311392" Profiles in Chemistry: Joseph Francisco, President of the American Chemical Society  PAGEREF _Toc278311392 \h 21  HYPERLINK \l "_Toc278311393" Reading Strategies  PAGEREF _Toc278311393 \h 22  HYPERLINK \l "_Toc278311394" Sugar: An Unusual Explosive  PAGEREF _Toc278311394 \h 23  HYPERLINK \l "_Toc278311395" Myths: Chemistry Tells the Truth  PAGEREF _Toc278311395 \h 24  HYPERLINK \l "_Toc278311396" Two Rivers that Refuse to Mix  PAGEREF _Toc278311396 \h 25  HYPERLINK \l "_Toc278311397" Providing Hope, Finding Cures  PAGEREF _Toc278311397 \h 26  HYPERLINK \l "_Toc278311398" Putting Bacteria to Work  PAGEREF _Toc278311398 \h 27  HYPERLINK \l "_Toc278311399" Profiles in Chemistry: Joseph Francisco, President of the American Chemical Society  PAGEREF _Toc278311399 \h 28  HYPERLINK \l "_Toc278311400" Sugar: An Unusual Explosive  PAGEREF _Toc278311400 \h 29  HYPERLINK \l "_Toc278311401" Background Information (teacher information)  PAGEREF _Toc278311401 \h 29  HYPERLINK \l "_Toc278311402" Connections to Chemistry Concepts (for correlation to course curriculum)  PAGEREF _Toc278311402 \h 41  HYPERLINK \l "_Toc278311403" Possible Student Misconceptions (to aid teacher in addressing misconceptions)  PAGEREF _Toc278311403 \h 41  HYPERLINK \l "_Toc278311404" Anticipating Student Questions (answers to questions students might ask in class)  PAGEREF _Toc278311404 \h 42  HYPERLINK \l "_Toc278311405" In-class Activities (lesson ideas, including labs & demonstrations)  PAGEREF _Toc278311405 \h 42  HYPERLINK \l "_Toc278311406" Out-of-class Activities and Projects (student research, class projects)  PAGEREF _Toc278311406 \h 47  HYPERLINK \l "_Toc278311407" References (non-Web-based information sources)  PAGEREF _Toc278311407 \h 47  HYPERLINK \l "_Toc278311408" Web Sites for Additional Information (Web-based information sources)  PAGEREF _Toc278311408 \h 48  HYPERLINK \l "_Toc278311409" Myths: Chemistry Tells the Truth  PAGEREF _Toc278311409 \h 50  HYPERLINK \l "_Toc278311410" Background Information (teacher information)  PAGEREF _Toc278311410 \h 50  HYPERLINK \l "_Toc278311411" Connections to Chemistry Concepts (for correlation to course curriculum)  PAGEREF _Toc278311411 \h 57  HYPERLINK \l "_Toc278311412" Possible Student Misconceptions (to aid teacher in addressing misconceptions)  PAGEREF _Toc278311412 \h 57  HYPERLINK \l "_Toc278311413" Anticipating Student Questions (answers to questions students might ask in class)  PAGEREF _Toc278311413 \h 58  HYPERLINK \l "_Toc278311414" In-class Activities (lesson ideas, including labs & demonstrations)  PAGEREF _Toc278311414 \h 59  HYPERLINK \l "_Toc278311415" Out-of-class Activities and Projects (student research, class projects)  PAGEREF _Toc278311415 \h 60  HYPERLINK \l "_Toc278311416" References (non-Web-based information sources)  PAGEREF _Toc278311416 \h 60  HYPERLINK \l "_Toc278311417" Web Sites for Additional Information (Web-based information sources)  PAGEREF _Toc278311417 \h 61  HYPERLINK \l "_Toc278311418" Two Rivers that Refuse to Mix  PAGEREF _Toc278311418 \h 64  HYPERLINK \l "_Toc278311419" Background Information (teacher information)  PAGEREF _Toc278311419 \h 64  HYPERLINK \l "_Toc278311420" Connections to Chemistry Concepts (for correlation to course curriculum)  PAGEREF _Toc278311420 \h 74  HYPERLINK \l "_Toc278311421" Possible Student Misconceptions (to aid teacher in addressing misconceptions)  PAGEREF _Toc278311421 \h 74  HYPERLINK \l "_Toc278311422" Anticipating Student Questions (answers to questions students might ask in class)  PAGEREF _Toc278311422 \h 75  HYPERLINK \l "_Toc278311423" In-class Activities (lesson ideas, including labs & demonstrations)  PAGEREF _Toc278311423 \h 75  HYPERLINK \l "_Toc278311424" Out-of-class Activities and Projects (student research, class projects)  PAGEREF _Toc278311424 \h 76  HYPERLINK \l "_Toc278311425" References (non-Web-based information sources)  PAGEREF _Toc278311425 \h 77  HYPERLINK \l "_Toc278311426" Web Sites for Additional Information (Web-based information sources)  PAGEREF _Toc278311426 \h 77  HYPERLINK \l "_Toc278311427" Providing Hope, Finding Cures  PAGEREF _Toc278311427 \h 80  HYPERLINK \l "_Toc278311428" Background Information (teacher information)  PAGEREF _Toc278311428 \h 80  HYPERLINK \l "_Toc278311429" Connections to Chemistry Concepts (for correlation to course curriculum)  PAGEREF _Toc278311429 \h 86  HYPERLINK \l "_Toc278311430" Possible Student Misconceptions (to aid teacher in addressing misconceptions)  PAGEREF _Toc278311430 \h 86  HYPERLINK \l "_Toc278311431" Anticipating Student Questions (answers to questions students might ask in class)  PAGEREF _Toc278311431 \h 86  HYPERLINK \l "_Toc278311432" In-class Activities (lesson ideas, including labs & demonstrations)  PAGEREF _Toc278311432 \h 87  HYPERLINK \l "_Toc278311433" Out-of-class Activities and Projects (student research, class projects)  PAGEREF _Toc278311433 \h 87  HYPERLINK \l "_Toc278311434" References (non-Web-based information sources)  PAGEREF _Toc278311434 \h 88  HYPERLINK \l "_Toc278311435" Web sites for Additional Information (Web-based information sources)  PAGEREF _Toc278311435 \h 88  HYPERLINK \l "_Toc278311436" Putting Bacteria to Work  PAGEREF _Toc278311436 \h 90  HYPERLINK \l "_Toc278311437" Background Information (teacher information)  PAGEREF _Toc278311437 \h 90  HYPERLINK \l "_Toc278311438" Connections to Chemistry Concepts (for correlation to course curriculum)  PAGEREF _Toc278311438 \h 93  HYPERLINK \l "_Toc278311439" Possible Student Misconceptions (to aid teacher in addressing misconceptions)  PAGEREF _Toc278311439 \h 93  HYPERLINK \l "_Toc278311440" Anticipating Student Questions (answers to questions students might ask in class)  PAGEREF _Toc278311440 \h 94  HYPERLINK \l "_Toc278311441" In-class Activities (lesson ideas, including labs & demonstrations)  PAGEREF _Toc278311441 \h 94  HYPERLINK \l "_Toc278311442" Out-of-class Activities and Projects (student research, class projects)  PAGEREF _Toc278311442 \h 96  HYPERLINK \l "_Toc278311443" References (non-Web-based information sources)  PAGEREF _Toc278311443 \h 97  HYPERLINK \l "_Toc278311444" Web Sites for Additional Information (Web-based information sources)  PAGEREF _Toc278311444 \h 97  About the Guide Teachers Guide editors William Bleam, Donald McKinney, Ronald Tempest, and Erica K. Jacobsen created the Teachers Guide article material. Susan Cooper prepared the national science education content, anticipation guides, and reading guides. David Olney created the puzzle. E-mail:  HYPERLINK "mailto:djolney@verizon.net" djolney@verizon.net Patrice Pages, ChemMatters editor, coordinated production and prepared the Microsoft Word and PDF versions of the Teachers Guide. E-mail:  HYPERLINK "mailto:chemmatters@acs.org" chemmatters@acs.org Articles from past issues of ChemMatters can be accessed from a CD that is available from the American Chemical Society for $30. The CD contains all ChemMatters issues from February 1983 to April 2008. The ChemMatters CD includes an Index that covers all issues from February 1983 to April 2008. The ChemMatters CD can be purchased by calling 1-800-227-5558. Purchase information can be found online at  HYPERLINK "http://chemistry.org/chemmatters/cd3.html" www.acs.org/chemmatters Student Questions Sugar: An Unusual Explosive What was the cause of the explosions at the Imperial Sugar Companys refinery? What are the three characteristics of all explosions? What evidence does the article give to illustrate that sugar contains energy? What accounts for the large increase in volume when sugar burns? According to the article, what are enzymes? What is the name for the combustion of sugar happening inside the cells of our bodies? So, if combustion of sugar is occurring inside our bodies, why dont we explode, or at least ignite? List the factors that affect the rates of chemical reactions. OK, if sugar inside our bodies doesnt explode, then, why did the refinery explode? Is sugar the only substance that produces dust explosions? Is flammable dust always a problem? If dust explosions are a big problem in industry, is anyone doing anything about it? Myths: Chemistry Tells the Truth What is a magnetron and how does it operate? How was the idea of cooking food with microwaves discovered? What distinguishes one type of electromagnetic radiation from another, such as microwaves, visible light waves, radio waves, and X-rays? How do microwaves heat food? What does it mean that window glass is amorphous? Is glass a liquid or a solid? What has caused unevenness in old samples of glass? Does glass flow over time? Two Rivers that Refuse to Mix What portion of the earths oxygen is produced by the rainforest? What is the meeting of the waters, and where does it take place? Name four ways in which the waters of the two rivers differ. Why is Rio Negro water dark? What acid is produced by decaying organic matter along the Rio Negro? Does the Rio Negros pH of 3.5 make it acidic or basic? Compare the acidity of water from the Rio Negro to water in A healthy lake. An acidic lake. With all the decaying organic matter in waters of the Rio Negro acting as nutrients, why arent there more aquatic plants and animals present in the Rio Negro? Name four ways the Rio Negros chemistry affects plants, animals and people. Name four differences between the two rivers that explain why their waters dont easily mix. Besides reducing the variety and number of species of plants and animals living in the Rio Negro, what four other effects are produced by the decaying plant material? Providing Hope, Finding Cures Elion received her undergraduate degree in chemistry from what college in New York City? Where did Elion earn her PhD degree? Name the research director at the Burroughs Wellcome Company who first hired Elion as a researcher. Name the four nucleotide bases that make up DNA and identify the ones that Elion modified. Identify the chemical functional group in the first purine compound that Elion synthesized. Elions 6-mercaptopurine is effective in treating which type of cancer? In what category did Elion and Hitchings win the Nobel Prize in 1988? Putting Bacteria to Work What is a microbial fuel cell (MFC)? How do bacteria convert waste into electricity? What is the difference between a closed chemical system and an open system, using a household battery and a fuel cell as examples? What is the difference between an anode and a cathode in a fuel cell? How is an electric current (flow of electrons) produced in a fuel cell? What is the function of a catalyst in a fuel cell? How does a microbial fuel cell differ from a regular fuel cell? What is the difference in set-up between a regular saltwater microbial fuel cell and one that desalts oceanic seawater? How does the desalination MFC work to produce less salty water? What is the added value of using sewage and wastewater as the fuel for microbial fuel cells (MFCs), besides generating electricity? Answers to Student Questions Sugar: An Unusual Explosive What was the cause of the explosions at the Imperial Sugar Companys refinery? The cause of the refinery explosion was sugar (dust). What are the three characteristics of all explosions? The three characteristics of all explosions are: A large release of energy Production of gas molecules that expand quickly (causing an increase in volume) A rapid rate of reaction What evidence does the article give to illustrate that sugar contains energy? The evidence given in the article that shows sugar contains energy is that A marshmallow, almost completely sugar, burns like a torch, and We eat sugar to produce energy inside our bodies. What accounts for the large increase in volume when sugar burns? The large increase in volume when sugar burns is caused by the increase in moles of gas produced when combustion occurs, from 12 moles of gaseous reactants (O2), to 23 moles of gaseous products (12 moles of CO2 and 11 moles of H2O). According to the article, what are enzymes? The author says enzymes are the large molecules inside cells that, at least in this case, control the combustion of sugar inside our bodies. What is the name for the combustion of sugar happening inside the cells of our bodies? Combustion occurring inside the cells of our bodies is called respiration. So, if combustion of sugar is occurring inside our bodies, why dont we explode, or at least ignite? There is no explosion or flames inside our bodies when sugar combusts because the process captures and releases the energy in many steps, releasing smaller amounts of energy at a time and storing that energy. List the factors that affect the rates of chemical reactions. Factors affecting the rate of chemical reactions include: The nature of the reactants The physical state of the reactants (solid, liquid or gas) Temperature Pressure Amount of surface area of the particles OK, if sugar inside our bodies doesnt explode, then, why did the refinery explode? The refinery exploded because the sugar had been ground into very fine particles. The finer the particles, the more surface area there is on each particle that is exposed to air molecules, and that can react with oxygen in the air. In addition, small particles heat up quickly, generating a visible flame and shock wave. The fine particles of sugar dust filled the air in the refinery, allowing a spark or flame from a machine (or man) started the reaction. The initial explosion then stirred up all the dust lying on the floor and other machinery, adding to the severity of the devastation. Is sugar the only substance that produces dust explosions? Other types of industry explosions that are prevalent include coal, flour, metals, plastics and wood. More than 350 dust explosions have occurred in the US in the last 30 years. Is flammable dust always a problem? Flammable dust can be an advantage. For example, coal dust burns much more cleanly than lumps of coal. And in gasoline engines, liquid gasoline fuel is sprayed into the cylinders via fuel injectors as a fine mist. The finer particles burn much more quickly, and it is almost completely consumed in the burning process. If dust explosions are a big problem in industry, is anyone doing anything about it? The Chemical Safety and Hazard Investigation Board (CSB) and the Occupational Safety and Health Administration (OSHA) are both concerned with these explosions. OSHA is working on new standards (2009) to a) control the amount of dust present, b) eliminate sources of ignition within the plant, and c) control damage if an explosion occurs. Myths: Chemistry Tells the Truth What is a magnetron and how does it operate? A magnetron is a radar tube that generates microwave radiation. It releases pulses of microwaves that bounce off any object in their path. The object returns a tiny part of the waves energy to a dish or antenna, which is usually located at the same site as the magnetron. How was the idea of cooking food with microwaves discovered? By 1946, the Raytheon Corporation had already done a lot experimenting with magnetrons, radar tubes that generate microwave radiation. An engineer walked by a row of the tubes that were in operation. As he did, a candy bar in his pocket turned soft and gooey. He then successfully experimented with cooking popcorn kernels and a raw egg. What distinguishes one type of electromagnetic radiation from another, such as microwaves, visible light waves, radio waves, and X-rays? What distinguishes one type of radiation from the next is its wavelengththe distance between two successive crests in a wave. The microwaves used to cook food have a wavelength of 12.24 cm. Other types of radiation have different wavelengths. How do microwaves heat food? Inside a microwave oven, microwaves produce constantly changing electric fields in the food. The polar water molecules in the food react to the electric field by rotating. As the water molecules rotate (2.45 billion times a second), they bump other molecules. As all these water molecules move, they generate heat. As a result, microwave energy is converted to thermal energy, which heats food. What does it mean that window glass is amorphous? An amorphous substance, such as window glass, has no discernible crystal structure. Its molecules are not arranged periodically, much like a liquid. Is glass a liquid or a solid? Glass is a solid with a structure resembling that of a liquid, but it is a solid. What has caused unevenness in old samples of glass? The unevenness has to do with how glass windows were made. They were made by hand, using a blob of molten glass that was spun to create a relatively flat, round plate. After cooling, sections were sliced from the plate to form windowpanes. Often, the panes were not uniform in thickness. Does glass flow over time? No, glass does not flow. Study has shown that windowpane glass exhibits no flow; old glass samples have also shown no flow. Two Rivers that Refuse to Mix What portion of the earths oxygen is produced by the rainforest? It is estimated that the rainforest produces 25% of all the oxygen we breathe. What is the meeting of the waters, and where does it take place? The meeting of the waters is the place where the Amazon River meets the Rio Negro. It happens at Manaus, Brazil. Name four ways in which the waters of the two rivers differ. The waters of the two rivers differ in a) TemperatureRio Negro is warm, Amazon is cool; b) DepthRio Negro is shallow, Amazon is deep; c) Rate of flowRio Negro is slow, Amazon is rapid, and d) ColorRio Negro is brown (tea color), Amazon is blue. Why is Rio Negro water dark? Water in the Rio Negro is dark because of slowly decaying plant material. What acid is produced by decaying organic matter along the Rio Negro? Humic acid is produced by decaying plant matter along the Rio Negro. Does the Rio Negros pH of 3.5 make it acidic or basic? The Rio Negros pH of 3.5 makes it very acidic. Compare the acidity of water from the Rio Negro to water in A healthy lake. An acidic lake. A comparison of the acidity of water from the Rio Negro and lakes shows that Water from the Rio Negro is more acidic than water from a healthy lake (pH = 3.5 vs. pH = 6.5). Water from the Rio Negro is even more acidic than water from an acidic lake (pH = 3.5 vs. pH = 4.5). With all the decaying organic matter in waters of the Rio Negro acting as nutrients, why arent there more aquatic plants and animals present in the Rio Negro? Even though the Rio Negro is rich in nutrients, it contains relatively low levels of chloride and magnesium ions, needed for plant and animal growth. These and other types of free ions are bound to humic acid molecules, thereby depleting the river water. Name four ways the Rio Negros chemistry affects plants, animals and people. Four ways the Rio Negros chemistry affects plants, animals and people are: Only about a dozen species of fish live in the Rio Negro, compared to hundreds in the Amazon. Since fish for food are scarce in the Rio Negro, only about 250 species of animals live along the Rio Negro, versus thousands along the Amazon. People living along the Rio Negro have more limited resources (fewer animal species to hunt and eat) than along the Amazon. Almost no mosquitoes live along the Rio Negro, vastly reducing mosquito-borne diseases there. Name four differences between the two rivers that explain why their waters dont easily mix. Four differences in the two rivers waters that explain why they dont mix are: Velocity of river water Temperature Acidity Density Besides reducing the variety and number of species of plants and animals living in the Rio Negro, what four other effects are produced by the decaying plant material? The four other effects produced by decaying plant material are: Decaying plant material builds up on the bottom of the river, thereby raising the floor of the river, making it shallower than the Amazon. This slows the rate of flow of the river. The slower rate of flow and the shallower water allows the sun to heat the river to warmer water temperatures than those of the Amazon. And warmer temperatures increase the solubility of the decayed material, thereby increasing the density of the waters of the Rio Nero compared to that of the Amazon. Providing Hope, Finding Cures Elion received her undergraduate degree in chemistry from what college in New York City? Elion graduated from Hunter College, with honors, at age 19. Where did Elion earn her PhD degree? This is a trick question. Elion never earned a PhD. She is one of the few Nobel Prize winners who do not have a PhD. Name the research director at the Burroughs Wellcome Company who first hired Elion as a researcher. George Hitchings, who also earned the Nobel Prize in Physiology or Medicine with Elion in 1988, first hired Elion at Burroughs Wellcome Company. Sir James W. Black was also awarded the Prize in Physiology or Medicine that year for his work on drugs to treat angina pectoris, myocardial infarction, high blood pressure and peptic ulcer. Blacks work was not related to the work that Elion and Hitchings did. Name the four nucleotide bases that make up DNA and identify the ones that Elion modified. The four nitrogenous bases are adenine, guanine, cytosine and thymine. Elion modified the two purinesadenine and guanine. Identify the chemical functional group in the first purine compound that Elion synthesized. The compound was 2, 6-diaminopurine and the important functional group was the amine group, -NH2. Elions 6-mercaptopurine is effective in treating which type of cancer? The drug 6-mercaptopurine is still in use treating leukemia. In what category did Elion and Hitchings win the Nobel Prize in 1988? Elion and Hitchings won the Nobel Prize in Physiology or Medicine. Putting Bacteria to Work What is a microbial fuel cell (MFC)? A microbial fuel cell is a device in which bacteria consume food leftovers, sewage, and animal waste and produce electricity. How do bacteria convert waste into electricity? The bacteria digest or convert the waste into smaller pieces (molecules) that on further degradation (chemical reaction) release electrons. What is the difference between a closed chemical system and an open system, using a household battery and a fuel cell as examples? A battery is a closed system which means no chemicals are added to the system whereas a fuel cell has a constant flow of chemicals (the fuel) into its system. What is the difference between an anode and a cathode in a fuel cell? An anode is made of a material that gives up electrons easily whereas the cathode is made of a material that readily accepts electrons. How is an electric current (flow of electrons) produced in a fuel cell? When a chemical reaction occurs involving something like hydrogen (the fuel), the hydrogen loses an electron in the presence of an anode catalyst, forming a hydrogen ion (H+). The hydrogen ion passes through a barrier (an electrolyte membrane) separate from the electron. The hydrogen ion meets an electron and an oxygen molecule at another electrode, the cathode. The hydrogen ion plus the oxygen molecule that gains electrons react to form water. The loss of an electron by the hydrogen creates an electric current, the flow of electrons. What is the function of a catalyst in a fuel cell? A catalyst helps to break the bond between the hydrogen atoms in a hydrogen molecule, H2, so they separate in the form of hydrogen ions, H+, along with the two electrons present in the molecule. How does a microbial fuel cell differ from a regular fuel cell? A microbial fuel cell uses organic waste as the fuel rather than hydrogen. What is the difference in set-up between a regular saltwater microbial fuel cell and one that desalts oceanic seawater? In the desalting MFC, there are two membranes rather than just one that separate the anode region from the cathode area. How does the desalination MFC work to produce less salty water? The set-up for this type of MFC involves the use of two membranes that separate the two electrodes (anode and cathode), in between which is found the sea water. The anode membrane is negatively charged and attracts the positive ions (have lost electrons at the anode) that are produced in the fuel cell chemical reaction as well as the positively charged sodium ions in seawater. The cathode membrane is positively charged and attracts negatively charged ions produced in the MFC chemical reaction as well as the negatively charged chloride ions in the seawater. What is the added value of using sewage and wastewater as the fuel for microbial fuel cells (MFCs), besides generating electricity? In using the sewage and wastewater as fuel for the MFCs, the bacteria used in the conversion process to make electricity also reduce the pollution in the water. ChemMatters Puzzle: Forward and Back Here are two puzzles that will get you thinking in BOTH directions! We have come up with several four-letter words or terms that can be placed in the grid left and right, one letter to a square. Half go left to right, starting in an odd-numbered square. Weve shown you the answer to 1 to 2, SLAG, as an example. The other half reads right to left, going from even numbers to odd numbers. GALA reads from square 2 to 3. And so it goes. We are supplying clues for each term to the right of each puzzle. The majority of them are part of a scientists vocabulary. Puzzle number 2 is a bit tougher than #1. Working backwards from grid to clues will help you complete both puzzles in short orderin whichever direction you choose! Puzzle 1 1 S L A 2 G3 A L  4 5    6 7    8 9    10 11   12 CLUES 1-2 Debris left over in smelting Fe2O3 ore 2-3 A big celebration 3-4 Potassium Aluminum sulfate, as an example 4-5 A sub-atomic particle, mass about 200 x that of an electron 5-6 A popular science show on PBS 6-7  Rara ____ , a rare bird indeed ! 7-8 A trig function, opposite / hypotenuse 8-9 When H is + 10 units, reaction is ____thermic. 9-10 One of the physical properties of a chemical 10-11 Part of a plant that is underground 11-12 A non-SI unit for pressure exerted by gases Puzzle 2 CLUES (enter chemical symbols in all capital letters) 1   1-2 One of the few metallic elements that are ferromagnetic 2-3 Christmas time in France 3-4 Element of atomic number 82 4-5 Information collected in a laboratory experiment 5-6 What a molecule is composed of (singular) 6-7 6x1023 items of a kind 7-8 Pizzazz, flair, ardor 8-9 Formula of a HALIDE salt 9-10 Formula of an ALKALI metal salt 10-11 Term used when adding fractions (plural) 11-12 PIERRE is the capital of this state (abbreviation) 12-13 Kids auto, a go-____ 13-14 Weight system in use since medieval times 14-15 A widely used exercise/ meditation system 15-16 Formula of one product of the mixing solutions of silver nitrate and potassium chloride   2 3    4 5    6 7    8 9   10 11   12 13   14 15  16 Answers to the ChemMatters Puzzle Puzzle 1 1 S L A 2 G3 A L U 4 M 5 N O V 6 A7 S I N 8 E9 O D O 10 R11 T O R12 RCLUES 1-2 Debris left over in smelting Fe2O3 ore 2-3 A big celebration 3-4 Potassium Aluminum sulfate, as an example 4-5 A sub-atomic particle, mass about 200 x that of an electron 5-6 A popular science show on PBS 6-7  Rara ____ , a rare bird indeed ! 7-8 A trig function, opposite / hypotenuse 8-9 When H is + 10 units, reaction is ____thermic. 9-10 One of the physical properties of a chemical 10-11 Part of a plant that is underground 11-12 A non-SI unit for pressure exerted by gases Puzzle 2 CLUES (enter chemical symbols in all capital letters) 1 I R1-2 One of the few metallic elements that are ferromagnetic 2-3 Christmas time in France 3-4 Element of atomic number 82 4-5 Information collected in a laboratory experiment 5-6 What a molecule is composed of (singular) 6-7 6x1023 items of a kind 7-8 Pizzazz, flair, ardor 8-9 Formula of a HALIDE salt 9-10 Formula of an ALKALI metal salt 10-11 Term used when adding fractions (plural) PIERRE is the capital of this state (abbreviation) Kids auto, a go-____ Weight system in use since medieval times A widely used exercise/ meditation system 15-16 Formula of one product of the mixing solutions of silver nitrate and potassium chloride  O 2 N 3 L E A 4 D5 A T O 6 M7 E L A 8 N9 R B C10 L11 S D A12 K13 T R O14 Y15 A G16C L NSES Correlation National Science Education Content Standards Addressed National Science Education Content Standard Addressed As a result of activities in grades 9-12, all students should develop understanding SugarMythsTwo Rivers Providing Hope, Finding Cures Putting Bacteria to WorkProfiles in Chemistry: Joseph Francisco Science as Inquiry Standard A: about scientific inquiry.((((((Physical Science Standard B: of the structure and properties of matter.((((Physical Science Standard B: of chemical reactions.(((Science and Technology Standard E: about science and technology.(((((Science in Personal and Social Perspectives Standard F: of personal and community health.(Science in Personal and Social Perspectives Standard F: about natural resources.(Science in Personal and Social Perspectives Standard F: about natural and human-induced hazards.(Science in Personal and Social Perspectives Standard F: about environmental quality.((Science in Personal and Social Perspectives Standard F: of science and technology in local, national, and global challenges.((((History and Nature of Science Standard G: of science as a human endeavor.((History and Nature of Science Standard G: of the nature of scientific knowledge.(((((History and Nature of Science Standard G: of historical perspectives.((( Anticipation Guides Anticipation guides help engage students by activating prior knowledge and stimulating student interest before reading. If class time permits, discuss students responses to each statement before reading each article. As they read, students should look for evidence supporting or refuting their initial responses. Directions for all Anticipation Guides: Before reading, in the first column, write A or D, indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. Sugar: An Unusual Explosive Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatement Some explosions have a slow reaction rate.Enzymes control the rate of chemical reactions in the cells in our bodies.The rate of chemical reactions depends in part on the surrounding temperature and pressure.If a large cube is divided into 1000 small cubes, the total surface of the small cubes is 1000 times the surface area of the large cube.Increasing the amount of surface increases the reaction rate because the number of collisions between molecules increases.Scientists define dust as particles less than 500 micrometers in size.Dust explosions are unusual in factories in the U. S. because of the expensive exhaust systems that are used.Some dust particles are more likely to cause explosions than others. Myths: Chemistry Tells the Truth Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatementAll forms of electromagnetic radiation travel at the same speed in a vacuum.Microwaves have a very short wavelength, less than 1 mm.Since water is a polar molecule, it absorbs microwave energy easily.When molecules move, they generate heat.Microwave ovens heat food from the inside out.Glass is a liquid.Viscous substances flow easily.Windows with thicker glass at the bottom are more stable. Two Rivers that Refuse to Mix Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatementThe Amazon rainforest produces one-tenth of all the oxygen we breathe.The Amazon River is cool and blue.The Rio Negro is acidic due to the organic decay of trees and shrubs near the river.Bases are commonly found in cleaning agents, while acids are commonly found in foods.The pH scale measures the concentration of hydrogen ions in solution.A substance with a pH of 11 is highly acidic.The Rio Negro and the Amazon both have thousands of species of animals living on their banks.Mosquitoes thrive in acidic water.Increases in temperature increases the density of most substances. Providing Hope, Finding Cures Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatementGertrude Elion worked to apply chemistry to helping others.Elion was quickly hired as a researcher after graduating with honors from Hunter College in New York City because of her intelligence and enthusiasm.Elion was hired as a researcher at a major pharmaceutical company after earning her Ph.D.The molecules that make up DNA can be used to make medications that fight cancer.Functional groups change the chemical properties of compounds.Elion tested more than 100 compounds before finding one that helps cure childhood leukemia.There are no drugs available that can prevent viruses from multiplying. Putting Bacteria to Work Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatementThree-quarters of the people living in Africa do not have electricity.Unlike batteries, fuel cells do not die.Anodes give up protons easily.The same chemical reaction occurs at the anode and cathode in a fuel cell.Microbial fuel cells are already commercially available in Tanzania.Oxygen from the air is important in the operation of microbial fuel cells.Microbial desalination fuel cells that produce electricity and desalinate water at the same time are being developed. Profiles in Chemistry: Joseph Francisco, President of the American Chemical Society Directions: Before reading, in the first column, write A or D indicating your agreement or disagreement with each statement. As you read, compare your opinions with information from the article. In the space under each statement, cite information from the article that supports or refutes your original ideas. MeTextStatementFrancisco became interested in chemistry at an early age. Undergraduate researchers are not allowed to conduct experiments at universities.X-ray crystallographers determine how atoms are arranged in crystals.It usually takes about two years to complete a Ph.D.While working toward a Ph.D., scientists develop critical thinking skills by doing original research.Postdoctoral (postdoc) work is temporary.It is common for research chemists to work with other chemists from around the world.Writing and speaking well in your native language is not important in chemical research because mostly math and equations are involved.Reading Strategies These matrices and organizers are provided to help students locate and analyze information from the articles. Student understanding will be enhanced when they explore and evaluate the information themselves, with input from the teacher if students are struggling. Encourage students to use their own words and avoid copying entire sentences from the articles. The use of bullets helps them do this. If you use these reading strategies to evaluate student performance, you may want to develop a grading rubric such as the one below. ScoreDescriptionEvidence4ExcellentComplete; details provided; demonstrates deep understanding.3GoodComplete; few details provided; demonstrates some understanding.2FairIncomplete; few details provided; some misconceptions evident.1PoorVery incomplete; no details provided; many misconceptions evident.0Not acceptableSo incomplete that no judgment can be made about student understanding Sugar: An Unusual Explosive Directions: The reasons explosions occur are listed in the left column. As you read, provide specific reasons for why the sugar company plant exploded and burned Explosions need:What contributed to this problem at the sugar plant?Large release of energyProduction of gas molecules that expand quicklyRapid reaction rate Myths: Chemistry Tells the Truth Directions: As you read, complete the chart below by providing evidence to explain the myths. Myth 1: Microwaves heat food from the inside outComponentDescriptionImportance in answering questionMicrowavesWaterMyth 2: The bottoms of old windows are thicker because glass, being a liquid, flows over time.DescriptionImportance in answering questionGlass structureSolids Old windowpanes Two Rivers that Refuse to Mix Directions: As you read, complete the chart below comparing the two rivers in Brazil. Property or characteristicRio NegroAmazonReason for the difference (if stated in the article)ColorFlow rateTemperaturepHDensityFishAnimals along the banks Providing Hope, Finding Cures Directions: As you read, complete the chart below describing Gertrude Elions life and work. Use bullets or numbers for each point you make. Early challenges (at least 3)Ideas about drugs to fight cancer (at least 2)Chemicals she synthesized (at least 2)Achievements (at least 3) Putting Bacteria to Work Directions: As you read, complete the chart below comparing hydrogen fuel cells, microbial fuel cells, and microbial desalination cells. Hydrogen fuel cellMicrobial fuel cellMicrobial desalination cellAnode reactionCathode reactionNet reactionDirection of electron flowSource of O2Which one has two membranes? Why are they needed?Which could remove toxic chemicals from wastewater?Who is working on this technology?Where might this technology be used? Profiles in Chemistry: Joseph Francisco, President of the American Chemical Society Directions: As you read, think about Franciscos life and work. What are your goals? How does the information in the article relate to your future plans? Write four things Francisco did or pieces of advice he provided that would be helpful to do or try even if you are not planning to become a chemist. Sugar: An Unusual Explosive Background Information (teacher information) More on the history of explosives The Teachers Guide to the April, 2008 ChemMatters issue contained information about explosives used in landmines. The guide included the following information about the history of explosives. (The Teachers Guide is available on the 25-year ChemMatters CD (see the References section below for information about obtaining the CD), or online at  HYPERLINK "http://www.chemmatters.org" http://www.chemmatters.org.) The first explosive used by people was black powder, which was invented in China in around the 9th Century A.D. Black powder is a mixture of charcoal (carbon), sulfur, and potassium nitrate. The Chinese first used black powder to invent fireworks. Soon after, they developed military rockets propelled by black powder. The knowledge of black powder made its way westward rather quickly for the time, as the English monk and alchemist Roger Bacon wrote about it in the year 1260. Eventually, people in Europe and the Middle East used black powder to invent cannons. Aside from fireworks, the use of black powder for peaceful purposes was slower to develop. By the 1800s, black powder was being used in engineering projects such as making cuts in rock for railroad construction. This was dangerous business, as black powder could often ignite prematurely, posing a serious risk for the workers who set and detonated the explosive charges. During the construction of the U.S. transcontinental railroad, many Chinese workers were killed in black powder accidents while blasting tunnels and cuts through Californias Sierra Nevada Mountains. Nitroglycerin proved to be a powerful and useful explosive during the same time period, but it suffered from the same problems as black powder, specifically that it was dangerous to handle. A shock could easily set it off, making it difficult to transport, especially in an age where smooth, paved roads were few and far between. Swedish chemist Alfred Nobel solved this problem by mixing nitroglycerin with diatomaceous earth, a form of silica, to form a paste that was much safer to handle. Nobels dynamite was much more resistant to shock than straight nitroglycerin, and quickly became a popular explosive for civil engineering projects as well as for military use. Another explosive was discovered by accident in 1846 when Swiss chemist Christian Schnbein accidentally spilled nitric acid on a piece of cotton. The resultant nitrocellulose found many uses. As one of the first moldable plastics to see widespread use, nitrocellulose was used to make shirt collars, billiard balls, and photographic film. However, being flammable and explosive, its use in photographic film often led to movie theater fires as nitrate film was ignited by the heat of projector bulbs. In the western U.S., there were accounts of billiard balls popping explosively on the break, hurting no one but sending cowboys reaching for their six guns. The explosive nature of nitrocellulose was quickly harnessed, and gun cotton soon replaced black powder as a propellant for firearms, from handguns to heavy artillery. The main advantage of nitrocellulose was that it burned without smoke, unlike black powder. Trinitrotoluene was prepared by Joseph Wilbrand in 1863, but its roots go back to 1788, when Haussmann first prepared a similar compound, picric acid, or trinitrophenol. Picric acid is a powerful explosive, but unstable and dangerous to use. Trinitrotoluene is much more stable, and is in fact rather difficult to detonate. It requires a detonator explosive, such as lead (II) azide. (Interestingly, chemists are currently researching green explosives which do not contain lead.) More on the Imperial Sugar Company plant accident Apparently, many problems existed within the Imperial Sugar Companys refinery in Port Wentworth, GA. According to the CSB report, the plant began functioning in 1917. Granulated sugar was stored in three 100-foot high silos. Some of the granulated sugar was then moved to packaging facilities on-site to package it for wholesale distribution. Bucket elevators, screw conveyors and conveyor belts were used to transport the sugar within the plant to make specialty products like powdered sugar and brown sugar. During the transport processes, some of the sugar spilled onto floors, sometimes accumulating as much as 4-5 deep. The sugar also contained fine particles that escaped into the atmosphere within the processing buildings. Hammer mills were used to crush the granulated sugar into powdered sugar. This also produced large amounts of airborne sugar dust. A dust collection system was in place to collect the dust from all the machinery, but the system was apparently under-sized and not functioning properly. And the collection system was not connected to the bucket elevators and conveyor system, allowing the dust to settle onto machinery and the workroom floor. Workers used compressed air to dislodge the dust from machinery, thereby adding to the amount of sugar dust in the air. Over prolonged periods of time, the dust settled on elevated, hard-to-reach surfaces; e.g., pipes, beams and lights. In a tunnel beneath the silos, the sugar flowed through chutes onto long conveyor belts. Sometimes lumps of sugar backed up in the chutes, blocking the flow of sugar on the belts, spilling sugar onto the floor and increasing the amount of sugar dust in the air inside the tunnels. Tunnels were large and ventilated, so dust couldnt build up in the air to explosive levels. But in 2007, the company encased the conveyor belt system in a stainless steel case, to prevent possible contamination of the sugar. No ventilation system was connected to the enclosure. Therefore, sugar dust became trapped inside the casing. On February 7, 2008, clumps of sugar blocked one of the discharge chutes. Its possible that sugar from an adjacent chute spilled off the moving belt, producing dust that could have accumulated to an explosive concentration inside the enclosed space of the conveyor belt. At 7:15 p.m., the sugar dust must have come in contact with a source of ignition, probably an overheated bearing, and the first explosion resulted. This initial explosion demolished the enclosure, sending debris flying into the nearby packaging plant, stirring up all the accumulated dust in those areas, which in turn was ignited by the rapidly advancing flame front. This resulted in a chain reaction of secondary explosions, which caused the infrastructure to crumble, sending the piles of sugar on the floors and transport system of conveyor belts up into the air, causing even more explosions. No emergency evacuation drills had been practiced, and electricity had been cut by the explosions. Workers were trapped with no visible means of evacuation. Eight workers died at the scene, and six more workers died in hospitals later. Thirty-six more workers were injured. The CSB concluded that correspondence dating back to the 1950s showed that managers at Imperial were made aware of the dangers of dust accumulation and the explosive nature of sugar dust. IN 1961, a memo showed that the powdered sugar mill room had undergone a dust explosion that damaged it heavily. Management of the company did not do enough to improve the situation and manage the hazard. In 2006, CSB published the results of a study on the hazards of combustible dust, recommending that OSHA establish a comprehensive combustible dust standard, based on National Fire Protection Agency (NFPA) standards. In October, 2007, OSHA implemented a new program of national emphasis on regulations to increase enforcement of existing regulations regarding combustible dust. Imperial should have learned of the OSHA combustible dust national emphasis program four months before the devastating explosion at Port Wentworth, but management did not act effectively to control the serious dust problem in the packing buildings. As recent as two months before the explosion, internal inspection showed that tons of sugar were still routinely spilling onto the floors. This sugar contributed to the devastating series of secondary explosions. CSB discovered that the Imperial plant at Port Wentworth experienced small fires periodically throughout the years preceding the explosion, all fueled by accumulated dust and spilled sugar, but none of them resulted in a dust explosion. Investigators that plant managers may have been lulled into a false sense of complacency by years of operating without a major accident. The CSB recommended in its report that the Imperial Sugar Company Apply NFPA standards to the design and operation of the rebuilt Port Wentworth facility Develop and implement comprehensive combustible dust control, housekeeping, and training programs Improve emergency evacuation policies and procedures It also notes in its report that companies can go a long way to preventing dust explosion accidents simply by following existing recommendations of the NFPA, but it is also time for a federal standard on combustible dust. OSHA began plans in April, 2009 for this national plan for combustible dust standards. Content from the CSB report, above, was derived from the CSB video, Inferno: Dust Explosion at Imperial Sugar. ( HYPERLINK "http://www.youtube.com/watch?v=Jg7mLSG-Yws" http://www.youtube.com/watch?v=Jg7mLSG-Yws) (The video gives a very detailed simulation/animation of the entire accident at the plant.) In July, 2008, OSHA fined Imperial Sugar Company nearly $9 million for safety violations at its Port Wentworth, Georgia and Gramercy, Louisiana sugar refining sites. These fines were levied in recognition of violations including accumulations of sugar dust in workrooms and on electric motors and other equipment, and because company officials were aware of this and took no action to reduce the obvious hazards. More on fuels and heat of combustion The table below provides data on the heats of combustion of various fuelsand glucose. Note that glucose falls right in line with some of the simpler organic fuels like propane and butane. It also has a higher heat of combustion than the listed alcohols. This reinforces the idea that sugar is a good fuel and a potential heat source for combustion and dust explosions. Fuel HYPERLINK "http://en.wikipedia.org/wiki/Heat_of_combustion"  INCLUDEPICTURE "http://bits.wikimedia.org/skins-1.5/common/images/sort_none.gif" \* MERGEFORMATINET kJ/mol HYPERLINK "http://en.wikipedia.org/wiki/Heat_of_combustion"  INCLUDEPICTURE "http://bits.wikimedia.org/skins-1.5/common/images/sort_none.gif" \* MERGEFORMATINET  HYPERLINK "http://en.wikipedia.org/wiki/Hydrogen" \o "Hydrogen" Hydrogen286 HYPERLINK "http://en.wikipedia.org/wiki/Methane" \o "Methane" Methane889 HYPERLINK "http://en.wikipedia.org/wiki/Ethane" \o "Ethane" Ethane1,560 HYPERLINK "http://en.wikipedia.org/wiki/Propane" \o "Propane" Propane2,220 HYPERLINK "http://en.wikipedia.org/wiki/Butane" \o "Butane" Butane2,877 HYPERLINK "http://en.wikipedia.org/wiki/Pentane" \o "Pentane" Pentane3,535 HYPERLINK "http://en.wikipedia.org/wiki/Gasoline" \o "Gasoline" Gasoline5,508 HYPERLINK "http://en.wikipedia.org/wiki/Paraffin" \o "Paraffin" Paraffin14,800 HYPERLINK "http://en.wikipedia.org/wiki/Kerosene" \o "Kerosene" Kerosene7758 HYPERLINK "http://en.wikipedia.org/wiki/Methanol" \o "Methanol" Methanol726.0 HYPERLINK "http://en.wikipedia.org/wiki/Ethanol" \o "Ethanol" Ethanol1,300.0 HYPERLINK "http://en.wikipedia.org/wiki/Propanol" \o "Propanol" Propanol2,020.0 HYPERLINK "http://en.wikipedia.org/wiki/Acetylene" \o "Acetylene" Acetylene1,300.0 HYPERLINK "http://en.wikipedia.org/wiki/Benzene" \o "Benzene" Benzene3,270.0 HYPERLINK "http://en.wikipedia.org/wiki/Carbon" \o "Carbon" Carbon393.5 HYPERLINK "http://en.wikipedia.org/wiki/Glucose" Glucose2,816 Source of some of the above information is  HYPERLINK "http://en.wikipedia.org/wiki/Heat_of_combustion" http://en.wikipedia.org/wiki/Heat_of_combustion More on explosions Most rapid chemical reactions, like combustion and explosions, involve solids and gases (e.g., dust explosions with solid dust and air), liquids and gases (e.g., liquid fuels burning in air), or gases and gases (e.g., methane, ethane or propane burning in air). Gases are involved in all explosions, since gases are individual atoms or molecules and can react upon impact with other molecules. Solids and liquids involved in explosions must, of necessity, exist as extremely tiny particlesdust or powder in the case of solids, and very tiny droplets or even vapor for liquids. These very tiny particles can then react quickly with gas particles to form new compounds, usually gases, with the subsequent release of large amounts of energy. All combustion or explosive reactions are exothermic. Typically, molecules of gaseous products, like CO2 and H2O, are very stable molecules, while the reactant molecules (the fuel) contain much more stored chemical energy. As the bonds of the fuel molecules are broken and new bonds form in the production of the more stable gaseous products, energy is released from the reacting system. It is this energy that drives molecules to higher and higher velocities, producing greater pressures that eventually result in the explosion. Exceptions to the generalization that all explosions involve gaseous reactants include materials designed to be explosive. These materials typically contain some oxygen within their chemical structure, so they dont need to rely on the presence of oxygen from the air for their combustion, or they are somewhat chemically unstable and simply decompose into more stable molecules, with the release of large amounts of energy. Nitroglycerin, for example, decomposes by the following equation: 4 C3H5N3O9(l) ( 6 N2(g) + 12 CO2(g) + 10 H2O(g) + O2(g) Since the reaction doesnt depend on the presence of oxygen, and since nitroglycerin is chemically unstable, it can react rapidly to form the gaseous products. Note that 4 moles of liquid nitroglycerin reacts to produce a total of 29 moles of gaseous products (6 moles of N2, 12 moles of CO2, 10 moles of steam (H2) and one mole of O2. Assume the volume of the original 4 moles of liquid nitroglycerin to be negligible, compared to the volume of the gases produced in the reaction (remember, theres about a 1000-fold increase in volume as a liquid changes to gas). The volume increase as this reaction proceeds is thus approximately a 30,000-fold change! Add to this that the temperature changes from approximately room temperature (~298 K) to possibly 3000oC (3273 K), and you have another ~10-fold increase in speed of the molecules of the gas products. Now thats molecular motion! (And a huge explosion!) More on fireworks explosions (and rockets) When one thinks of explosions, perhaps the first (peace-time) example that comes to mind is fireworks. Fireworks rely on the build-up of pressure and temperature inside the casing to cause the explosion that hurls the lit pyrotechnics into the air. Further bursts then result in the colors and shapes we all love to see. There are two different types of combustion reactions at work here: rapid reactions resulting in the explosive forces need to hurl the pyrotechnics aloft, and slower reactions that result in the time-delayed reactions that produce the color bursts after the initial launch. The rapid combustion reaction involves black powder packed at the bottom of the aerial shell, the hard paper casing that houses all the chemicals that react. The shell is housed in a mortar, a tube often partially buried in sand or dirt. The black powder is ignited by a quick-burning fuse. As it burns, the black powder produces heat and gases, both of which increase the pressure inside the shell. This is the reaction that propels the rest of the shell out of the mortar up into the air. At the same time that the first quick-burning fuse was ignited, another slower-burning fuse was lit that works its way down through the top of the shell. Inside the rest of the shell are found more gunpowder and materials called stars, small black pellets (3-4 cm in diameter) which contain the light-emitting compounds used in fireworks. A bursting charge in the center of the shell is ignited by the time-delay fuse. When the bursting charge explodes, it ignites the stars and black powder and simultaneously propels them out of the shell into the atmosphere. The stars contain four chemicals: a fuel, an oxidizing agent, a colorant containing ionic compounds of metals that produce color when they are heated, and a binder to hold all the pieces together. When ignited by the fuse, the oxidizing agent and the fuel react together (combust) and produce intense heat and gases. The ionic compounds, under the intense heat of the rapid combustion reaction, produce the colors of the fireworks.  INCLUDEPICTURE "http://static.howstuffworks.com/gif/firework1.gif" \* MERGEFORMATINET  Figure 1. Structure of an aerial shell. The blue balls are the stars, and the purple area is gunpowder. The stars and the powder are surrounding a bursting charge, which also contains black powder. [Credit: 2006 HowStuffWorks] It is not only the large increase in the number of particles of gas (as new gases are produced in combustion) that creates the pressure inside the shell necessary for an explosion; the gases are also exposed to extreme heat inside the shell as the combustion reaction occurs. This huge increase in temperature causes the gas molecules to increase their speed, increasing the pressure inside the shell even more. This double whammy results in the explosion of the shell. This is a great example of Amontons Law (sometimes mistakenly referred to as Gay-Lussacs Law), which states that as temperature increases, gas pressure increases directly, providing amount and volume are constant. The volume remains constant inside the shell until the explosion occurs, at which time the volume increases explosively. (Now we can apply Charles Law of temperature and volume varying directly; since the temperature increased and the pressure can now be let outto atmospheric pressure, the volume will increase proportionally to the temperature increase.) The loud booms that you hear when fireworks explode are actually sonic booms as the gas volume expands so rapidly that the gas front actually (briefly) travels faster than the speed of sound. Both of the ChemMatters articles referenced here contain diagrams of an aerial fireworks shell, and deeper explanations of how fireworks operate. Graham, T. Colors Bursting in Air. ChemMatters. October, 1998 16 (3), pp 7-9 De Antonis, K. Fireworks. ChemMatters. October, 2010 28 (3), pp - A model rocket engines thrust (or that of a real rocket engine, for that matter) can be thought of as a controlled explosion, where the engine itself is designed and engineered to withstand the pressure of the rapid combustion reaction which would normally result in an explosion, except for the fact that there is a small opening through which all the rapidly expanded gases can escape to product the thrust of the engine. For more information on the chemistry of model rocketry, see Rohrig, B. Model RocketsChemistry for Liftoff. ChemMatters. April, 2001, pp 13-15, available on the 25-year ChemMatters CD. (See the References section for information about obtaining the CD.) More on natural explosions Man isnt the only species that creates explosions. The bombardier beetle creates two simultaneous chemical reactions that produce gas and heat quickly and in large quantities. The two reactions involve the following chemicals stored in two pouches on the beetle: a) hydroquinone and methylhydroquinone and hydrogen peroxide, and b) the enzymes catalase and peroxidase. The hydroquinone compounds react with hydrogen peroxide to produce quinones and water, and the hydrogen peroxide decomposes to produce oxygen and water. Both these reactions are very slow under normal conditions. The enzymes, however, greatly speed up these reactions. So when the beetle mixes the contents of the two pouches, the resulting reaction produces copious volumes of gases (oxygen and water). Add to this the fact that these reactions are exothermic, and one finds that the water produced gets so hot that it boils, increasing its volume and also heating the oxygen gas, causing a large increase in pressure inside the reaction chamber. The result is an audible pop and an explosion of liquid spray that deters predators. You can read more about the reactions on page 9 of the October, 1993 issue of ChemMatters. The article is available on the 25-year ChemMatters CD. (See the References section, below, for information about hot to obtain the CD.) More on gas laws Most combustion reactions begin with a fuel that is composed of large molecules. (Think gasoline, C8H18, or paraffin, C22H46.) The products of combustion reactions are typically CO2 and H2O, or other similarly small molecules. This means that more molecules are produced than are consumed in combustion reactions. This results in the products occupying more volume than the reactants. As has been discussed in the More on fireworks section, gases are produced when a typical combustion reaction occurs. The increase in moles of gas results in huge increases in the volume of the system. These increases are on the order of 2000 times as much volume or pressure. We might apply Avogadros hypothesis here to explain the situation: if equal volumes of gases contain equal numbers of molecules, then greater numbers of molecules will result in greater volumes of gases. Since a gas typically occupies approximately 2000 times as much as its solid or liquid counterpart, this is one source of the great increase in volume in a combustion reaction. Recall that combustion reactions are highly exothermic. This intense temperature increase results in molecules moving much faster, causing even greater volume increases in the gases produced in the reaction. This is a direct application of Charles Law; as temperature increases, volume of a gas increases proportionally. But now recall that in an explosion, there must be a rigid, closed container. And within that container the combustion reaction is occurring. So, instead of all that volume of gas just escaping into the atmosphere, all the gas molecules are trapped inside the container. More molecules produced in the reaction than consumed, more gases after the reaction than before, and higher temperatures resulting in faster moving moleculesall these factors result in increased pressures inside the container, until finally the pressure is so great that the container cannot contain it and the explosion results. The increase in pressure that results from the intense heating of the gas inside the container is a direct application of Amontons Law, which states that if volume and amount are held constant, the pressure inside a closed system is directly related to the temperature of the gas molecules. More on reaction kinetics Rapid combustion reactions generally involve flammable liquids and gases. The liquid must be in the vapor state in order to have enough surface area to react rapidly with gaseous oxygen in the air. This means it must have a fairly high vapor pressure, to ensure vaporization/evaporation of the liquid. Even slower combustion reactions with liquids rely on the existence of vapors to burn. For example, paraffin in a candle is a solid. Lighting a match to a candle wick melts the solid wax to a liquid. The liquid is then drawn up the wick by capillary action to the top, where the heat from the match (and then from the burning of the candle wax itself) causes it to vaporize. The paraffin vapors then are ignited and continue the burning process. Liquid gasoline only burns on the surface, where the vapors can interact with oxygen from the air. Of course, since gasoline has a high vapor pressure, lots of gasoline vapors escape the surface of the liquid, resulting in intense heat from the rapid combustion process. If a flammable solid is involved in a rapid combustion reaction (or explosion), the solid must be in a very fine particulate state. This is true because the solid must have a very large surface area, with which oxygen molecules can interact very rapidly. Dusts and powders dispersed into the air are explosions waiting to happen. Particle size plays a large role in solid rocket propellant. Model rockets use ammonium perchlorate, powdered aluminum and flammable synthetic polymers. The ammonium perchlorate is usually ground to a very fine powder, about 2 m (2 x 10-6) in diameter, while the aluminum is generally ground to about 5-60 m in diameter. (Note that both of these are much smaller sizes than the average size of powdered sugar particles, given in the article. You might want to discuss with students the problems these would present in the case of a fire in the manufacturing plant.) The size of the particles affects the rate of combustion. If particle sizes are too large, the reaction would take place too slowly and would not produce enough heat to give adequate thrust. If particle sizes are too small, the reaction would be too rapid and the engine might blow apart before the product gases could escape the engine. Rohrig, B. Model RocketsChemistry for Liftoff. ChemMatters. April, 2001, pp 13-15 If you are an ACS member, you can access a short paper on Kinetic model of a thermal explosion at its J Chem Ed web page,  HYPERLINK "http://pubs.acs.org/doi/abs/10.1021/ed051p457" http://pubs.acs.org/doi/abs/10.1021/ed051p457. The article describes a very simple mathematical model to describe the existence of an induction period prior to a sudden rapid temperature rise involved with a simple explosive reaction inside a closed reaction chamber. Although the math is probably beyond student use, the resulting graph shows that temperature inside such a reaction vessel does not increase regularly during the early stages of the reaction, but rather stays somewhat steady until a critical point, when the temperature of the reaction suddenly takes off. Although this ChemMatters article does not deal with the kinetics of explosive reactions, it would be useful for students to see that the chemical equation representing combustion of sucrose given in the article is not the mechanism by which the reaction occurs, explosively at explosive conditions. The kinetics of the reaction are way beyond a first year chemistry course, but you might be able to give students a hint of how complex the mechanisms might be by looking at portions of a video dealing with Combustion Chemistry Kinetics Podcast 7.1: Hydrogen Mechanism, at  HYPERLINK "http://www.youtube.com/watch?v=kYLbvR6osDI&feature=related" http://www.youtube.com/watch?v=kYLbvR6osDI&feature=related. Here, Professor Edward Blurock presents the mechanism by which hydrogen gas undergoes combustion and possibly explosion. He shows the myriad intermediates present as hydrogen burns in air. He describes initiation, chain reaction and chain terminating steps in the overall reaction. The podcast is a college-level presentation, so students wont understand much of the video, but selective viewing can give them a basic idea of the complexity of combustion. Another segment of the series of podcasts deals with Methane Mechanism, at  HYPERLINK "http://www.youtube.com/watch?v=mjXHlz2BOZI&feature=related" http://www.youtube.com/watch?v=mjXHlz2BOZI&feature=related. If the topic is intriguing to you, there are many more segments of Dr. Blurocks course in Combustion Chemistry Kinetics available on YouTube. More on dust explosions You are probably familiar with the standard fire trianglelike the one at the rightused by fire departments and other groups to show the relationship between the fuel, oxygen from the air, and a heat source. A fire needs all three of the factors shown in the triangle in order to start. It is also a good way to train people to put out fires; simply (or not so simply) remove one of the three sides of the triangle and the fire dies out.  INCLUDEPICTURE "http://www.ohiou.edu/ehs/images/fire/firetri.gif" \* MERGEFORMATINET   HYPERLINK "http://www.ohio.edu/ehs/fire/extinguisher/triangle.htm" http://www.ohio.edu/ehs/fire/extinguisher/triangle.htm OSHA has created a similar diagram for a dust explosion:  INCLUDEPICTURE "http://www.osha.gov/dts/shib/shib073105_3.gif" \* MERGEFORMATINET  This diagram adds to the fire triangle the dispersion of the dust particles and the confinement of the dust cloud. Inside the confinement, the dust can burn very rapidly and may explode. The typical mechanism of a dust explosion, already explained in the More on the Imperial Sugar Company plant accident, above, is shown in Figure 2, below. A primary explosion occurs in a processing area where dust has accumulated and has been dispersed throughout a containment vessel or building. (An ignition source is also needed, of course.) The shockwave from this explosion damages a nearby containment system, such as a duct or collector, releasing a large cloud of dust accumulated in that vessel, which then immediately ignites from the flames of the first explosion. Secondary explosions can be far more damaging than the primary explosion due to the large quantities of dust stirred up by the original blast.  INCLUDEPICTURE "http://www.osha.gov/dts/shib/shib073105_04.gif" \* MERGEFORMATINET  Unlike normal fires, a dust explosion cannot easily (if at all) be stopped. But they can be prevented, just like fires can be prevented, by removing one side of the pentagon (triangle, in the case of a fire). The fuel and the oxygen in the air are impossible to eliminate from the pentagon, but OSHA has issued regulations to help control to a significant extent the other sides of the dust explosion pentagon. (Source:  HYPERLINK "http://www.osha.gov/dts/shib/shib073105.html" http://www.osha.gov/dts/shib/shib073105.html) More on other dust explosions Grain explosions Dust explosions have been around since man began playing with fire. Farmers have experienced dust explosions in their grain silos on a regular basis ever since they began storing grain. When the grain is elevated outside the silo to the top of the silo and allowed to fall to the bottom, large amounts of dust are raised in the process, as the grain hits the bottom. This dust fills the enclosed silo and makes a perfect set of conditions for a dust explosion: enclosed system, a high concentration of very finely divided particles of flammable material to interact with oxygen in the air, and typically, dry conditions that are conducive to burning. The only thing missing is activation energy. This can be obtained from a spark from machinery, lightning, or a very badly placed match or cigarette. As farms grew, so did the size of their silos. Today, farmers in cooperatives pool their produce and store it in larger facilities, including silos. As the size of the silo grows, the height increases, meaning the grain drops from a greater height, producing even more dust when it hits the bottom of the silo. More dust means greater chance of explosionand greater force of explosion. Mine explosions The same potentially explosive scenario can exist inside a mine, especially a coal mine. The gigantic machinery at work in the mine grinds up the coal into small enough pieces to remove from the mine in rail cars. The grinding also produces large amounts of coal dust. Once again, we have a potentially explosive situation: enclosed system (the cavern or mine), very fine, flammable coal dust, oxygen in the air, and possible sources of activation energy; e.g., cigarette, match, or spark from machinery or tools. The situation is ripe for an explosion. Such explosions happen relatively frequently. One particularly horrendous explosion happened in China in 1942. Tiny particles of coal dust suspended in oxygen-rich air can be another potential disaster just waiting for a spark. On April 26, 1942, 1549 people were killed by a coal-dust explosion at Honkeiko (Benxihu) Colliery, China. That was the worst single coal-mining disaster in history, according the Guinness Book of World Records. Today, coal dust continues to pose serious risks in China and elsewhere. In May of 2002, 18 miners were killed in an explosion at a coal mine in Wentang Township in Chinas southern Hunan province. Black, H. Coal Mine Safety. ChemMatters, February, 2004, 22 (1), pp 17-19. But not every coal mine explosion is due to the combustion of coal dust. Pockets of methane gas are frequently discovered (or more correctly, uncovered) in mine shafts. Since methane is a gas, it is already finely dividedas individual gas moleculesand is therefore extremely reactive with oxygen gas. If the concentration of methane builds up in a mine shaft, it is ripe for an explosive situation. Again, all it needs is a spark or flame to set it off. Methane gas explosions in coal mines are far more frequent occurrences than coal dust explosions. Food industry explosions In addition to powdered sugar explosions, other examples of explosive dusts in the food industry include flour, dried milk, potato powder, soup powder and instant coffee. (Imagine what a coffee explosion would smell like.) Typical concentrations that can result in explosions are very low, ranging from 75 >1000 g/m3 of air. In concentrations such as these, it is difficult to distinguish solid shapes at distances of less than 1 m. Britains Health and Safety Executive, HSE, which is an organization similar to OSHA, inspects factories and other workplaces throughout Great Britain. They have regulations in place that protect workers in the food industry from dust explosions, and they inspect these facilities on a regular basis. You can find more information at  HYPERLINK "http://www.hse.gov.uk/food/dustexplosion.htm" http://www.hse.gov.uk/food/dustexplosion.htm. In addition to all the ignition sources cited in the More on the Imperial Sugar Company accident section, above, just transporting powdered materials, especially pneumatically (blown through tubes), results in friction of the materials that can cause electrostatic charge to build up, sometimes resulting in sparks that auto-ignite the powder. Thus the chutes, conveyors, etc., must be grounded to prevent static buildup. Metal industry explosions On October 29, 2003, the Hayes Lammerz factory in Huntington, IN exploded. The plant made wheels for cars. Federal investigators concluded that the explosion involved aluminum dust built up at the plant. Even though a chunk of aluminum wont burn, when that same chunk of metal is ground up to a powder, the increased surface area puts it in the same category as the powdered sugar explosion; powdered metals are subject to dust explosions. An iron foundry in Springfield, MA exploded in 1999. Several people were severely injured in the explosion. The Fire Marshall attributed it to a dust explosion. An OSHA inspector had just inspected the plant, but he never had any training in the hazards of industrial dust accumulation. OSHA is working to change that. CBS TVs 60 Minutes had a show on June 8, 2008 about dust explosions: Is Enough Being Done to Stop Explosive Dust? You can view the video and see the transcript at  HYPERLINK "http://www.cbsnews.com/stories/2008/06/05/60minutes/main4157170.shtml" http://www.cbsnews.com/stories/2008/06/05/60minutes/main4157170.shtml. (The video included all aspects of dust explosions, not just metals exploding.) More on dust or powder Weve seen that dust or powder can be the fuel for serious fires and explosions. Coal and wood dust are prime examples of substances responsible for dust explosions. Both of these are very flammable. Even more innocuous substanceslike sugarcan burn and cause explosions. Yet not all powders serve as fuel for potential fires and explosions. Baking soda, NaHCO3, for example, is not flammable; indeed, it is used successfully as a fire extinguishing agent, especially in the case of kitchen grease fires. For this type of fire, water is not a good extinguishing agent. Water is usually successful as a fire extinguishing agent because a) it cools down the fire, perhaps lowering the temperature below the kindling temperature of the fuel, and b) it smothers the fire with a blanket of water, preventing oxygen from the air to get to the fuel, thereby extinguishing the flames. But water doesnt work on grease fires because a) the water is more dense than the grease or oil, and so it sinks under the grease, thus providing no barrier between the fuel and air, and b) the temperature of the grease is more than likely hot enough to instantaneously boil the water, thereby splattering the water and grease (and fire) all over the kitchen. The increase in surface area of all the smaller globules of burning grease allow air to get to each one more rapidly, resulting in a more rapid rate of combustion and the rapid spread of the flames. The recommended method of extinguishing grease fires in the kitchen is to smother it with a lid, if its a pan of burning grease. If that doesnt work, you are recommended to put baking soda on the fire. Even though baking soda is a powder, there is no danger that it will burn or explode because it is not a flammable powder. One must beware of using other (flammable) powders that may themselves ignite, adding to the problem. Examples are flour and (as we know) powdered sugar. Or, throw some baking soda into the pan. Thats baking sodanoncombustible. Dont use flour or powdered creamer, as both are flammable. Baking soda smothers flames by blocking oxygens access to the grease. Even better, baking soda is sodium bicarbonate (NaHCO3), which, when heated, releases carbon dioxide gas (NaHCO3 ( NaOH + CO2 (g)). Carbon dioxide is commonly used in fire extinguishers because of its failure to support combustion. Becker, R. Questions from the Classroom. ChemMatters. April, 2001, 19 (2), p 2. So there are several reasons for using baking soda to extinguish a grease fire: it smothers the flame by separating the fuel from oxygen in the air, and it decomposes at the high temperatures of a grease fire, and in the process of decomposing, produces carbon dioxide, which also helps to smother the fire by acting as a barrier between oxygen in the air, and the hot fuel. Connections to Chemistry Concepts (for correlation to course curriculum) Types of reactionsCombustion is the major emphasis of this article and is one of the five types of reactions included in a typical high school chemistry course. CombustionFuel, oxygen and kindling temperature are the basic ingredients of burning or combustion, and explosions occur as a result of rapid combustion reactions. Explosions Explosions are merely rapid combustion reactions that happen in an enclosed space where pressure can build up. Rates of reactionThe rate of a combustion reaction is determined by the amount of fuel, the size of the fuel particles and the availability of oxygen. Factors affecting the rate of reactionNature of reactants, physical state of reactants, temperature, pressure and surface area of reactants all affect the rate of reaction. Kinetic molecular theoryMolecular collisions cause bonds to break and new ones to form, resulting in chemical reactions. RespirationRespiration is a controlled combustion reaction. Gas lawsCharles law relates temperature and volume; Avogadros law relates amount and volume; and Amontons law (usually called, incorrectly, Gay-Lussacs law) relates temperature and pressure. The larger amount of gas produced in the combustion reaction (~2 times as much, 23 moles after compared to 12 moles before burning) creates an increase in the volume of the gases being produced in the confined space (Avogadros law) and this adds to the pressure. But the change from liquid or solid to gas accounts for a 200-fold increase in pressure, and the rising temperature of the gas as combustion occurs also adds to the pressureapproximately 8 times the temperature increase, from ~293 K to at least 2400 K in yellow flames (Amontons law), and this contributes even more to the pressure building, until the walls of the container can no longer withstand the pressure, and explosion results Thermodynamics/ThermochemistryExplosions are prime examples of heat production and the rate of heat production in chemical reactions. These reactions can be related to the relatively high heat content of the reactants compared to the much lower heat content of the products. Industrial chemistryStudents dont often get a chance in high school chemistry to see chemistry related to industrial plants. This would be a good time to discuss chemistrys central role in manufacturing all the goods students use/consume every day. SafetyThis might be a good opportunity to discuss safety in an industry (and a lab) setting. Possible Student Misconceptions (to aid teacher in addressing misconceptions) Sugar cant be a fuel; it doesnt burst into flames when you try to light it. This one is pretty well explained in the article. It doesnt burst into flames for several reasons: a) sugar is a solid, so it doesnt form vapors, like gasoline or molten candle wax, b) the particle size is too large (in granulated sugar) for easy lighting, and c) in a lump or pile of sugar, oxygen cant get to all of it to react. Sugar cant explode! Under normal conditions, it cant, but when it is ground up and pulverized and mixed in the air, in a closed container, a spark is enough to set it off. Explosions can occur anywhere you have fire. Explosions can only occur if the fire is in an enclosed space. Without the confinement, pressure cant build up and the products of combustion escape (relatively) harmlessly into the atmosphere. Combustion reactions and explosions are the same thing. This is wrong on several levels. Most combustion reactions are not explosions. As has been stated earlier, explosions require a closed system to allow pressure to build up; therefore, any open flame is combustion, but it is not an explosion. Many explosions do not involve combustion. TNT, for example, is a decomposition reaction, but it is not combustionthe reaction does not require oxygen. Anticipating Student Questions (answers to questions students might ask in class) Why doesnt our body catch on fire, if we burn sugar? The article mentions that the biochemical reactions involving the slow combustion of sugars inside cells involve many steps of generating and recapturing energy, thus avoiding the concentrated evolution of energy in any one reaction. Why arent there many more large-scale dust explosions, especially involving more flammable materials? As the article points out, there have been many industrial dust explosions in the recent past. Only strict adherence to stringent regulations concerning dust production and accumulation will prevent these explosions in the future. OSHA has also begun stricter enforcement of its national program concerning minimization of dust in industrial settings. Do dust explosions ever happen in situations other than the typical industrial setting? Yes, agricultural dust explosions are relatively frequent events. (See More on other dust explosions, above.) Coal mines are another venue for possible (coal) dust explosions, although methane explosions are probably more common in coal mines. Can fireworks be considered dust explosions? Yessee More on fireworks explosions (and rockets), in the Background Information section, above. In-class Activities (lesson ideas, including labs & demonstrations) Baking soda and vinegar explosion.Fill a film canister about 1/3 full with vinegar. Add a spatula tip full of baking soda and quickly cap the canister. Stand back and watch while the build-up of CO2 gas inside the canister makes the lid pop off and fly into the air. The reaction between sodium bicarbonate and acetic acid isnt normally considered explosive. The production of CO2 gas isnt normally rapid enough, and it must be contained in a film canister to allow enough pressure for an explosion to build up. Even so, this simple activity demonstrates important aspects of an explosive reaction: the rapid production of gases and the need for a closed system. Notice that this explosion occurred without any combustion at all! In the interest of safety, make sure students are several feet away from the film canister. (Teachers Guide, ChemMatters, April, 2008, available on the online at  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters. There are several demonstrations you can use to show the effect of varying the surface area of the reactant to vary the rate of the reaction. One reaction you can use is showing the reaction involved in sparklers by dropping iron filings onto a lit Bunsen burner. The iron filings will spark and glow. If you do the same demonstration with a very tiny bit of iron powder (Be very careful!), the powder will burst into flames. A student lab activity that you can use in place of this demonstration involves students observing the reaction of steel wool and vinegar to show slow combustion (corrosion) of the iron, and then students try to light an iron nail, a small portion of steel wool, and then a tiny bit of iron filings, in a flame, to show the effect of changing the surface area of the substance to affect its reaction rate. The activity, called Burning Iron, can be found in the April 1997 issue of the Classroom Guide for ChemMatters. This activity is available on the 25-year ChemMatters CD. For more information about how to obtain the CD, see the Reference section below. Another demonstration for surface area is the old, tried-and-true lycopodium powder reaction. Try to burn a small pile of lycopodium powder with a match or a Bunsen burner. The particles along the edges or the top surface may char slightly and you will get the tell-tale smell of lycopodium powder burning, but you wont get a flame (only surface molecules can react with air molecules). Now try the same demonstration by blowing a small bit of the lycopodium powder from a paper onto the flame, and the entire burst of powder will become engulfed in flame (the powder mixes with the air, providing a large increase in surface area of powder exposed to air. This is a prime example of how dust explosions can happen (although your demonstration was not contained, so no pressure built up and hence, no explosion. CAUTION! Some students are allergic to lycopodium powder and its reaction products. You might also want to try flour as the fuel, but its not quite as exciting as lycopodium powder. If youd rather not expose students to the potential danger of the lycopodium powder, you can find still photos of these effects, as well as video clips of the reactions at  HYPERLINK "http://www.angelo.edu/faculty/kboudrea/demos/lycopodium/lycopodium.htm" http://www.angelo.edu/faculty/kboudrea/demos/lycopodium/lycopodium.htm. Whether you actually do the demonstration, or just show the video, you should admonish students not to try this at home. YouTube also has a video clip of this demonstration by Steve Spangler, of Steve Spangler Science. He does a good of explaining the process, and he shows very slow motion of the reaction. View it at  HYPERLINK "http://www.youtube.com/watch?v=TAdElO1FCSM&feature=player_embedded" http://www.youtube.com/watch?v=TAdElO1FCSM&feature=player_embedded or  HYPERLINK "http://wn.com/Lycopodium_Explosion_Grain_Elevator_Explosion" http://wn.com/Lycopodium_Explosion_Grain_Elevator_Explosion. (This video does not appear to be on the Steve Spangler Science web site.) You may want to follow up on the lycopodium powder burning with the lycopodium powder explosion demonstration made famous by Hubert Alyea of Princeton University fame. He designed a can with a pressure-fitting lid (a 1-gallon paint can) that contained a small amount of lycopodium powder in a funnel inside the can that was attached to a piece of rubber tubing fitted through a hole in the can, leading in from the outside. The can also contained a small lit candle. Upon blowing air into the rubber tubing leading into the funnel inside the can, the lycopodium powder was blown up into the air and mixed thoroughly with it inside the can, forming a concentrated enough mixture to ignite (from the candle flame) and explode, blowing the lid off the can. You can find a description of the apparatus, as well as a diagram of same at  HYPERLINK "http://www.iomosaic.com/iomosaic/pdf/o2-crit.pdf" http://www.iomosaic.com/iomosaic/pdf/o2-crit.pdf. Again, note the caution remark in #2 above. And if you just want to watch the reaction, view it at  HYPERLINK "http://www.teachersdomain.org/resource/lsps07.sci.phys.matter.expldust/" http://www.teachersdomain.org/resource/lsps07.sci.phys.matter.expldust/. The page is titled Dust Explosion and its purpose is to demonstrate how grain elevator explosions happen. There are two video clips here: the first shows the exploding can as described in the pdf file, and the second one shows the same apparatus, but using a transparent acrylic container, so students can see the explosion in real time (and also a slow-motion instant replay). The videos are from Teachers Domain, and you can view up to seven items on the site as a trial, but then you must register to continue using materials on the site. The registration is free. The videos on this page are also downloadable. (Downloading files requires registration.) You can also view the same first video, with the metal can explosion, at its source, JCE Software,  HYPERLINK "http://jchemed.chem.wisc.edu/JCESoft/CCA/samples/cca7dust1.html" http://jchemed.chem.wisc.edu/JCESoft/CCA/samples/cca7dust1.html. In discussing factors affecting rates of reaction, the nature of the reactants is one of those factors. You probably note to students that solid-solid reactions are rare and usually very slowon the order of geologic time frames. But there is one solid-solid reaction that is very rapid and very exothermic. The thermite reaction was used by the railroad companies to weld their iron rails together. Thermite is a mixture of aluminum and iron(III) oxide and produces aluminum oxide and iron according to the equation Fe2O3 + 2Al ! 2Fe + Al2O3 + heat. The thermite reaction is highly exothermic and potentially dangerous, so if you decide to try it as a demonstration for your students, be sure you have practiced it before doing it before a class. And keep the class a safe distance from the reaction, wearing safety goggles. Or show the video:  HYPERLINK "http://www.ilpi.com/genchem/demo/thermite/index.html" http://www.ilpi.com/genchem/demo/thermite/index.html. Before you get to the demonstration, the directions, along with all safety precautions are listed for you, along with still photos of the equipment used in the demonstration. The video is off to the right, almost all the way down to the bottom of the page. Note that the aluminum and iron(III) oxide reactants used in this demonstration are powdered (sound familiar?). Thermite is used commercially by railroad companies to weld together rails at their juncture. You can show the first part of this video clip, which shows the process being used on a modern rail line in Switzerland:  HYPERLINK "http://www.youtube.com/watch?v=vCqG3rWtNbc&NR=1" http://www.youtube.com/watch?v=vCqG3rWtNbc&NR=1. This one shows the same thing, done manually on a SEPTA (Southeastern Pennsylvania Transportation Authority) rail in 2007:  HYPERLINK "http://www.youtube.com/watch?v=nR6K90cR8Lg&feature=related" http://www.youtube.com/watch?v=nR6K90cR8Lg&feature=related. A more controlled variety of the thermite reaction can be demonstrated using spheres of rusted iron (old, rusted shot-puts or grinding mill ball bearings, for example) and aluminum foil. Wrap one rusted ball in aluminum foil, and strike another rusted steel/iron ball against the one coated with aluminum foil. Sparks will shoot off the aluminum-clad ball, caused by the reaction described above, only at a controlled rate. View Steve Spanglers demonstration at  HYPERLINK "http://www.youtube.com/watch?v=O5v3XxFfUOw" http://www.youtube.com/watch?v=O5v3XxFfUOw. More sparks can be seen at this YouTube video site:  HYPERLINK "http://www.youtube.com/watch?v=vCqG3rWtNbc&NR=1" http://www.youtube.com/watch?v=vCqG3rWtNbc&NR=1. The Classroom Guide that accompanied the February, 2003 issue of ChemMatters contained this problem: You might want students to compare the following: (1) the amount of expansion that occurs during an explosion because of the production of gaseous products from solid or liquid reactants, and (2) the amount of expansion that occurs because the gaseous products are heated to a much higher temperature. Nitroglycerin is used as an example reaction. You might want to use it as part of a class discussion of combustion reactions and explosions. The detailed answer to the question is offered in the same issue, reprinted here: NOTE: Two solutions are presented. The first is just the bare bones solution for those only interested in double-checking their own solution to the problem. The second is a detailed explanation of the reasoning behind the calculations, for anyone who might be interested in or would benefit from these kinds of extended explanations. Significant figures will not be meticulously observed in either solution. Bare Bones Solution The balanced equation for the decomposition of nitroglycerin is: 4 C3H5N3O9(l) ( 6 N2(g) + 12 CO2(g) + 10 H2O(g) + O2(g) Volume of liquid reactant is insignificant and can be neglected. Volume of 29 moles of products at 25 oC is: (29 moles) (22.414 L/mol) (298/273) = 710 L Volume of 29 moles of products at 3000 oC is: (710 L) (3273/298) = 7800 L Conclusion: Volume increase due to creation of gaseous products is only about 710 L, while the volume increase due to the heating of these products is about 7800 L 710 L, or about 7090 L. Detailed Solution The balanced equation for the decomposition of nitroglycerin is: 4 C3H5N3O9(l) ( 6 N2(g) + 12 CO2(g) + 10 H2O(g) + O2(g) The equation shows that four moles of liquid nitroglycerin are converted into a total of 29 moles of gaseous products (six of nitrogen, twelve of carbon dioxide, ten of gaseous water, and one of oxygen). We can safely assume that the volume of the initial four moles of nitroglycerin can be neglected, since the volume occupied by liquids is so much smaller than the volume occupied by comparable amounts of gases (liquids are much denser than gases at room conditions of temperature and pressure). If you care to actually worry about the volume occupied by the initial liquid nitroglycerin: The density of liquid nitroglycerin is 1.583 g/mL. Since the molar mass is: 3(12) + 5(1) + 3(14) + 9(12) = 227 g/mol the mass of four moles is 4 (227) = 908 g and the volume occupied by the initial four moles is: 908 g/(1.583 g/mL) = 574 mL Since no pressure was given in the problem but room conditions are implied, it is reasonable to assume that atmospheric pressure is about 1 atmosphere. At STP one mole of any gas occupies a volume of about 22.414 liters. At 1 atmosphere and a temperature of 25 oC the volume occupied by one mole of an ideal gas would be: (22.414 L) (298/273) = 24.467 L This is arrived at because Charles Law states that the volume occupied by a gas is directly proportional to its Kelvin temperature. To convert oC to K, you just add 273 (273.15 if you want to split hairs) to the Celsius temperature. So the volume occupied by the 29 moles of gaseous products if their temperature remained at 25 oC would be: (29 mol) (24.467 L/mol) = 709.54 L So when the initial four moles of liquid nitroglycerin are transformed into the 29 moles of gaseous products, the volume increase that can be attributed to the transformation is about 709.54 L, if we neglect the initial volume of the reactant. If you really wanted to worry about the initial volume of the liquid nitroglycerin, 574 mL or 0.574 L, the more technically correct answer would be 709.54 L 0.574 L, or about 708.97 L. The volume of the 29 moles of gaseous products when their temperature rises to 3000 oC, or 3273 K is: (709.54 L) (3273/298) = 7793 L So, to summarize: The volume increase attributed to the fact that 29 moles of gaseous products are produced from 4 moles of liquid reactant is about 710 L (rounding off the 709.54 L). The volume increase attributed to the fact that the temperature of the products increases from 25 oC to 3000 oC is about 7793 L 710 L, or about 7083 L. Clearly the volume increase brought about because the temperature rose so dramatically is far more significant than the volume increase that occurs because a liquid reactant is converted into a gaseous product. Although it is not a dust explosion, you can show an explosive reaction by demonstrating to students the methane can explosion. There are many variations of the demonstration, but the one on the Doing Chemistry Web site has a very good teacher version of the entire event. It could be used as a lesson plan, complete with the description of the preparation of the apparatus, questions to ask during or after the demonstration and safety precautions needed. There is a video of the preparation of the can, and of the actual reaction as it proceeds. The video can be used to show the demonstration to absent students after they return to class. The entire package can be found at  HYPERLINK "http://dwb4.unl.edu/chemistry/dochem/DoChem049.html" http://dwb4.unl.edu/chemistry/dochem/DoChem049.html. Perhaps a better video of the reaction can be viewed here:  HYPERLINK "http://www.youtube.com/watch?v=MhD5pZ5sZb4" http://www.youtube.com/watch?v=MhD5pZ5sZb4. You can relate the explosion of the methane in the can to a natural gas explosion in a home. As the methane leaks out of a pipe, its concentration continues to increase until it reaches an explosive mixture with the air, at which time any ignition source can detonate the atmosphere in the home. The exploding can of hydrogen gas is similar to the methane can above. You can see Robert Auses version of this activity, complete with suggested questions for students at  HYPERLINK "http://www.scribd.com/doc/18946589/Blast-Off-Demo-for-Chemistry" http://www.scribd.com/doc/18946589/Blast-Off-Demo-for-Chemistry. The author relates this explosion to the burning of the Hindenburg in a class discussion. Steve Spangler does a version of this on a local TV news station that you can view at  HYPERLINK "http://www.stevespanglerscience.com/experiment/exploding-pringles-can" http://www.stevespanglerscience.com/experiment/exploding-pringles-can. The Molecular Workbench web site by the Concord Consortium provides computer simulations at the molecular level (and sub-molecular level) of many phenomena in chemistry. One of these simulations involves a chemical reaction which may, or may not, lead to an explosion, depending on conditions the student chooses. When an explosion does occur, the student can see via a graph of molecular energies, precisely when the reaction became explosive. Your computer needs the Java applet to run the simulations. The Molecular Workbench homepage is here:  HYPERLINK "http://mw.concord.org/modeler/index.html" http://mw.concord.org/modeler/index.html. On their home page, click on the Showcase tab at the top left, next to the Home tab. When you get to the next screen, with a geodesic dome in the background, click on the Chemistry block. This will take you to a list of major chemistry topics with names of individual simulations below the topic. Under Reactions at the bottom of the screen, click on Explosion. It will take a bit of time for the Java applet to load. This takes you to a screen where you can access several tabs at the top: Explosion, No explosion, Heat can cause explosion, Explosion can do work, and Free play. Each of these is a separate simulation allowing you to learn about what constitutes an explosion at the molecular level. You could easily generate a lesson about explosions from this series of simulations. If Molecular Workbench intrigues you, check out MOLO, Molecular Logic (another Concord Consortium project), at  HYPERLINK "http://molo.concord.org/database/" http://molo.concord.org/database/. It contains 175 model-based activities, supposedly for biology students, but there are a lot of chemistry simulations there as well, including Explosions. Out-of-class Activities and Projects (student research, class projects) Students can research past stories of industrial, mining and agricultural dust explosions and report to the class. Reports should include hypothesized causes and, where possible, the effects of the explosion, on the company, the workers, the community and the chemical industry. Students can research OSHAs progress in establishing a set of standards to minimize dust explosions in industrial settings. Several reports and accounts of the Imperial Sugar Companys explosion are available online. Students might want to research these and report their findings to their classmates. They could begin their research with the Chemical Safety Boards research findings here:  HYPERLINK "http://www.csb.gov/investigations/detail.aspx?SID=6&Type=2&pg=1&F_All=y" http://www.csb.gov/investigations/detail.aspx?SID=6&Type=2&pg=1&F_All=y. This site contains a 9-minute video that details the accident and the results of the CSBs investigation ( HYPERLINK "http://www.csb.gov/investigations/detail.aspx?SID=6" http://www.csb.gov/investigations/detail.aspx?SID=6). You might want students to research the effects OSHAs new standards on reducing dust in the workplace are having on various industries References (non-Web-based information sources)  Black, H. Coal Mine Safety. ChemMatters, February, 2004, 22 (1), pp 17-19. The author briefly discusses the role coal dust plays in coal mine explosions. In addition to being available on the 25-year ChemMatters CD, this article can also be found online in the ChemMatters archives at  HYPERLINK "http://portal.acs.org/portal/PublicWebSite/education/resources/highschool/chemmatters/CTP_005370" http://portal.acs.org/portal/PublicWebSite/education/resources/highschool/chemmatters/CTP_005370. Mentzer, R. MysteryMatters: Fire in the Hold. ChemMatters, April, 1997, 15 (2), pp 11-13. Although the article does involve a small explosion on a ship, it focuses primarily on the rate of reaction of the unwanted (and unexpected) combustion of iron in the hold of the ship. Surface area plays a large role in the event. Young, J. A. MysteryMatters: Non-Safety Glass. ChemMatters, October, 1987, 5 (3), pp 10-11. The author describes the explosion of a can of alcohol due to the burning of the vapors (rather than the liquid). Rowell, C. MysteryMatters: Flash Point!. ChemMatters, December, 1986, 4 (4), pp 10-11. The article involves an explosion as welders worked on a railroad tank car carrying No. 6 fuel oil, that was well known to be of little hazard to welders. The discussion centers on the idea of flash point and the burning of the oils vapors, rather than the liquid oils burning. ____________________ Brown, G. I. The Big Bang: The History of Explosives. Sutton Publishing, 2000. Web Sites for Additional Information (Web-based information sources) More sites on explosions Wikipedias web site contains a great deal of information about explosive materials. You can find the details at  HYPERLINK "http://www.wikipedia.org/wiki/Explosive" http://www.wikipedia.org/wiki/Explosive. More sites on dust explosions OSHAs Bulletin, Combustible Dust in Industry: Preventing and Mitigating the Effects of Fire and Explosions, can be found here:  HYPERLINK "http://www.osha.gov/dts/shib/shib073105.html" http://www.osha.gov/dts/shib/shib073105.html. A report at  HYPERLINK "http://www.aristatek.com/Newsletter/APR08/TechSpeak.pdf" http://www.aristatek.com/Newsletter/APR08/TechSpeak.pdf reviews a bit of the CSB report regarding Imperial Sugar, and then discusses types of dust explosions and their breakdown by industry and by product. It also further explains the fire triangle/dust explosion pentagon diagrams, as well as physical properties of combustible dusts. For more information on Britains Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR), see  HYPERLINK "http://www.hse.gov.uk/fireandexplosion/dsear.htm" http://www.hse.gov.uk/fireandexplosion/dsear.htm. OSHA has issued a bulletin, one of their OSHA Fact Sheets (3/2008), Hazard Alert: Combustible Dust Explosions, at  HYPERLINK "http://www.osha.gov/OshDoc/data_General_Facts/OSHAcombustibledust.pdf" http://www.osha.gov/OshDoc/data_General_Facts/OSHAcombustibledust.pdf. James Maness of JEM Safety Consulting, wrote a paper on Grain Industrys Approach to Dust Explosions. He shows a graph of grain dust explosions from 1976 to 2005. He lists at least 10 ways the industry is trying to reduce the number of dust explosions, and gives detailed information about how dust explosions start. You can find his article at  HYPERLINK "http://www.nfpa.org/assets/files//PDF/Foundation%20proceedings/Jim_Maness.pdf" http://www.nfpa.org/assets/files//PDF/Foundation%20proceedings/Jim_Maness.pdf. More sites on the Imperial Sugar Company explosion A short news article on the Imperial Sugar Company explosion the day after the explosion can be found at NewsInferno,  HYPERLINK "http://www.newsinferno.com/archives/2539" http://www.newsinferno.com/archives/2539. A very detailed 10-minute video from the Chemical Safety Board shows the aftereffects of the Imperial Sugar Company explosion, as well as the results of the CSB investigation of the causes of the catastrophe. It shows an animation of the entire situation. The Savannah Morning News savannahnow Web site has a section on the Imperial Sugar explosion, including a series of videos of the aftermath and rebirth of the packaging/processing plant at  HYPERLINK "http://savannahnow.com/news/explosion" http://savannahnow.com/news/explosion. More sites on gas laws If students need a refresher on the history of the various gas laws, they can find it at Thalls History of Gas Laws, at  HYPERLINK "http://web.fccj.org/~ethall/gaslaw/gaslaw.htm" http://web.fccj.org/~ethall/gaslaw/gaslaw.htm. More sites on reaction kinetics The Molecular Workbench has several databases of activities online. One of them deals with a molecular simulation of the effect of the presence of a free radical on the reaction rate. You can find it at  HYPERLINK "http://molo.concord.org/database/activities/134.html" http://molo.concord.org/database/activities/134.html. Another simulation from the Molecular Workbench simulates the effect of an increase in concentration on reaction rate:  HYPERLINK "http://molo.concord.org/database/activities/56.html" http://molo.concord.org/database/activities/56.html. And yet another Molecular Workbench simulation simulates the effect of an increase in temperature on reaction rate:  HYPERLINK "http://molo.concord.org/database/activities/58.html" http://molo.concord.org/database/activities/58.html. Myths: Chemistry Tells the Truth Background Information (teacher information) More on the MythBusters television show The myth-based subjects and certain language used (Is the myth busted?) in the Rohrig article are reminiscent of the television program MythBusters. The program began airing in 2003, with shows still currently in production on the Discovery Channel. The premise of the program is that each episode investigates one or more myths, testing through experimentation as to whether the myth can be labeled as busted, or not true; plausible, in that the myth might be true, but was not confirmed through experimentation; or confirmed, in that what is described in the myth actually could and/or does happen. The program is often cited as an example of the scientific method, in that each show involves identifying a potential myth, forming a hypothesis about the myth, designing an experiment to test the hypothesis, and making a conclusion about the myth. To describe an example, the first pilot episode of the program included an investigation of a myth involving Pop Rocks. An episode guide on the Discovery Channel Web site ( HYPERLINK "http://dsc.discovery.com/fansites/mythbusters/episode/00to49/episode_11.html" http://dsc.discovery.com/fansites/mythbusters/episode/00to49/episode_11.html) reads: The Pop Rocks and soda legend concerns a boy known as little Mikey, who was featured in commercials for Life cereal. Some years later, Mikey was challenged by his friends to eat six packs of Pop Rocks candy with six cans of soda. According to the myth, the carbon dioxide in the candy combined with the carbon dioxide in the soda to create so much pressure that Mikey's stomach exploded and he died. The MythBusters team investigated the myth that the described combination of six packs of Pop Rocks candy with six cans of soda makes a human stomach explode. To test the myth, the team used a pig stomach, which they determined is approximately the size of a human stomach. They added hydrochloric acid to the stomach to mimic the acidity of a human stomach. When they put the Pop Rocks in the stomach, then added six cans of soda, the stomach stretched out, but did not explode. A pressure gauge attached to the stomach did not register a noticeable pressure gain. The teams conclusion was that the myth was busted. This episode can be seen as part of the Discovery Channels DVD set MythBustersCollection 3, and is part of the episode Jet-Assisted Chevy. Some of the myths investigated on the show relate to chemistry. Several of these are highlighted on an American Chemical Society ChemClub Activity of the Month update featuring MythBusters ( HYPERLINK "http://portal.acs.org:80/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN&node_id=350&content_id=CNBP_024736&use_sec=true&sec_url_var=region1&__uuid=3f1bc240-e9ee-479e-b5f1-2f8b17de98da" http://portal.acs.org:80/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN&node_id=350&content_id=CNBP_024736&use_sec=true&sec_url_var=region1&__uuid=3f1bc240-e9ee-479e-b5f1-2f8b17de98da). The ChemClub update connects each of the myths mentioned with a common chemistry demonstration and provides links to each episode description, along with a video clip. These include: Episode #57, 2006: Diet Coke and Mentos. Question: Why does dropping Mentos into a bottle of Diet Coke create a geyser effect? The effect had no myth associated with it, and instead involved an investigation of what causes the geyser effect. Episode #78, 2007: Walking on Water. Myth statement: Ninjas had the ability to run across water. The MythBusters team made a large amount of a water and cornstarch mixture. The non-Newtonian fluid properties of the mixture allowed a person to run across a huge container of the mixture. Episode #100, 2008: Sodium Jailbreak. Myth statement: A person can blow a man-sized hole in a wall with one gram of sodium reacting with water. Episode #121, 2009: Thermite vs. Ice. Myth statement: Igniting a bucket full of thermite on top of a bunch of blocks of ice will cause an explosion. Episode #129, 2009: Liquid Nitrogen Myths. Myth statements: A human head dipped into liquid nitrogen for five seconds can be shattered into pieces (based on a scene from the movie Jason X). A fresh Christmas tree doused with liquid nitrogen can spontaneously explode. Episode #133, 2009: Antacid Jail Break. Myth statement: By mixing enough antacid tablets with water, a prisoner can generate enough carbon dioxide to blow his cell apart. More on microwaves Rohrigs article describes the 1940s, military-based history of the microwave oven and states that the appliance is now present in more than 90% of U.S. homes. A 2001 residential energy consumption survey performed by the U.S. Energy Information Administration ( HYPERLINK "http://www.eia.doe.gov/emeu/recs/appliances/appliances.html" http://www.eia.doe.gov/emeu/recs/appliances/appliances.html) reported that 75 to 93 percent of households in the U.S. had a microwave, with the percentage increasing as household income increases from below $15,000, to $75,000 and above. These statistics confirm that a microwave oven is a common, real-world object that a majority of students can easily relate to, and have likely heard other myths about the appliances operation and use. The Raytheon Corporation had already experimented extensively with magnetrons prior to the end of World War II in the mid-1940s. A previously published ChemMatters article (Emsley, J. Microwave Chemistry. ChemMatters 1993, 11 (4), pp 69) describes how magnetrons played a role in World War II: At the start of the war in 1939 the Royal Air Force used microwaves to track Nazi warplanes attacking England. They called their secret rays, radar. The electronic tubes they used to produce the rays were manufactured secretly by the American company Raytheon at Waltham, Massachusetts. The Emsley article also describes how microwaves are generated by a magnetron: Microwaves are generated in a device called a magnetron, a World War II invention that was the heart of antiaircraft radar. The magnetron is a hollow cylinder with irregular walls, a rod-like cathode in the center, and a strong magnet positioned with N and S poles at opposite ends of the cylinder. An electric current flows from the cathode (which is electrically heated to help free electrons) across the air space to the cylinder wall that serves as the anode. As electrons begin this passage, the magnetic field forces them to move in circles around the cathode. The circular acceleration of the charged electrons creates electromagnetic waves. The magnetron in ovens is designed to produce waves that vibrate 2.45 billion times a second, that is, at a frequency of 2.45 gigahertz (GHz). Called microwaves because of their relatively short length (12 cm), the waves flow through a pipe-like guide to the stirrer, which looks like a fan but acts to reflect the microwaves in many directions. This selected frequency of 2.45 GHz was chosen particularly because it is the frequency at which the microwaves heat water most efficiently. It is commonly thought that one should never put metal in a microwave, and this is somewhat a myth in itself. This topic is included in the Anticipating Student Questions section below. Some microwaves now come with a metal cooking rack, which is used to elevate food above the microwave turntable as it cooks. An episode of a show produced by the California Institute of Technology described the reason why these metal racks are safe: The electrons in metal are mobilethey can move freely among atoms when the metal is thick, smooth, with rounded edgesthat metal rackthe moving electrons can bounce around freely while rarely hitting another metal atom. Rack doesnt get hot ( HYPERLINK "http://lohdown.caltech.edu/script_archive?date_to_view=2006-07-31" http://lohdown.caltech.edu/script_archive?date_to_view=2006-07-31). This is quite different from water molecules present in food in the microwave, which are specifically meant to bounce around and hit other water molecules, generating heat to cook the food. Microwaves do generate an electric current within metal objects in a microwave oven. Difficulties can arise when thin, sharp metallic objects are placed in the oven. These sorts of objects, such as a fork with sharp tines, can build up an electric charge on the points, which can cause a spark. Some food products specifically direct users to put metal in a microwave, although they may not realize it. For example, bags of microwave popcorn have a susceptor on the side of the bag that is placed face-down in the oven for cooking. The susceptor is typically a thin layer of aluminum with a polymer coating and can be seen as a dark rectangle in that portion of the bag. An electric current is generated in the metal susceptor, which can get as hot as 250 C. This helps to melt the solid fats and pop the corn, and is the reason microwave popcorn bags have the direction Heat this side up, so that the popcorn kernels and other solids sit on the susceptor. Metals are also used in crisping sleeves that are used to intensely heat up portions of food, such as the crusts of pizza-style products, so that they brown and crisp in the microwave. Metal is also a large part of a microwave ovens construction. The inner metal walls of a microwave oven allow microwaves to reflect off the walls and remain in the cooking chamber as the oven operates. The window portion of a microwave door also contains metal, in the form of a mesh or grid. The grid is designed so that the spacing of the holes in the grid is larger than that of the wavelength of the microwaves used in the oven. This reflects any microwaves that strike the window area back into the cooking chamber, thus containing them. The grid does allow for wavelengths in the range of visible light to pass through, so that the user can have a view of the food through the window without danger or harm from escaping microwaves. Microwave ovens have found use not only in the home, but also in the laboratory. Chemists began to take an interest in microwave heating after a group at Laurentian University, Ontario, Canada, showed what they [the ovens] could do, in 1988. Richard Gedye, Frank Smith, and Kenneth Westaway reported that reactions went faster and gave more product when they were carried out in microwave ovens (Emsley, J. Microwave Chemistry. ChemMatters. 1993, 11 (4), p 7). A reaction is cited that was completed in 35 seconds in a microwave oven, versus the 12 hours it normally took without microwave heating. Microwave radiation has also been used to assist in a technique of creating diamonds. A previously published ChemMatters article describes the technique: a new chemical vapor deposition technique to create large ultrahard diamonds in under a day. A small synthetic seed diamond is first placed into a special growth chamber, a standard microwave is turned on and then a mixture of methane, nitrogen, and hydrogen gas is added to the unit. The microwave radiation generates plasma (charged particles) which bombard the gas and cause a complex series of reactions that lead to a carbon rain that falls on the seed diamond. Ten minutes in a separate high-pressure, high-temperature chamber makes this synthetic diamond 50% harder than a regular diamond (Wood, C. Two Faces of Carbon. ChemMatters 2004, 22 (4), p 5). A distinction should be made between laboratory-grade microwave ovens and ones used in the home. A J. Chem. Educ. article states, Domestic microwave ovens are incompatible with many laboratory solvents and do not offer programmed temperature, pressure, and power control. Domestic microwave ovens are also not safely vented, and the simultaneous processing of multiple samples can be awkward (at best). Although kitchen microwave ovens can function in the teaching lab for the quick and routine heating of non-noxious aqueous solutions, they are unsafe for complicated synthetic, extraction, or digestion procedures. Laboratory-grade microwave instruments are much safer. Safety features such as proper ventilation, vapor sensing, and pressure relief on vessels allow for greater control of the experimental environment (Zovinka, E. P.; Stock, A. E. J. Chem. Educ. 2010, 87 (4), p 350.) These additional features are naturally accompanied by a much larger cost; a typical teaching laboratory microwave instrument can cost in the range of $20,000$30,000. More on electromagnetic radiation The topic of electromagnetic (EM) radiation is typically covered in chemistry textbooks in connection with atomic structure. Microwaves are one type of EM radiation. The EM spectrum spans the range of all types of EM radiation; each type is distinguished from another by its wavelength. From longest to smallest wavelength, the types of EM radiation are: radio, microwave, infrared, visible, ultraviolet, x-ray, and gamma ray. Within the portion of the spectrum connected with visible light, red light has the longest wavelength, and progresses through red, orange, yellow, green, blue, indigo, to violet, which has the shortest wavelength.  From ChemMatters, April 1999, p 5. Electromagnetic waves themselves are, as the name suggests, a combination of an oscillating electric field and an oscillating magnetic field. The two fields are perpendicular to one another, with identical wavelengths, speed, and direction of travel. The waves are able to carry energy from one location to another. A visual animation of the two fields together forming one wave is shown at  HYPERLINK "http://science.hq.nasa.gov/kids/imagers/ems/waves2.html" http://science.hq.nasa.gov/kids/imagers/ems/waves2.html. A still frame of that animation is shown below, with the electric field shown as blue arrows, and the magnetic field shown as red arrows.  From  HYPERLINK "http://www.nasa.gov/images/content/56454main_waves.gif" http://www.nasa.gov/images/content/56454main_waves.gif In a vacuum, all electromagnetic radiation, regardless of wavelength, travels at a velocity of 3 x 108 m/s, which students typically associate with the speed of light, abbreviated as c. This velocity is related to the wavelength and frequency of a wave using the equation c = (() ((), where c equals 3 x 108 m/s, ( is wavelength, and ( is frequency. This equation could be used by students to calculate and confirm the frequency of the microwaves stated in the article. That is, 3 x 108 m/s = (12.24 cm)(1 m / 100 cm)((), solving for a frequency of 2.45 x 109 hertz. The unit hertz means cycles per second and can also be shown with a label of s-1. Since wavelength and frequency are inversely related, EM radiation with a longer wavelength, such as radio and microwaves, are associated with low frequencies. EM radiation with a shorter wavelength, such as gamma and X-rays, are associated with high frequencies. More on glass The second myth that Rohrigs article presents, The bottoms of old windows are thicker because glass, being a liquid, flows over time, stems from the idea that many people assumed that glass was liquid, while it is actually solid. because, on a molecular level, glass looks more like a liquid. As an amorphous (from the Greek roots a = without, morph = form) solid, glass lacks the orderly crystalline structure that one would normally expect in a solid. On the molecular level, this more random structure gives it the appearance of a liquid. The glass myth could be used in connection with a discussion of phases of matter, including properties typically associated with solids and liquids, and certain materials that seem to be a confusing mix of the two phases, such as the Silly Putty toy (for more information, see  HYPERLINK "http://pubs.acs.org/cen/whatstuff/stuff/7848scit3.html" http://pubs.acs.org/cen/whatstuff/stuff/7848scit3.html) mentioned in the article. The early history of glass has a somewhat mythical beginning in itself. The Web site  HYPERLINK "http://www.glasslinks.com/newsinfo/histppg.htm" http://www.glasslinks.com/newsinfo/histppg.htm states According to the Roman historian Pliny, who wrote in Naturalis Historica in 77 A.D., man first produced glass by accident about the year 5000 B.C. Phoenician sailors feasting on a beach near Belus in Asia Minor, could find no stones on which to place their cooking pots; therefore, they set them on blocks of soda carried by their ship as cargo. As the fire's heat increased, the sand and soda turned to molten glass. Pliny's anecdote now is considered apocryphal, but it contains an accurate recipe for producing glass: heat plus silica and soda ash. Natural glass has always existed, due to the combination of rocks with high-temperature environments such as volcanoes, lightning strikes, or meteorites striking the earth. Early peoples used natural glass, such as obsidian, in the construction of cutting tools. Over time, production of glass items progressed from making small objects such as beads, to the creation of hollow glass items using a core of compacted sand, to the ability to blow glass, to advances in the production of plate glass. Until the past few hundred years, the use of glass in windows was a luxury limited to the rich and to select important buildings. Even when people were able to purchase windows, previous methods of making window glass limited the size of an overall piece of glass. Pieces were often joined together with lead strips to make windows, producing an overall effect quite different from the large, clear, and transparent views we enjoy today in nearly every structure we enter. Rohrigs article references a past ChemMatters article that focused specifically on glass, Roberta Baxters Glass: An Amorphous Solid (ChemMatters 1998, 16 (3), pp 1011). The two- page article provides an excellent and concise background of the composition and manufacture of glass. Much of that information is quoted below to provide instructors with additional background to enhance a discussion of the glass myth. The main component of glass is silicon dioxide (SiO2), also known as sand or silica. Pure silicon dioxide glass can be made, but it requires a high melting temperature of 1,700 C and quickly becomes too stiff to mold. The addition of metal oxides such as sodium oxide (Na2O) and calcium oxide (CaO), lowers both the melting temperature and the viscosity (resistance to flow) of the glass, making it easier to mold. To make glass, the materials are melted until they flow easily like water. Then the mixture is cooled. As glass cools, it becomes more viscous until it becomes rigid enough to become a solid. The particles from which glass is made are more or less frozen into place in a much more random, disorganized manner than in a true crystalline solid. Solid glass is distinguished from crystalline material because it has no long-range order, no simple repeating unit. Because there are no consistent distances between the bonded particles, they break up at different temperatures. This results in glass not having a specific, fixed melting point. Rather, heated glass becomes softer and softer as its temperature is raised until it finally is fluid enough to be called melted. Glass is not composed of one single chemical compound; it can be made with many different compositions. Manufacturers vary the composition of the glass depending on its intended use. To manufacture glass, the powdered ingredients, called the frit, are poured into a large furnace. Glassmakers also add chunks of the same type of glass to the mix. This is known as the cullet, and it speeds up the melting process, because it melts at a lower temperature than the raw materials. The furnace heats the mixture to about 1,3001,600 C, a lower temperature than the melting point of the other components. The cullet begins to melt and dissolves the other ingredients in it. After the glass is molten, it is poured out of the furnace, and the shaping process begins. The final step in the process of glass making, the annealing process, is crucial. If hot glass is cooled too quickly, it develops stress points and easily breaks. To prevent this from occurring, glass is slowly cooled in an annealing oven, called a lehr. Most silica used in glass manufacturing is slightly impure because it contains tiny amounts of iron, resulting in a greenish-yellow tint. This can be neutralized by adding manganese dioxide (MnO2). The purplish tint of the MnO2 is complementary to the greenish-yellow of the iron impurity, allowing the glass to appear colorless. Artisans use colored impurities to purposefully color glass. A wide range of colors was discovered by experimenting with metal oxides. During the manufacturing of glass, different powdered oxides are added to the frit and melted in the furnace with the other ingredients. The metal ions fit into the glass matrix and produce unique colors. Baxters article also points out several differences between amorphous and crystalline solids. The differences highlight why glass, as an amorphous solid, is so particularly suited to its use in windows and other products. For example, amorphous solids have identical properties in all directions. This allows glass to be cut in any direction, in comparison with a crystalline solid, which has defined fracture planes. Crystalline materials tend to appear translucent or opaque, while glass is transparent. The broad melting range of glass means it can be worked while highly viscous, which allows it to be used in glassblowing. In comparison, crystalline materials melt over a much smaller temperature range, making it more difficult to work them. Glass composition varies greatly. However, students are likely familiar with at least two of the major categories of glass: soda-lime glass, used for windowpanes, bottles, and jars, and borosilicate glass, used for laboratory glassware. The Corning Museum of Glass Web site ( HYPERLINK "http://www.cmog.org/dynamic.aspx?id=5658" http://www.cmog.org/dynamic.aspx?id=5658) contains the following descriptions of these two types of glass: Soda-lime glass is the most common (90% of glass made), and least expensive form of glass. It usually contains 6075% silica, 1218% soda, and 512% lime. Resistance to high temperature and sudden changes of temperature are not good and resistance to corrosive chemicals is only fair. Borosilicate glass is any silicate glass having at least 5% of boric oxide in its composition. It has high resistance to temperature change and chemical corrosion. Not quite as convenient to fabricate as either lime or lead glass, and not as low in cost as lime, borosilicates cost is moderate when measured against its usefulness. Pipelines, light bulbs, photochromic glasses, sealed-beam headlights, laboratory ware, and bake ware are examples of borosilicate products. An additional amorphous substance that students may find interesting and similar in appearance to glass is peanut brittle. A previous article in ChemMatters (Catelli, E. Peanut Brittle. ChemMatters 1991, 9 (4), pp 47, see  HYPERLINK "http://www.chemistryconnections.com/chemmatters/peanut brittle.pdf" http://www.chemistryconnections.com/chemmatters/peanut brittle.pdf) stated It looks like glass, and it certainly breaks like glass, but it tastes sweet. It is no accident that peanut brittle resembles light brown glass. It is an amorphous solid, also known as a glass. In comparison with crystalline candies, such as fudge and fondant, the goal for peanut brittle and other amorphous hard candies is to have NO crystals form. This is done by creating a very viscous sugar (mainly sucrose) solution, which restricts the movement of the molecules in solution, preventing them from moving into an orderly array. When the solution is quickly cooled, the molecules form an amorphous structure. The addition of corn syrup to the sugar solution also serves to further disrupt formation of a lattice structure, since it contains a different kind of sugar, glucose, which is unable to fit into the sucrose crystal lattice. Glucose also forms long chains that further block sucrose molecules from forming a crystalline structure. Rohrigs article mentions that glass has undergone intense scientific study in order to investigate whether it truly flows or not. This has included studying samples of glass up to 2,500 years old. A modern day application that also involves a close study of glass is the investigation of pieces of glass obtained from crime scenes, in a forensic laboratory. A past ChemMatters article highlighted how forensic scientists use both physical and chemical properties of glass to determine whether two glass samples came from the same source, and how glass-based evidence can reveal information about a crime (Rohrig, B. Glass: More Than Meets the Eye. ChemMatters 2006, 24 (3), pp 48). More on viscosity Viscosity is defined as the resistance of a liquid to flow. The example from the article compares honey with water; honey is more viscous than water, in that honey resists flow more than water. The temperature of a liquid affects its viscosity. In general, if liquid is heated, it becomes less viscous; if it is cooled, it becomes more viscous. A previous ChemMatters article described two ways to test for viscosity: A simple way to test for viscosity is to take two tall graduated cylinders containing equal volumes of two liquids. If you simultaneously drop a ball bearing in each cylinder, the one that takes the longest to fall will be the more viscous liquid. Another way to test for viscosity is to pour two liquids simultaneously through two small-mouthed funnels. The more viscous fluid will take longer to pass through the funnel (Rohrig, B. The Science of Slime! ChemMatters 2004, 22 (4), pp 1316). However, as stated in the Teachers Guide for that article, like many other relatively simple and intuitive concepts, viscosity becomes much more complex when you attempt to define it rigorously and quantitatively and measure it accurately. For a thorough treatment of viscosity, readers are directed to the ChemMatters, December 2004 Teachers Guide, pp 4552. Connections to Chemistry Concepts (for correlation to course curriculum) Scientific methodSteps in the scientific method are often mentioned in science textbooks as guidelines for investigating phenomena that we observe in the world around us. The idea of formulating a hypothesis, which is then tested in order to form a conclusion, can be used as a model process when determining if a myth is busted or not. Electromagnetic radiationMicrowave ovens make use of electromagnetic radiation. The wavelengths of the radiation used in the ovens places it in the microwave range, which typically has wavelengths in the range of 1 x 10-3 to 1 x 10-1 m ( HYPERLINK "http://imagine.gsfc.nasa.gov/docs/science/know_l1/spectrum_chart.html" http://imagine.gsfc.nasa.gov/docs/science/know_l1/spectrum_chart.html). Teachers can discuss the relationship between wavelength, frequency, and energy of the radiation in connection with the 2.45 GHz frequency used in microwave ovens. Laboratory instrumentationStudents may be unaware that microwave ovens are a tool found in the chemistry laboratory. With proper containers and solvents, microwave heating can be used to dissolve materials and to speed up reactions. Teachers can also discuss how commercial laboratory microwaves differ from those found in the home, with additional safety features, increased control over its operation, and programmable options. PolarityIn a microwave oven, microwaves produce constantly changing electric fields that affect polar molecules such as water, by causing the molecules to flip back and forth due to the change from a positive to a negative portion of the electric field. Phases of matterA comparison of the properties and structures of liquids and solids can tie in to a discussion of the amorphous structure of glass, in that glass is a solid, but has a molecular-level structure that resembles a liquid. Instructors could also mention other examples that seem to have both liquid and solid properties, such as Silly Putty, and mixtures of sand/water and cornstarch/water. A distinction can also be made between an amorphous solid and a crystalline solid. ViscosityThe viscosity of liquids can be compared using simple tests (see More on viscosity section above), to explore how viscosity differs depending on the liquid chosen, as well as its temperature. Mixtures vs. compoundsGlass is an example of a homogeneous mixture that is in the solid phase and can be used in a discussion of how to determine whether a substance is a mixture or a compound. Possible Student Misconceptions (to aid teacher in addressing misconceptions) Researchers only discover things that they are originally looking for. The instance of engineer Percy Spencer walking by magnetrons with a candy bar in his pocket, and happening to notice that the bar turned soft, is an example of serendipity, or making a fortunate discovery by accident. Accidental discoveries have resulted in the development of many products, such as Teflon, mauve (the first aniline dye), and aspartame (NutraSweet). Microwaves are only used to cook food. Microwave ovens are also used in the laboratory to speed heating of chemicals and reactions. Microwave radiation was also used in military applications, such as in microwave radar equipment, even before the radiation was used as a way to cook food. Microwaves heat food from the inside out. Microwaves primarily heat food by heating water within the food. Heating depends on the water content of the food; wherever the water is located in the food is where the heating will occur, either on the inside, outside, or somewhere in between. All water molecules can absorb microwaves. Water molecules that are held in a rigid configuration, such as the crystalline structure of ice, are unable to rotate back and forth, and thus are not affected by microwaves. The molecules are unable to rub up against one another to generate the friction necessary to convert microwave energy to thermal energy. This is why an ice cube (without a film of liquid water on its surface) placed in a microwave will not melt due to microwaves. Packages of frozen vegetables recommend adding a tablespoon or two of water before cooking in a microwave because of this. The bottoms of old windows are thicker because glass, being a liquid, flows over time. Scientific study has shown that the glass used to make windowpanes exhibits no flow at all. Glasss amorphous structure, which resembles that of a liquid, has led many to assume that it is a viscous liquid masquerading as a solid. However, glass is a solid and does not flow. Anticipating Student Questions (answers to questions students might ask in class) What can I do to check if something I hear is a myth? Many of us receive forwarded email messages that contain some sort of warning about phenomena that happened to a friend, and that encourage us to send it to everyone you know to warn them as well. Determining if these messages contain myths can often be done by checking research others have already done to determine if it is true or not. The Web site  HYPERLINK "http://www.snopes.com" http://www.snopes.com is a good place to start. If possible (and safe), we can also test something ourselves to conclude if it is true or not. Why cant metals be placed in a microwave? Microwaves generate an electric current within any metal objects placed in the oven. Depending on the object, this can cause a spark. For example, thin, sharp metallic objects, such as forks, can build up an electric charge on any sharp points, which can cause a spark. In reality, you probably have placed metal in a microwave oven, to your benefit. Thin layers of metal are in bags of microwave popcorn and in crisping sleeves that are used with microwavable convenience foods. The metal helps to intensely heat any nearby areas of food. Why cant people with pacemakers be near a microwave? The U.S. Food and Drug Administration Web site states ( HYPERLINK "http://www.fda.gov/Radiation-EmittingProducts/ResourcesforYouRadiationEmittingProducts/Consumers/ucm142616.htm" \l "7" http://www.fda.gov/Radiation-EmittingProducts/ResourcesforYouRadiationEmittingProducts/Consumers/ucm142616.htm - 7): At one time there was concern that leakage from microwave ovens could interfere with certain electronic cardiac pacemakers. Similar concerns were raised about pacemaker interference from electric shavers, auto ignition systems, and other electronic products. FDA does not specifically require microwave ovens to carry warnings for people with pacemakers. The problem has been largely resolved because pacemakers are now designed to be shielded against such electrical interference. However, patients with pacemakers may wish to consult their physicians if they have concerns. How is bullet-proof glass made? Can it really stop a bullet? A more accurate term is bullet-resistant glass. The basic method for producing bullet-resistant glass is by layering thin sheets of a polymer, such as polycarbonate, with sheets of glass, and bonding them with heat. Bullets will break one or more layers of the glass, but the polymer helps to absorb the bullets energy, hopefully stopping it from full penetration to the other side. In-class Activities (lesson ideas, including labs & demonstrations) A previously published ChemMatters article (Emsley, J. Microwave Chemistry. ChemMatters 1993, 11 (4), pp 69) describes a brief experiment to illustrate that not all water molecules can absorb microwaves. It states You can demonstrate this by putting a cup of water and a cup of ice cubes in the microwave together for 90 seconds. The water will be almost boiling but the ice will not have melted. (If you want to try this experiment, be sure to take the ice cubes straight from the deep freeze so they do not have a film of liquid water on the surface.) Robert Becker answered the question How do microwave ovens work? in the April 2000 issue of ChemMatters (p 16). The article included an experiment to demonstrate why manufacturers selected a microwave frequency of 2.45 GHz. It states The microwave energy selected by manufacturers is of just the right frequency to get water moleculesspecifically water moleculesto start spinning around like tops. To dramatize this, try taking cup of water in one microwavable coffee cup, cup of oil in another, and cup of sugar in a third. Then cook them all in the microwave for 2030 seconds. Take them out, and carefully touch the bottoms of all three cups. The water cup will be quite hot; the oil cup will be slightly warmed; and the sugar cup will not have heated up at all. Several Web sites share a procedure to calculate the wavelength of microwaves used in a standard home microwave, and to use this information to calculate the speed of light. The procedure uses marshmallows placed in a single layer in a microwave-safe dish, with a flat side of each marshmallow facing up, cooked in the microwave without a turntable. The marshmallows do not melt evenly, with a regular pattern of melted/unmelted marshmallows observed. Directions are available at:  HYPERLINK "http://orbitingfrog.com/blog/2008/05/13/measure-the-speed-of-light-using-your-microwave/" http://orbitingfrog.com/blog/2008/05/13/measure-the-speed-of-light-using-your-microwave/,  HYPERLINK "http://blog.cencophysics.com/2010/01/measuring-the-speed-of-light-with-marshmallows/" http://blog.cencophysics.com/2010/01/measuring-the-speed-of-light-with-marshmallows/,  HYPERLINK "http://www.physics.umd.edu/icpe/newsletters/n34/marshmal.htm" http://www.physics.umd.edu/icpe/newsletters/n34/marshmal.htm, and others. Students could prepare their own tasty example of an amorphous solid with an appearance and properties similar to glasspeanut brittle. Directions are available in a past ChemMatters article (Catelli, E. Peanut Brittle. ChemMatters 1991, 9 (4), pp 47, see  HYPERLINK "http://www.chemistryconnections.com/chemmatters/peanut brittle.pdf" http://www.chemistryconnections.com/chemmatters/peanut brittle.pdf). Other peanut brittle recipes connected with science are available, such as  HYPERLINK "http://www.glencoe.com/sec/science/chemistry/mc/pow/chapter03.shtml" http://www.glencoe.com/sec/science/chemistry/mc/pow/chapter03.shtml and Partial Thermal Degradation of Mixed Saccharides with Protein Inclusions  HYPERLINK "http://www.chymist.com/peanut brittle.pdf" http://www.chymist.com/peanut brittle.pdf. Instructors will need to be aware of any nut allergies and make suitable changes to the recipes. Students can gain hands-on experience with glass by working with glass tubing in the laboratory. A common experiment involves cutting a piece of tubing and fire-polishing the ends, creating a bend in glass tubing, and making glass pipettes. Students can perform a hands-on investigation of an additional substance that seems to blur the lines between a solid and a liquid by preparing a mixture of cornstarch and water. Students can try to pour the mixture, strike the surface quickly, etc. Directions are available at  HYPERLINK "http://www.stevespanglerscience.com/content/experiment/00000088" http://www.stevespanglerscience.com/content/experiment/00000088,  HYPERLINK "http://scifun.chem.wisc.edu/HOMEEXPTS/lumpyliquids.htm" http://scifun.chem.wisc.edu/HOMEEXPTS/lumpyliquids.htm, and  HYPERLINK "http://littleshop.physics.colostate.edu/Try At Home/goorecipeone.htm" http://littleshop.physics.colostate.edu/Try At Home/goorecipeone.htm. Out-of-class Activities and Projects (student research, class projects) Encourage students to read several myths tested on MythBusters episodes and propose how they would test each myth; myths from each episode are summarized at  HYPERLINK "http://en.wikipedia.org/wiki/List_of_MythBusters_episodes" http://en.wikipedia.org/wiki/List_of_MythBusters_episodes. Then, students can watch the episodes or read episode summaries to see how the MythBusters team conducted testing and controlled variables, along with the results. A previously published ChemMatters article (Emsley, J. Microwave Chemistry. ChemMatters 1993, 11 (4), pp 69) lists several statements regarding microwaves, asks the reader whether they are true statements or myths, and discusses the answers. Students could research these statements, determine if any of the statements could be tested, and decide based on their study, if they are busted, plausible, or confirmed. The statements are: 1) Food tastes different when cooked in a microwave oven (true), 2) Microwaved milk is bad for babies (false), 3) Microwaves can turn low-grade oil into high-grade fuel (true), 4) Microwaves cause cancer (false), 5) Some people can hear microwaves (true). Students may be interested to see glassblowing live. Possible field trip destinations could be a college science laboratorys glassblowing facility or a local glassblowing artists shop. Students can learn more about the composition of different types of glass, including specific materials used to produce certain colors, and specific properties of glass needed for specialty laboratory glassware. References (non-Web-based information sources)  The article Microwave Chemistry discusses five different true/false statements regarding microwaves, along with information on the history of microwave ovens, and how they work. (Emsley, J. Microwave Chemistry. ChemMatters 1993, 11 (4), pp 69) Becker answers the question How do microwave ovens work? along with an experiment to try (see the In-Class Activities section) and a discussion of the misconception that food is nuked in a microwave. (Becker, R. As a Matter of Fact: How do microwave ovens work? ChemMatters 2000, 18 (2), p 16.) A past ChemMatters article focuses on how forensic scientists match samples of glass, including studying their thickness, density, refractive index, and chemical composition, along with a Disappearing Glass activity that illustrates the refractive indices of glass, water, and glycerol (Rohrig, B. Glass: More Than Meets the Eye. ChemMatters 2006, 24 (3), pp 48). The accompanying Teachers Guide (ChemMatters Teachers Guide, October 2006, pp 2228) includes additional information. Baxter summarizes the composition of glass, its manufacturing, the decolorization and coloring of glass, and briefly mentions the myth that window glass flows. (Baxter, R. Glass: An Amorphous Solid. ChemMatters 1998, 16 (3), pp 1011) ____________________ Two Journal of Chemical Education articles describe the use of microwaves for laboratory and research work: Cresswell, S. L.; Haswell, S. J. J. Chem. Educ. 2001, 78 (7), pp 900904 (full text available for subscribers at HYPERLINK "http://pubs.acs.org/doi/abs/10.1021/ed078p900"http://pubs.acs.org/doi/abs/10.1021/ed078p900) and Zovinka, E. P.; Stock, A. E. J. Chem. Educ. 2010, 87 (4), pp 350352 (full text available for subscribers at HYPERLINK "http://pubs.acs.org/doi/abs/10.1021/ed800150e"http://pubs.acs.org/doi/abs/10.1021/ed800150e). The article Glass Doesnt Flow and Doesnt Crystallize and It Isnt a Liquid provides additional details on scientific study of the glass myth. Hawkes, S. J. J. Chem. Educ. 2000, 77 (7), pp 846848 (full text available for subscribers at  HYPERLINK "http://pubs.acs.org/doi/abs/10.1021/ed077p846" http://pubs.acs.org/doi/abs/10.1021/ed077p846). The history of glass and the beautiful and useful products it can make are described and colorfully shown in the article GlassSand + Imagination (Kolb, K. E.; Kolb, D. K. J. Chem. Educ. 2000, 77 (7), pp 812816, see  HYPERLINK "http://www.chihuly.com/pressroom/pdfs/JCE_77_p812.pdf" http://www.chihuly.com/pressroom/pdfs/JCE_77_p812.pdf). Web Sites for Additional Information (Web-based information sources) More sites on the MythBusters television show The homepage for the MythBusters television show features episode listings, video clips, interviews, and official information about the show. ( HYPERLINK "http://dsc.discovery.com/videos/mythbusters/" http://dsc.discovery.com/videos/mythbusters/) The ACS ChemClub Activity of the Month Web update Chemistry Behind MythBusters included information on where to find MythBusters episodes, how MythBusters could be the subject of discussions in the science classroom, and listed common chemistry demonstrations related to myths tested on the television show. ( HYPERLINK "http://portal.acs.org:80/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN&node_id=350&content_id=CNBP_024736&use_sec=true&sec_url_var=region1&__uuid=3f1bc240-e9ee-479e-b5f1-2f8b17de98da" http://portal.acs.org:80/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN&node_id=350&content_id=CNBP_024736&use_sec=true&sec_url_var=region1&__uuid=3f1bc240-e9ee-479e-b5f1-2f8b17de98da) In an NSTA Reports article, Jacob Blickenstaff describes MythBusters and its possible use in the science classroom, including its relation to multiple areas and levels of science. ( HYPERLINK "http://www.nsta.org/publications/news/story.aspx?id=56247" http://www.nsta.org/publications/news/story.aspx?id=56247) The Science Behind the Myths describes the science of over a dozen myths investigated on MythBusters. ( HYPERLINK "http://dsc.discovery.com/fansites/mythbusters/articles/hsw-index.html" http://dsc.discovery.com/fansites/mythbusters/articles/hsw-index.html) More sites on microwaves The 2005 article The Greatest Discovery Since Fire from Invention & Technology Magazine provides an extensive review of the history associated with the microwave oven. ( HYPERLINK "http://www.americanheritage.com/articles/magazine/it/2005/4/2005_4_48.shtml" http://www.americanheritage.com/articles/magazine/it/2005/4/2005_4_48.shtml) The journal Physics Education published the article Microwave oven experiments with metals and light sources, which aimed to answer the question Dont put metal objects in the microwave is common safety advice. But why? The article includes photographs of the results. ( HYPERLINK "http://physicsed.buffalostate.edu/pubs/TPT/TPTMay02Microwave/pe4606MicroWaves.pdf" http://physicsed.buffalostate.edu/pubs/TPT/TPTMay02Microwave/pe4606MicroWaves.pdf) Over 100 questions and answers about microwaves are collected at  HYPERLINK "http://www.howeverythingworks.org/microwave_ovens.html" http://www.howeverythingworks.org/microwave_ovens.html. A The Straight Dope column answers the question How are the microwaves in ovens different from those in cell phones? ( HYPERLINK "http://www.straightdope.com/columns/read/2117/how-are-the-microwaves-in-ovens-different-from-those-in-cell-phones" http://www.straightdope.com/columns/read/2117/how-are-the-microwaves-in-ovens-different-from-those-in-cell-phones) The Web page How Does a Microwave Oven Work includes a brief description of the basic theory of operation of a microwave, along with several diagrams. ( HYPERLINK "http://www.gallawa.com/microtech/how_work.html" http://www.gallawa.com/microtech/how_work.html) The Web page What is a Magnetron? briefly discusses the history and operation of magnetrons. ( HYPERLINK "http://www.wisegeek.com/what-is-a-magnetron.htm" http://www.wisegeek.com/what-is-a-magnetron.htm) A video posted on  HYPERLINK "http://www.youtube.com" http://www.youtube.com in 2008 suggesting that popcorn kernels could be popped using radiation from cellular phones eventually generated millions of views. Several articles discuss the myth of the use of this type of radiation for cooking popcorn, as well as an earlier myth regarding cooking eggs. ( HYPERLINK "http://www.howeverythingworks.org/page1.php?QNum=1566" http://www.howeverythingworks.org/page1.php?QNum=1566,  HYPERLINK "http://www.snopes.com/science/cookegg.asp" http://www.snopes.com/science/cookegg.asp, and  HYPERLINK "http://www.wired.com/underwire/2008/06/bluetooth-compa/" http://www.wired.com/underwire/2008/06/bluetooth-compa/) More sites on electromagnetic radiation NASAs Imagine the Universe site provides a brief introduction to the electromagnetic spectrum. ( HYPERLINK "http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html" http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html) An additional NASA Web page on the electromagnetic spectrum provides a jumping-off point for learning more about the different kinds of radiation, and includes a useful diagram that relates the wavelengths of each kind of radiation to the size of a common item. ( HYPERLINK "http://science.hq.nasa.gov/kids/imagers/ems/waves3.html" http://science.hq.nasa.gov/kids/imagers/ems/waves3.html) More sites on glass A 2008 article published in The New York Times discusses the nature of glass and the theories surrounding the subject. ( HYPERLINK "http://www.nytimes.com/2008/07/29/science/29glass.html?_r=1" http://www.nytimes.com/2008/07/29/science/29glass.html?_r=1) A Prince Ruperts Drop is an interesting (and explosive) piece of glass created by dropping a bit of hot molten glass into cold water. A description and video are available at  HYPERLINK "http://www.museumofglass.org/education/learn-about-glass/exploding-glass-ruperts-drop/" http://www.museumofglass.org/education/learn-about-glass/exploding-glass-ruperts-drop/. A history of the origins and development of glassmaking is available at the Tacoma, Washington Museum of Glasss Web site. ( HYPERLINK "http://www.museumofglass.org/education/learn-about-glass/glass-and-the-arts/" http://www.museumofglass.org/education/learn-about-glass/glass-and-the-arts/) A Web page on Science & Glass describes the ingredients in glass and each ingredients purpose, and connects them to the ingredients in a chocolate chip cookie recipe. ( HYPERLINK "http://www.museumofglass.org/education/learn-about-glass/science-glass/" http://www.museumofglass.org/education/learn-about-glass/science-glass/) Users can virtually experience the different steps in using glassblowing to create a work of art. ( HYPERLINK "http://www.museumofglass.org/education/virtual-hot-shop/" http://www.museumofglass.org/education/virtual-hot-shop/) The Corning Museum of Glass offers an extensive list of glass resources related to Art & History, Science & Technology, Glassmaking Techniques, and a Dictionary at  HYPERLINK "http://www.cmog.org/dynamic.aspx?id=264" http://www.cmog.org/dynamic.aspx?id=264. An interactive NOVA Web site discusses the science of medieval stained glass, with accompanying photos and graphics. ( HYPERLINK "http://www.pbs.org/wgbh/nova/ancient/science-stained-glass.html" http://www.pbs.org/wgbh/nova/ancient/science-stained-glass.html) More sites on viscosity A virtual experiment called the Viscosity Explorer allows students to investigate how viscosity can vary depending on the liquid selected and that liquids temperature. ( HYPERLINK "http://www.seed.slb.com/labcontent.aspx?id=11660" http://www.seed.slb.com/labcontent.aspx?id=11660) A general discussion of viscosity, along with information on Newtonian and non-Newtonian fluids is available at  HYPERLINK "http://www.sciencebyjones.com/viscosity_overview.htm" http://www.sciencebyjones.com/viscosity_overview.htm. More Web Sites on Teacher Information and Lesson Plans (sites geared specifically to teachers) A portion of Chapter 16 of the text A Natural Approach to Chemistry presents a lesson plan and hands-on activity designed to investigate the questions What is viscosity? How can we measure and experience it? ( HYPERLINK "http://www.anaturalapproachtochemistry.com/natc_sample_pages/NC_TG_16B.pdf" http://www.anaturalapproachtochemistry.com/natc_sample_pages/NC_TG_16B.pdf) A NOVA Teachers Guide presents an activity where students determine the relative viscosity and flow rate of several liquids, and connect their observations to the viscosity and flow rate of different kinds of lava. ( HYPERLINK "http://www.pbs.org/wgbh/nova/teachers/activities/3215_volcanoc.html" http://www.pbs.org/wgbh/nova/teachers/activities/3215_volcanoc.html) Two Rivers that Refuse to Mix Background Information (teacher information) More on mixing of earths waters The Rio Negro isnt the only river to enter the Amazon with interesting results. The Tapajos River also delivers its waters to the Amazon right at the city of Santarem, with results similar to those of the meeting of the Rio Negro and the Amazon rivers.  HYPERLINK "http://www.youtube.com/watch?v=6vGNYZtYU9w&NR=1" http://www.youtube.com/watch?v=6vGNYZtYU9w&NR=1 Rivers dumping into Lake Benmore in New Zealand Differences in density also affect the mixing of waters when rivers enter large lakes. In New Zealand, two rivers with distinctly different properties flow into Lake Benmore, with very different results. Pickrill and Irwin discuss this situation in their article. Circulation and Sedimentation in Lake Benmore, New Zealand, in the New Zealand Journal of Geology and Geophysics, Vol. 29, 1986. pp 87-96. In deep lakes with dominant headwater inflows, interactions between inflowing river water and receiving lake water is a major determinant of circulation and sedimentation (e.g., Hamblin & Carmack 1978; Irwin & Pickrill 1982; Pickrill & Irwin 1982). The passage of river water through the lake is principally controlled by density differences between the water bodies. Density is largely controlled by water temperature and concentration of dissolved and suspended particulate matter (SPM). Three inflow conditions can occur. (1) If river water is denser than lake water, it flows to a sharply defined plunge line, where it sinks and flows downslope along the bottom as an underflow. (2) If the lake is stratified and river waters enter at densities equivalent to those in midwater depths, then the water sinks at the plunge line and flows downslope to a depth where its density matches that of the surrounding lake water. The river water spreads at this depth as an interflow along surfaces of constant density. (3) If river water is less dense than receiving lake water it spreads across the surface as an overflow. Lake Benmore differs from previously studied New Zealand lakes in having two separate arms, which have different river inflow characteristics (Fig. 4A, B). The Waitaki Arm is fed by upstream lakes that buffer normal fluctuations in river temperature and turbidity, whereas the Ahuriri Arm is fed by uncontrolled river flows. These differences in river regime produce different lake/river interactions in the two arms, which in turn produce interesting interactions at the confluence of the gorges. Pickrill and Irwin then go on to discuss the differences in the two rivers and their effects on this artificial lake. (pp 87-96) ( source:  HYPERLINK "http://books.google.com/books?id=Y8s4AAAAIAAJ&pg=PA87&lpg=PA87&dq=density+river+water&source=bl&ots=-6KLbz1od0&sig=XP5VnJO219HZAMlmnXW642adcTs&hl=en&ei=7n6yTJPLOMOclgfW8rG9Ag&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCMQ6AEwAjge#v=onepage&q=density%20river%20water&f=false" http://books.google.com/books?id=Y8s4AAAAIAAJ&pg=PA87&lpg=PA87&dq=density+river+water&source=bl&ots=-6KLbz1od0&sig=XP5VnJO219HZAMlmnXW642adcTs&hl=en&ei=7n6yTJPLOMOclgfW8rG9Ag&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCMQ6AEwAjge#v=onepage&q=density%20river%20water&f=false) The confluence of the Clearwater and Snake Rivers in Idaho On the Idaho-Washington border, the Snake River flows north to merge with the Clearwater River, flowing east to west. In the springtime, where they meet, the two rivers appear to have very little mixing and seem to flow parallel to each other for several miles, according to thermal imaging studies done on the two rivers. Unlike the Amazon and Rio Negro, the division is not based on sediment differences (density), so there is no visible division, but a small difference in temperature is the dividing line. Snake River is a fairly shallow, fast-moving river. Temperatures in the Snake River are a degree or two warmer than in the Clearwater. In the summer the shallow waters of the Snake River can be as much as 10 Co warmer than those of the Clearwater. This extreme temperature gradient causes colder water from the Clearwater River to flow under the Snake River waters. The entire surface of the confluence of the two rivers is covered with warmer Snake River water. Salmon migrate along the Clearwater River, heading for the Pacific Ocean. Many of them move into the Snake River. By regulating augmented flow from the Dworshak Reservoir, about 35 miles to the east along the Clearwater River, the temperature of the Snake River can be regulated so that cooler waters allow easier migration of the salmon into Snake River waters. The Dworshak Reservoir is very deep and contains very cold water that can be released during the summer months when the salmon are migrating, to ensure a larger number of salmon successfully migrate to the ocean, and to fishermen. The report of this study to determine the temperatures at varying depths along both rivers, and to use this information to improve salmon yield in these rivers can be found at  HYPERLINK "http://www.flow3d.com/pdfs/tp/wat_env_tp/FloSci-Bib7-04.pdf" http://www.flow3d.com/pdfs/tp/wat_env_tp/FloSci-Bib7-04.pdf. The report contains simulated 3-D images of the temperature gradients at the confluence of the two rivers. Satellite photos from bing"! show the confluence of the two rivers. The Clearwater River flows east to west, and the Snake River flows into the Clearwater from the south. The city on the left of the Snake River is Clarkston, WA, and the city on the right of the Snake River is Lewiston, ID. The Snake River is the dividing line between Washington on the west and Idaho on the east.  INCLUDEPICTURE "http://www.bing.com/local/GetMap.ashx?w=280&h=280&b=h,stl.h,mkt.en-us&rf=o&rp=n&z=11&c=46.415909,-117.033505" \* MERGEFORMATINET  Zooming in  INCLUDEPICTURE "http://www.bing.com/local/GetMap.ashx?b=h,stl.h,mkt.en-us&rf=o&rp=n&z=14&c=46.415909,-117.033505&w=660&h=602" \* MERGEFORMATINET  ( HYPERLINK "http://www.bing.com/maps/?v=2&cp=46.42286182890098~-117.03329086297071&lvl=14&sty=h" http://www.bing.com/maps/?v=2&cp=46.42286182890098~-117.03329086297071&lvl=14&sty=h) Where rivers and seas meet the oceans Differences in water properties also exist at points where fresh water from rivers enters the oceans. This usually means that the fresh water from the river dilutes the salty ocean water, resulting in a decrease in salinity around the mouths of rivers. This difference in salinity can produce plumes of fresh water flowing over the denser ocean water. River water temperatures are usually different from those of ocean water also, contributing to density differences at estuaries. Both these properties can result in limited mixing of the two waters in these areas, similar to that of the Rio Negro and the Amazon confluence. As the fresh water flows out to sea over the saltier ocean water at high tide, the denser ocean water can also flow up the estuary under the fresh water. This can cause brackish water in the estuary. At low tide, the brackish water is expelled from the estuary. This circulatory flow refreshes the estuary and flushes out the brackish water and pollution in the estuary. As a result of the circulation in these waters, sea life abounds, especially plankton, which provides food for diverse food webs. The Mediterranean Sea provides a somewhat different, counter-intuitive scenario to the fresh water river and the salt water ocean. The Mediterraneans water enters the Atlantic Ocean and creates a difference in properties of temperature, salinity and density, almost as expected. The difference here is that water in the Mediterranean Sea is actually more salty, and therefore more dense, than the Atlantic Ocean waters where they meet in the Straits of Gibraltar. This is true because the Mediterranean experiences high temperatures and rapid evaporation of its waters, concentrating the dissolved solids (e.g., salt) already in the remaining water, making it more saline than ocean water. Another factor increasing the salinity of the Mediterranean waters is the construction in the last 50 years of two major dams (the Aswan High Dam and the Ebro) on rivers feeding the Mediterranean, which resulted in less fresh water flowing into the Mediterranean to dilute the salt. Because the salty Mediterranean water is more dense than the Atlantic waters, water flowing from the Mediterranean through the Straits of Gibraltar actually sinks below the Atlantic Ocean waters. Once this plume of salty water leaves the Mediterranean, if flows west and affects the Gulf Stream that warms Europes climate. Increasing salinity of the Mediterranean waters is predicted to have an effect on this climate, but present studies are inconclusive as to what that effect might be. Some scientists have speculated that the increasing salinity of North Atlantic waters from the Mediterraneans water may be sufficient to lower the freezing point enough to keep the far north Atlantic ice-free through the winter season. Amy Bower, an Associate Scientist at Woods Hole Oceanographic Institution, has discovered that the plume of salty water from the Mediterranean doesnt mix easily with ocean water, but remains in huge underwater eddies, measuring from 40 to 150 km in diameter that sink and begin rotating clockwise. These bundles of salty water can drift for several years through the Atlantic, before breaking up or decaying. No one yet knows the effect of these underwater eddies on climate. ( HYPERLINK "http://www.womenoceanographers.org/Default.aspx?pid=E1E3254E-1C80-4e6d-ABBF-1EC5F5436C3E&id=AmyBower" http://www.womenoceanographers.org/Default.aspx?pid=E1E3254E-1C80-4e6d-ABBF-1EC5F5436C3E&id=AmyBower) More on plant decomposition and humification An article in the Journal of the Brazilian Chemical Society discusses The Influence of Seasonalness on the Structural Characteristics of Aquatic Humic Substances Extracted from Negro River (Amazon State) waters: Interactions with Hg(II). The authors analyzed water from the Rio Negro about 8 miles upstream from Manaus over one year to determine whether mercury content changes with the seasons. The article includes a lot of information about humic substances and shows that the pH of the river varied little seasonally from its average of 4.5, being slightly higher in the months just preceding the rainy season. The authors discovered that the degree of organic decay (humification) varies with the season, depending on the amount of rainfall and the rate of flow of water in the river. At the beginning of the rainy season, when the river levels are at their lowest (from the long dry season), the degree of humification is high, while at the end of the rainy season, when the river levels are high, humification is diminished. This makes sense, since the river is probably flowing more slowly when its water level is low, and this gives the organic material more time to decay. In times when the amount of rainfall (called the pluviometric index in the article) is high, and the amount of river water flow is low (called the fluviometric index), the degree of humification is at a maximum. They cite evidence that elevated levels of mercury have been found in Amazonian waters and aquatic soils far from any possible human-related emission sources, and it is in search of the source of this mercury that they did this research. They found that mercury does tend to bind to decayed organic material, most likely with samples having greater aromatic/phenolic/ester group content, resulting from greater decay of the aquatic organic material. Thus, the greater the degree of humification of the organic material, the greater the mercury content contained therein. (Source:  HYPERLINK "http://www.scielo.br/pdf/jbchs/v18n4/27.pdf" http://www.scielo.br/pdf/jbchs/v18n4/27.pdf) One of the main characteristic items of interest in the Rio Negro ecosystem not mentioned in the article is driftwood. Apparently, driftwood is plentiful, and it is a main contributor to the decaying organic material in the river. It also offers cover and concealment to many species of fish, both predator and prey. Fish hide in its root systems, branches and leaf litter. Very little aquatic vegetation can be found in Rio Negro water, so the driftwood environs may serve as the main food source for fish. Decay of driftwood and its organic matter in the water also contributes to the low pH of the river water. As mentioned in the article, there are very few insects along the Rio Negro, due at least in part to its acidity and the inability of insects like mosquitoes to breed on or in the water. Decaying/decayed plant material produces chemical and microbial transformations of organic debris. The resulting soil organic material (SOM) is rich in humus, which is composed of humic and non-humic substances. The non-humic substances of SOM are all materials in soil that can be grouped in one of the categories of specific types of compounds; e.g., carbohydrates, lipids, and amino acids. An interesting point is that the decaying humic substances in river water are closely related to tannins. According to Wikipedia, The term tannin (from tanna, an  HYPERLINK "http://en.wikipedia.org/wiki/Old_High_German" \o "Old High German" Old High German word for  HYPERLINK "http://en.wikipedia.org/wiki/Oak" \o "Oak" oak or  HYPERLINK "http://en.wikipedia.org/wiki/Fir" \o "Fir" fir tree, as in  HYPERLINK "http://en.wikipedia.org/wiki/Tannenbaum" \o "Tannenbaum" Tannenbaum) refers to the use of wood tannins from oak in  HYPERLINK "http://en.wikipedia.org/wiki/Tanning" \o "Tanning" tanning animal  HYPERLINK "http://en.wikipedia.org/wiki/Hides" \o "Hides" hides into  HYPERLINK "http://en.wikipedia.org/wiki/Leather" \o "Leather" leather; hence the words "tan" and "tanning" for the treatment of leather. However, the term "tannin" by extension is widely applied to any large  HYPERLINK "http://en.wikipedia.org/wiki/Polyphenolic" \o "Polyphenolic" polyphenolic compound containing sufficient  HYPERLINK "http://en.wikipedia.org/wiki/Hydroxyl" \o "Hydroxyl" hydroxyls and other suitable groups (such as  HYPERLINK "http://en.wikipedia.org/wiki/Carboxyl" \o "Carboxyl" carboxyls) to form strong complexes with proteins and other  HYPERLINK "http://en.wikipedia.org/wiki/Macromolecule" \o "Macromolecule" macromolecules. This effectively sums up the composition of humic substances. The humic substances consist of high molecular weight substances, brown to black in color, that are formed by secondary synthesis reactions. Humic substances are composed of fractions of humic acids and fulvic acids, as well as humins. (No, not the hoomans of Star Trek fame.) Humic acids comprise that fraction of humic substances that is not soluble in very acidic conditions (pH<2). They are dark brown or black in color. Fulvic acids are that fraction of humic substances that is soluble under all pH conditions. Fulvic acids are light yellow to yellow-brown in color. And humins are that fraction that is not soluble under any pH conditions. Humins are black in color. The difference in solubility is used to separate these three fractions of humus in the lab. Hydrochloric acid can be added to a sample containing humus, until the pH is ~1. This will dissolve the humic acids. Fulvic acids will already be dissolved (soluble at any pH). Humins will be insoluble at any pH and can now be filtered out of the sample. (If one filtered before the addition of HCl, the humic acids would have been filtered out also.)Then the pH can be raised by adding sodium or potassium hydroxide, precipitating out the humic acids, which can now be filtered out, leaving behind the fulvic acids component. Humic acids and fulvic acids are believed to be closely related to each other. Humic acids are higher molecular weight polymers than fulvic acids. Humic acids have a lower oxygen content and a higher carbon content than fulvic acids. A larger portion of the oxygen atoms of humic acids are located within the central structure of the long chain polymer, while the larger portion of oxygen atoms of fulvic acids are more likely to be parts of acidic functional groups. Acidity of fulvic acids range from 900-1400 meq/100g, while the acidity of humic acids range from 400-870 meq/100g. (Professor Weber of the Department of Soil Science & Agricultural Environment Protection at the Agricultural University of Wroclaw, Poland.  HYPERLINK "http://karnet.up.wroc.pl/~weber/humic.htm" http://karnet.up.wroc.pl/~weber/humic.htm) The American Chemical Societys CAS provides the following information about fulvic acid. CAS Number: 479-66-3 Name:1H,3H-Pyrano[4,3-b][1]benzopyran-9-carboxylicacid, 4,10-dihydro-3,7,8-trihydroxy-3-methyl-10-oxo- Molecular Structure:  HYPERLINK "http://www.lookchem.com/300w/2010/0621/479-66-3.jpg" \t "_blank"  INCLUDEPICTURE "http://www.lookchem.com/300w/2010/0621/479-66-3.jpg" \* MERGEFORMATINET  Synonyms:1H,10H-Pyrano[4,3-b][1]benzopyran-9-carboxylicacid, 3,4-dihydro-3,7,8-trihydroxy-3-methyl- 10-oxo- (6CI); Fulvic acid Molecular Formula:C14H12 O8 Molecular Weight:308.2403 Density:1.79 g/cm3 Melting Point:247C Boiling Point:661 C at 760 mmHg Flash Point:255.1 C Solubility: Soluble in methanol or benzene; insoluble in water. Appearance: Yellow crystalline solid. Here are two more views of the molecule.  HYPERLINK "javascript:%20void%20window.open('../image/structurefly.cgi?cid=5359407&width=400&height=400',%20'StructureFly',%20'resizable=yes,%20scrollbars=yes,%20WIDTH=620,%20HEIGHT%20=%20620')"  INCLUDEPICTURE "http://pubchem.ncbi.nlm.nih.gov/image/imgsrv.fcgi?t=l&cid=5359407" \* MERGEFORMATINET   INCLUDEPICTURE "http://pubchem.ncbi.nlm.nih.gov/pc3d/pc3qm4.cgi?req=4893930636831798720&width=700&height=700&atm=-80&cnf=0&axis=y&steps=12" \* MERGEFORMATINET  ( HYPERLINK "http://pubchem.ncbi.nlm.nih.gov/vw3d/vw3d.cgi?cmd=crtvw&reqid=4893930636831798720#" http://pubchem.ncbi.nlm.nih.gov/vw3d/vw3d.cgi?cmd=crtvw&reqid=4893930636831798720#) Comparing this structure to the one in the article for a sample humic acid structure, it is easy to see how much simpler this molecule is than humic acid. The structure below represents a humic acid monomer, a building block for actual humic acid structures.  HYPERLINK "http://www.geochemicaltransactions.com/content/1/1/10/figure/F4?highres=y"  INCLUDEPICTURE "http://www.geochemicaltransactions.com/content/figures/1467-4866-1-10-4.jpg" \* MERGEFORMATINET  ( HYPERLINK "http://www.geochemicaltransactions.com/content/1/1/10/figure/F4?highres=y" http://www.geochemicaltransactions.com/content/1/1/10/figure/F4?highres=y) Looking at the table below, from Wikipedia, one can see the specific concentrations associated with the various ions found in the Amazon and Rio Negro. The first six ions, all in mg/L concentrations, are significantly lower (from approximately one-half to one-tenth) in the Rio Negro than in the Amazon. These are the ions mentioned in the article that are needed by fish and other animals and plants for continued growth. Without these ions, plant life along and animal life along and within the Rio Negro are less abundant and diverse. According to the table, the only ions with higher concentration in the Rio Negro than the Amazon are aluminum, iron, manganese and zinc. The conductivity of the Amazon, at 57 S/cm, is about six times higher than that of the Rio Negro (9 S/cm). This one variable succinctly describes the difference in ion concentration in the two rivers. The humic acids in the Rio Negro water bind to the Group I and II elements ions, almost depleting them from the water. The conductivity of this water is not much greater than that of rainwater. (The electrical conductivity of rainwater varies widely, from about 0.01-0.05 dS/m, or 10-50 S/cm.) Table 1: Mean ionic composition, specific  HYPERLINK "http://en.wikipedia.org/wiki/Electrical_conductivity" \o "Electrical conductivity" conductivity (S/cm), and  HYPERLINK "http://en.wikipedia.org/wiki/PH" \o "PH" pH in  HYPERLINK "http://en.wikipedia.org/wiki/Amazon_River" \o "Amazon River" Amazon waters. HYPERLINK "http://en.wikipedia.org/wiki/Blackwater_river" \l "cite_note-Darwich-2" [3] HYPERLINK "http://en.wikipedia.org/wiki/Solimoes_River" \o "Solimoes River" Solimoes or  HYPERLINK "http://en.wikipedia.org/wiki/Amazon_River" \o "Amazon River" Amazon River whitewater. HYPERLINK "http://en.wikipedia.org/wiki/Rio_Negro_(Amazon)" \o "Rio Negro (Amazon)" Rio Negro blackwater. HYPERLINK "http://en.wikipedia.org/wiki/Sodium" \o "Sodium" Na (mg/L)2.3 0.80.380 0.124 HYPERLINK "http://en.wikipedia.org/wiki/Potassium" \o "Potassium" K (mg/L)0.9 0.20.327 0.107 HYPERLINK "http://en.wikipedia.org/wiki/Magnesium" \o "Magnesium" Mg (mg/L)1.1 0.20.114 0.035 HYPERLINK "http://en.wikipedia.org/wiki/Calcium" \o "Calcium" Ca (mg/L)7.2 1.60.212 0.066 HYPERLINK "http://en.wikipedia.org/wiki/Chlorine" \o "Chlorine" Cl (mg/L)3.1 2.11.7 0.7 HYPERLINK "http://en.wikipedia.org/wiki/Silicon" \o "Silicon" Si (mg/L)4.0 0.92.0 0.5 HYPERLINK "http://en.wikipedia.org/wiki/Strontium" \o "Strontium" Sr (g/L)37.8 8.83.6 1.0 HYPERLINK "http://en.wikipedia.org/wiki/Barium" \o "Barium" Ba (g/L)22.7 5.98.1 2.1 HYPERLINK "http://en.wikipedia.org/wiki/Aluminum" \o "Aluminum" Al (g/L)44 37112 29 HYPERLINK "http://en.wikipedia.org/wiki/Iron" \o "Iron" Fe (g/L)109 76178 58 HYPERLINK "http://en.wikipedia.org/wiki/Manganese" \o "Manganese" Mn (g/L)5.9 5.19.0 2.4 HYPERLINK "http://en.wikipedia.org/wiki/Copper" \o "Copper" Cu (g/L)2.4 0.61.8 0.5 HYPERLINK "http://en.wikipedia.org/wiki/Zinc" \o "Zinc" Zn (g/L)3.2 1.54.1 1.8 HYPERLINK "http://en.wikipedia.org/wiki/Electrical_conductivity" \o "Electrical conductivity" Conductivity57 89 2 HYPERLINK "http://en.wikipedia.org/wiki/PH" \o "PH" pH6.9 0.45.10.6Total  HYPERLINK "http://en.wikipedia.org/wiki/Phosphorus" \o "Phosphorus" P (g/L)105 5825 17Total  HYPERLINK "http://en.wikipedia.org/wiki/Carbon" \o "Carbon" C (mg/L)13.5 3.110.5 1.3 HYPERLINK "http://en.wikipedia.org/wiki/HCO3" \o "HCO3" HCO3-C (mg/L)6.7 0.81.7 0.5 ( HYPERLINK "http://en.wikipedia.org/wiki/Blackwater_river" http://en.wikipedia.org/wiki/Blackwater_river) On the same web page, above, you can find a list of about 50 other rivers in the world that are considered black water rivers, like the Rio Negro. The US seems to have more than its fair share, as the list includes more than 25 rivers in the southern United States! More on the Amazon River basin Sir Alfred Wallace, of biology and evolution fame, explored the Rio Negro area in 1853, and wrote a journal with this excerpt, along with a detailed map (scanned on the siteperhaps from the original map?) of Rio Negro basin area from that time:  HYPERLINK "http://people.wku.edu/charles.smith/wallace/S011.htm" http://people.wku.edu/charles.smith/wallace/S011.htm. In the journal record, he notes his surprise at the black waters of the Rio Negro. He also notes the different colors of other rivers and streams in the same area, varying from colorless to pale brown to a slight olive tint, to the jet black (looking down through the depths) of Rio Negro. Even then, though, the cause of the dark water was attributed hypothetically to decay of organic matter. These various-coloured waters may, we believe, readily be accounted for by the nature of the country the stream flows through. The fact that the most purely black-water rivers flow through districts of dense forest, and have granite beds, seems to show that it is the percolation of the water through decaying vegetable matter which gives it its peculiar colour. There is much ambiguity about the actual origin of the Amazon River, depending on which South American country you are in, and even which area of each country that borders the Amazon. Some say it is the actual confluence of the Rio Negro and Rio Solimes at Manaus that begins the Amazon, while others say the Amazon begins way up in the Peruvian Andes. These differences of opinion are more political or geographic than scientific. In December of 2000, using sophisticated GPS equipment, a five-nation team from the National Geographic Society scientifically located the source as water falling from a high cliff in the Peruvian Andes, on a slope of Nevado Mismi in southern Peru. Prior to this expedition, several other mountains in the same area of Peru had been in contention for the title of source of the Amazon. (Source:  HYPERLINK "http://news.nationalgeographic.com/news/2000/12/1221amazon.html" http://news.nationalgeographic.com/news/2000/12/1221amazon.html) The Amazon had long been established as the largest river in the world, with a discharge volume of water greater than the next ten largest rivers combined, and the Nile had long (for centuries) been touted as the longest river (with the Amazon coming in a very close second). But establishing the actual length of a river is a difficult task, as sources are hard to find and sometimes change with rainy or dry seasons. A bone of contention for geographers, cartographers and the like has been establishing which is the longest riverthe Amazon or the Nile. The length of the Nile has been established at lengths varying from 4,160 miles (6,695 km) to 4,328 miles (6,825 km), according to the National Geographic Society, making it longer than the Amazon, at 4,000 miles (6,437 km), by 160 to 328 miles (256 to 525 km). With the discovery of the Nevado Mismi farthest source of the Amazons waters, however, the Amazons length has now been pegged at distances from 4,225 miles (6,800 km) to 4,345 miles (6,952 km) long, making the Amazon the longest river by a maximum of 17 milesa very close call, indeed! The debate continues (Source:  HYPERLINK "http://en.wikipedia.org/wiki/Amazon_River#Dispute_regarding_length" http://en.wikipedia.org/wiki/Amazon_River#Dispute_regarding_length) Note that the Mississippi comes in 4th worldwide, at 3,902 miles (6,275 km), behind the Yangtze, at 3,917 miles (6,300 km). (Not too shabby, eh?) The map below shows the Amazon River valley and the tributaries feeding the Amazon across South America. Although it doesnt pinpoint the source of the Amazon according to the National Geographic expedition, the Nevado Mismi is just beyond the southern end of the Apurimac River, far to the southwestern edge of Peru. You can control-click on the map to go the enlarged web version at Wikipedia.  HYPERLINK "http://en.wikipedia.org/wiki/File:Negroamazonrivermap.png" \o "Map showing the Rio Negro in the Amazon River basin."  INCLUDEPICTURE "http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Negroamazonrivermap.png/256px-Negroamazonrivermap.png" \* MERGEFORMATINET   HYPERLINK "http://en.wikipedia.org/wiki/File:Negroamazonrivermap.png" http://en.wikipedia.org/wiki/File:Negroamazonrivermap.png This map also shows where the Rio Negro joins the Amazon River, or Rio Solimes. The Rio Negro is highlighted in pink. It is the largest major tributary to join the Amazon from the north. You can just see Manaus at the confluence of the Rio Negro and the Amazonthe focus of this article. More on humic acid binding free ions Studies done in other countries attest to the chelating or binding powers of humic and fulvic acids for heavy metal ions, although some of these studies have been undertaken by companies that make and sell the products commercially. These two organic substances bind to lead, cadmium and mercury, in addition to the ions mentioned in the article. In high enough doses, these two organic acids can remove the ions from the body, but if they are present in smaller quantities, they can re-release the heavy metal ions back into the body. One problem that could arise from ingesting fulvic acids on a regular basis is that they can interfere with iron absorption because they form complexes with iron in the gastrointestinal tract. This could lead to anemia. More on the benefits of humates Humus is useful in soils to provide nutrients for plant growth. Humates are salts of humic substances that are sold by various companies as fertilizers for agriculture, and as food supplements for farm animals. They are also being sold as supplements for human consumption. The best source of humates for these purposes seems to be Leonardite, a mineral made of oxidized lignite. This mineral generally contains less fulvic acid and more humic acid, although the percentage of each can vary, depending on the source of the Leonardite. Connections to Chemistry Concepts (for correlation to course curriculum) Physical propertiesThe differences in physical properties (temperature, acidity, density, color) between the Rio Negro and the Amazon River are responsible for the lack of mixing of the two waters for such a long distance. DensityAlthough the higher temperature of the Rio Negro would seem to point to a lower density for its waters relative to those of the Amazon, the Rio Negros higher dissolved organic material content causes its waters to be more dense than those of the Amazon. Solution/SuspensionMost of the organic substances in the Rio Negro that reach the Amazon are in solution, while those that were in suspension settled out and raised the level of the Rio Negro, thus slowing its flow. Acids and basesThe Rio Negro is acidic (low pH) due to the decayed plant materials (humic and fulvic acids) dissolved in its waters. Bronsted-Lowry AcidsOrganic acids like humic and fulvic acids are proton-donors through their COOH functional groups. SolubilityThe various components of humic substances exhibit varying degrees of solubility over various pH ranges. PolymersThe varieties of organic humic and fulvic acids are all macromolecular (polymer) compounds with oxygen-containing functional groups. Organic acidsHumic and fulvic acids are examples of organic acids, with the COOH functional group. Possible Student Misconceptions (to aid teacher in addressing misconceptions) That these two rivers dont mix isnt such a big deal; its long been known that where rivers dump into the ocean the river water flows out to sea for quite some distance before it mixes completely with the ocean. While its true that river water doesnt mix easily with ocean water where the two first meet, this is due to the large difference in salinity and therefore density between fresh water from a river and salt water from the ocean. Ocean water can be approximately 3% more dense than fresh water, and this density difference keeps river water on top and prevents the two from mixing, as long as the horizontal flow of river water maintains sufficient velocity. When the velocity of the river water decreases, more mixing takes place. Normally, when two rivers meet, salinity is not a factor, so their not mixing is a big deal. The Rio Negro is the only black water river in the world. More than 50 other black water rivers exist; Rio Negros claim to fame is that it happens to be the largest feeding into the Amazon and stays unmixed for such a long distance. Anticipating Student Questions (answers to questions students might ask in class) Do all rivers when they meet behave the way that the Amazon and Rio Negro do? These two rivers are somewhat unique in that their merging but not mixing is very visible due to the great differences in their properties (clarity, color, and density), their size, and the fact that they stay unmixed for so long. Other rivers may also merge but not mix, but their remaining independent for long distances is not nearly as obvious. (See More on the confluence of the Clearwater and Snake Rivers in Idaho in the More on mixing of earths waters section above.) Temperature and salinity differences are the major properties that influence mixing in large bodies of water. Salinity is obviously a major concern where rivers dump into the ocean. Why is the Rio Negro a black water river? The Rio Negro contains runoff from the land along its banks. When the rainy season occurs, much of the dead plant vegetation is washed into the river. If the Rio Negro is warmer than the Amazon, why isnt the water of the Rio Negro less dense than that of the Amazon? (Thats what I learned about density in science classes.) While its true that density in liquids decreases with increased temperature, apparently the amount of dissolved organic matter in the Rio Negro increases the density of that water sufficiently to overcome the decreased density due to the higher temperature, resulting in an overall greater density of the water of the Rio Negro relative to that of the Amazon water. In-class Activities (lesson ideas, including labs & demonstrations) You can show the lack of mixing of two different water layers, one simulating fresh water and the other simulating ocean water, in an aquarium. See Density-Driven Currents at  HYPERLINK "http://www.usc.edu/org/cosee-west/Aug08/DensityDrivenCurrents.pdf" http://www.usc.edu/org/cosee-west/Aug08/DensityDrivenCurrents.pdf for a description of the set-up and procedure. The demonstration is done in the context of earth science and rivers and oceans. A discrepant event that can illustrate a Cartesian diver (density differences) as well as the effect of temperature on density is the following, taken from the February, 2001 issue of the Teachers Guide that accompanies ChemMatters. (All Teachers Guides are available online at  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters.) Note that it is best to try this demonstration only if students have seen a real Cartesian diver and understand how it works; otherwise they wont understand what they observe. A good discrepant event demo, (obtained from Richard Fraziers Web site) can be set up the following way. Make a [Cartesian] diver that is simply a test tube with an air bubble inside. Adjust the size of the air bubble so the diver just sinks when in ice water. Take a small vial with a rigid, watertight cap. Add water, sand, or lead shot to the vial so it just barely floats when sealed and placed in ice water. Put both divers in ice water and allow the water to warm. As the water warms, at some point they will swap positions! What is happening, of course, is that we are looking at two different phenomena. The test tube is truly a Cartesian diver. As the water warms, the gas expands and the volume occupied by the diver increases. This increases the buoyant force on the diver, so it rises. The sealed vial is not a diver. It is a sealed system with a density just below that of cold water. As the water warms, the waters density decreases. At some point the density of the vial becomes greater than the density of the warm water, so it sinks. There is no diver aspect to this phenomenon other than that of relative densities. For example, the vial would not sink if you squeezed the bottle. You can demonstrate the density difference between a sugared soda and a diet soda by putting a can of each in a larger container of water and observe that one will sink and one will float. An article by Bob Becker describing this for students to do as an activity can be found in the October, 2004 issue of ChemMatters, on page 4. The article begins with a discussion of why schools are banning soda machines. The next page includes a lab experiment for students to investigate the sugar content of various beverages. The density of the soda varies for the same reason as the waters of the Rio Negroincreased concentration of dissolved substances in the water. (The article is available on the ChemMatters 25-year CD; see the References section, below. It is also available online at  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters.) A lab activity to separate recyclable polymers based on their densities is described in the October, 1994 issue of the Teachers Guide for ChemMatters. Its available online, see  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters. To make a seven-layer density tower, visit the Steve Spangler Science web site at  HYPERLINK "http://www.stevespanglerscience.com/experiment/seven-layer-density-column" http://www.stevespanglerscience.com/experiment/seven-layer-density-column. This will illustrate to students how liquids may layer themselves due to density differences. For a very simplistic interactive activity that allows students to determine densities of various objects by measuring their mass and volume (by liquid displacement), see  HYPERLINK "http://ww2.unime.it/weblab/mirror/ExplrSci/dswmedia/density.htm" http://ww2.unime.it/weblab/mirror/ExplrSci/dswmedia/density.htm. Out-of-class Activities and Projects (student research, class projects) Students could research various sites that purvey humic and fulvic acids as health supplements and investigate their claims of improved health with the use of these two supplements. They could start with  HYPERLINK "http://www.humichealth.info/hungheavymetal.html" http://www.humichealth.info/hungheavymetal.html and  HYPERLINK "http://www.fulvic.org/html/nano_humic___fulvic__acid.html" http://www.fulvic.org/html/nano_humic___fulvic__acid.html. Students could investigate other areas in the world where waters of different physical properties meet, and report on them and the effects of their meeting. Several examples have been given in the Teachers Guide material. Advanced students could research the Kas and pKas of various organic acids and relate those values to their acid strengths. Students could research further the types of flora and fauna that reside near and in the Rio Negro and compare that to the flora and fauna of the Amazon River basin and relate that to the pH of the waters. Students can investigate the biological and chemical needs of fish and other aquatic life for the cations mentioned in the article. References (non-Web-based information sources)  Rohrig, B. Glass: More Than Meets the Eye. ChemMatters, October, 2006, 24 (3), pp 4-8. Part of this article describes the density of glass and its use in forensics investigations. The article includes a student lab activity to determine the density of glass. This article is also available online at the ChemMatters site, above. Becker, R. Cartesian DiversSqueeze Play. ChemMatters, February, 2001, 19 (1), pp 4-6. This article describes Archimedes discovery and shows students how to very his principle in the lab. It then describes Cartesian divers and how they work, based on density. Barnwell, G. Salt-Gradient Solar Ponds. ChemMatters, December, 1989, 7 (2), pp 12-15. The author describes the use of salt (NaCl) in pools or ponds to form a very dense system of salt-water in which circulation cells develop which are being used to generate electricity. The varying layers of salt-water become thermally separated based on density differences within the circulation cells. These thermal gradients are then used to generate electricity. McClure, M. Lava Lite Lamps: A Chemical Juggling Act. ChemMatters, April, 1997, 15 (4), pp 4-7. This article describes the workings of lava lamps. Although the two substances (the blobs and the surrounding liquid) are not soluble in one another (polar vs. non-polar liquids), these two liquids still exhibit the non-mixing of the liquid layers, and the movement of these layers due to temperature differences, similar to the Rio Negro and Amazon. Web Sites for Additional Information (Web-based information sources) More sites on the intersection of the two rivers Use Google Maps to see the meeting of the two rivers, just as the author describes them. Zoom in and follow the two rivers as they maintain their individual identities for kilometers downstream. You can see all this at  HYPERLINK "http://maps.google.com/maps?ftr=sv.seven&hl=en&layer=c&utm_campaign=en&utm_medium=mapshpp&utm_source=en-mapshpp-na-us-gns-svn&utm_term=7" http://maps.google.com/maps?ftr=sv.seven&hl=en&layer=c&utm_campaign=en&utm_medium=mapshpp&utm_source=en-mapshpp-na-us-gns-svn&utm_term=7. More sites on the source of the Amazon The National Geographic Society news site reporting the discovery of the source of the Amazon can be found here:  HYPERLINK "http://news.nationalgeographic.com/news/2000/12/1221amazon.html" http://news.nationalgeographic.com/news/2000/12/1221amazon.html. More sites on Rio Negro A few pictures on this travelogue site show you the color of the water of the Rio Negro. Native river dolphins, called boto, are in several of the photos, swimming in the river. You can see how the river water apparently changes their color with depth, from pale grey to rust color:  HYPERLINK "http://www.travelpod.com/travel-blog-entries/tiredandcranky/1/1283390577/tpod.html#pbrowser/tiredandcranky/1/1283390577/filename=3_novo-airao.jpg" http://www.travelpod.com/travel-blog-entries/tiredandcranky/1/1283390577/tpod.html#pbrowser/tiredandcranky/1/1283390577/filename=3_novo-airao.jpg. The dolphins apparently become pinker in color as they age. (perhaps as a result of their skin absorbing some of the tannins of the water?) Another video that shows the separation of the Rio Negro and Amazon River waters can be found here:  HYPERLINK "http://www.youtube.com/watch?v=0q_zr2FESVU&feature=player_embedded#" http://www.youtube.com/watch?v=0q_zr2FESVU&feature=player_embedded#. Entitled El Rio Amazonas, the narration is in Spanish, but the few seconds of aerial photos of the intersection of the two rivers is worth the 1-1/2 minute video. More sites on river water density River water changes the salinity of the ocean water (and therefore its density) as it flows into the ocean. A study of these effects at the mouth of the Hudson River as it dumps into the Atlantic Ocean can be found at  HYPERLINK "http://life.bio.sunysb.edu/marinebio/fc.1.estuaries.html" http://life.bio.sunysb.edu/marinebio/fc.1.estuaries.html. More sites on humic substances The Skeptical Aquarist web site contains several pages on dissolved organic materials. It is principally a site for aquarium enthusiasts, but it offers some good basic information on what is likely to be found in aquarium waters (not unlike river waters). ( HYPERLINK "http://www.skepticalaquarist.com/docs/water/orgpref.shtml" http://www.skepticalaquarist.com/docs/water/orgpref.shtml) Humintech.com is a German-based company that produces humates, material containing humic and fulvic acids, for sale to agriculture and animal feed companies. They offer information on their site about the role humates play in our ecology, stressing the benefits of humates. (Remember that their company sells humates.) Nevertheless, they do provide basic information about the content of humic matter. ( HYPERLINK "http://www.humintech.com/" http://www.humintech.com/) The March 13, 2006 issue of Chemical and Engineering News contains an article in their Latest News section, Nitrous Acid from Sun and Soil, that addresses the role that soil and humic acid in particular plays with sunlight in breaking down atmospheric nitrogen dioxide (NO2) into nitrous acid (HONO), a precursor to hydroxyl, a substance that oxidizes numerous pollutants in the atmosphere. You can access the article at  HYPERLINK "http://pubs.acs.org/cen/news/84/i11/8411notw4.html" http://pubs.acs.org/cen/news/84/i11/8411notw4.html. Here is a MSDS for humic acid:  HYPERLINK "http://www.lookchem.com/msds/2009-6/Humic%20acid.pdf" http://www.lookchem.com/msds/2009-6/Humic%20acid.pdf. A search for fulvic acid on ChemSpider chemical database resulted in almost 300 similar compounds being identified as fulvic acids. ( HYPERLINK "http://www.chemspider.com/Search.aspx?rid=84a253d3-084e-4143-aacd-ec4064c149f7" http://www.chemspider.com/Search.aspx?rid=84a253d3-084e-4143-aacd-ec4064c149f7) A study done at the Public University of Navarra, in Spain, shows that fulvic acid forms aggregates of molecules that are more stable than the basic molecule. Several different models of the molecules are illustrated in the paper. ( HYPERLINK "http://hera.ugr.es/doi/16519401.pdf" http://hera.ugr.es/doi/16519401.pdf) More sites on blackwater rivers Wikipedia provides information and links to other blackwater rivers worldwide at  HYPERLINK "http://en.wikipedia.org/wiki/Blackwater_river" http://en.wikipedia.org/wiki/Blackwater_river. More sites on the beneficial effects of humic & fulvic acids HumicHealth.info provides information on various studies that have been done to show the chelating capabilities of these organic acids for heavy metal ions in people exposed to heavy metal contamination. Unfortunately, no sources are cited. (Keep in mind that the company produces these acids for sale.) ( HYPERLINK "http://www.humichealth.info/hungheavymetal.html" http://www.humichealth.info/hungheavymetal.html) A study done by four French scientists from Universit Rennes provides data that shows that humic and fulvic acids in soils do indeed complex rare earth elements. The effects vary with pH; high pH results in greater complexation than low pH. This has implications for removal of rare earth elements from organic-rich river water and from groundwater. ( HYPERLINK "http://hal-insu.archives-ouvertes.fr/docs/00/18/00/39/PDF/PL01805.pdf" http://hal-insu.archives-ouvertes.fr/docs/00/18/00/39/PDF/PL01805.pdf) Providing Hope, Finding Cures Background Information (teacher information) More on Elion Gertrude Belle Elion was born on January 23, 1918, in New York City. Both of her parents immigrated to the United States when they were in their teensher father Robert from Lithuania and her mother Bertha from that part of Russia which is now Poland. Her father was a dentist and her mother a seamstress. He had to work his way through dental school at New York University. Once established as a successful dentist, Elions father became wealthy by investing in real estate. Both of her parents valued education, and fostered the school work of Elion and her younger brother Herbert. The family lived in Manhattan until Elion was seven, when they moved to the Bronx. When Elion was three, her grandfather emigrated from Russia and came to live with the family in New York. He was a learned scholar and a watchmaker, and he became a major influence in Elions life. Elion graduated from high school in 1933, at the age of fifteen, and enrolled at Hunter College. At the time, Hunter College was the womens division of City College of New York. It was also tuition-free, important for Elion since her father was forced into bankruptcy by the stock market crash and the Great Depression. In that same year her grandfather was diagnosed with stomach cancer and died. When it came time for Elion to choose a major at Hunter College, she chose chemistry, she said, so that, remembering her grandfather, she could find a cure for cancer. She graduated Phi Beta Kappa from Hunter and received her bachelors degree in chemistry in 1937. She applied to fifteen graduate schools but because she was not offered financial aid at any of them, Elion went job-hunting. Neither she nor her family had recovered from the financial losses due to the Depression. She enrolled in secretarial school but quickly abandoned that when she was offered a job teaching biochemistry to nursing students at NYU. Elion then worked for several chemical companies. Among her routine jobs as an analytical chemist for the Quaker Maid company food lab, Elion checked the color of mayonnaise, tested the acidity of pickles and mold on fruit. She saved up enough to pay her graduate school tuition and took night classes at New York University. She earned her masters degree in chemistry in 1941. A job with Johnson & Johnson in New Brunswick, N.J. followed, but, as the article says, it was short-lived since the company shut down its research facility barely six months after she began working there. The jobs in the chemical industry were available to her only because, by 1941, the United States had entered World War II and many of the men who had held jobs in industry had enlisted or were drafted. Another fatal illness affected Elions personal life during this time period. In 1937 Elion fell in love with a young man named Leonard Canter, a statistics major who went to work for Merrill Lynch after graduation. They planned to marry, but the young man died of subacute bacterial endocarditis. Had penicillin been widely available at the time, it would have cured him, but the drug did not become available until about 1941, a full two years after his death. Elion never married. His death reinforced her feeling, after the death of her grandfather, that it was important for her to find cures for diseases like cancer and endocarditis. Soon after leaving Johnson and Johnson in 1944, Elion landed an interview at Burroughs Wellcome (now GlaxoSmithKline) in Tuckahoe, New York. Lab director Dr. George Hitchings interviewed Elion, and it was the beginning of a professional relationship that would lead to a Nobel Prize in 1988. Elion wanted to earn a Ph. D. degree and enrolled at Brooklyn Polytechnic Institute part time. After two years of classes, Elion was told that she would have to enroll full time, which would have meant giving up her new job at Burroughs Wellcome. She opted to keep her job, a decision that eventually made her one of the very few Nobel Prize recipients without a Ph.D. Elion retired from Burroughs Wellcome in 1983, but retained the title of scientist emeritus. She remained an active advisor to her former employer, then known as Glaxo Wellcome, in North Carolina, and also to the World Health Organization and the American Association for Cancer Research. In 1990, Elion was elected to the National Academy of Sciences. In her Nobel autobiography she said of her hobbies, Over the years, my work became both my vocation and avocation. Since I enjoyed it so much, I never felt a great need to go outside for relaxation. Nevertheless, I became an avid photographer and traveler. Possibly my love for travel stems from the early years when my family seldom went away on vacation. Thus, my curiosity about the rest of the world did not begin to be satisfied until I began to travel. I have traveled fairly widely over the world, but there still remain many places for me to explore. Another major interest is music, not because I am musically talented, but because I love to listen to it. I am an opera lover and have been a subscriber to the Metropolitan Opera for over 40 years. I also enjoy concerts, ballet and theater.  HYPERLINK "http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html" http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html In 1999, Elion died in North Carolina at age 81. More on chemistry and cancer You might feel a little uncomfortable talking about cancer in a high school classroom. However, if you ask your class how many of them know someone who has or has had cancer, most, if not all, will raise their hand. The National Cancer Institute estimated that there were about 11 million people in the U.S. who had a history of cancer, and approximately 1.5 million new cases were predicted for 2009. According to the American Cancer Society, Cancer is the general name for a group of more than 100 diseases in which cells in a part of the body begin to grow out of control. Although there are many kinds of cancer, they all start because abnormal cells grow out of control . . . The body is made up of hundreds of millions of living cells. Normal body cells grow, divide, and die in an orderly fashion. During the early years of a person's life, normal cells divide faster to allow the person to grow. After the person becomes an adult, most cells divide only to replace worn-out or dying cells or to repair injuries . . . . Cancer cell growth is different from normal cell growth. Instead of dying, cancer cells continue to grow and form new, abnormal cells. Cancer cells can also invade (grow into) other tissues, something that normal cells cannot do. Growing out of control and invading other tissues are what makes a cell a cancer cell. Cells become cancer cells because of damage to DNA. DNA is in every cell and directs all its actions. In a normal cell, when DNA gets damaged the cell either repairs the damage or the cell dies. In cancer cells, the damaged DNA is not repaired, but the cell doesnt die like it should. Instead, this cell goes on making new cells that the body does not need. These new cells will all have the same damaged DNA as the first cell does. People can inherit damaged DNA, but most DNA damage is caused by mistakes that happen while the normal cell is reproducing or by something in our environment. Sometimes the cause of the DNA damage is something obvious, like cigarette smoking. But often no clear cause is found. In most cases the cancer cells form a tumor. Some cancers, like leukemia, rarely form tumors. Instead, these cancer cells involve the blood and blood-forming organs and circulate through other tissues where they grow. ( HYPERLINK "http://www.cancer.org/Cancer/CancerBasics/what-is-cancer" http://www.cancer.org/Cancer/CancerBasics/what-is-cancer) Descriptions of what we now know were cancer date back to Egypt in 1600 B.C. The word cancer was first used by Hippocrates (460-370 B.C.) He used the terms carcinos and carcinoma to describe tumors. Galen, a Roman physician, first used the term oncos (meaning swelling in Greek). During the Renaissance physicians developed a better sense of human physiology. In the 18th century physicians began to do more autopsies in order to determine cause of death. The Scottish surgeon John Hunter advocated the removal of tumors that had not invaded nearby tissue. Theories about the causes of cancer have changed throughout history. Hippocrates believed it was due to an imbalance in the bodys four humors. The humoral theory was replaced by the belief that it was the result of decaying lymph fluid. Cancer and cells were linked in the early 1800s but it was thought that cancer spread like a liquid. In the 1700s and 1800s it was believed that cancer was contagious. In about 1865 a German surgeon showed that cancer metastasized by the spread of malignant cells. At the turn of the 20th century, trauma was thought to be the cause. In 1868, Friedrich Meischer first isolated nuclei from cells and found that the nuclei contained a phosphorus compound (we now know that it was DNA). By the time Gertrude Elion began her work with George Hitchings at Burroughs Wellcome in 1944, it was known that DNA provided the genetic code for cells, but Watson and Crick had not yet made their important double helix discovery and would not do so until nine years later. Oswald Avery had recently discovered that nucleic acids were part of DNA, and carried genetic information. It was known that cancer could be caused by radiation, chemicals and viruses. Chemists had developed some anti-cancer drugs like the nitrogen mustards- cyclophosphamide, chlorambucil, methchlorethamine and uramustine. Elion and Hitchings were among the first to develop what has become known as targeted therapy or rational drug design. Shortly after World War II, Sidney Farber at Harvard Medical School learned that folic acid was essential for DNA metabolism, and that analogues of folic acid could be used to interrupt that metabolism (this is the research that led to what is now the anti-cancer drug methotrexate). Farber collaborated with Joseph Burchenal at Memorial Sloan Kettering Cancer Center and Burchenal, in turn, worked with Elion and Hitchings at about the same time. The strategy they used was to modify a chemical that a cell required for cell division. The chemical modification was only slightonly an atom or two in many casesso that the new chemical had a structure sufficiently like the original and was close enough to the original to fool the cell into using the modified chemical. However, the modified chemical would act differently than the original and the cell division it was needed for would be aborted. The cell would die. Elion and Hitchings used this approach to destroy cancer cells. Much of their work studied how cancer cells were different from normal cells and how to exploit the differences chemically to prevent cancer cells from growing. In the autobiography she wrote for the Nobel Prize, Elion said, The work became fascinating almost from the very beginning. We were exploring new frontiers, since very little was known about nucleic acid biosynthesis or the enzymes involved with it. I had been assigned quite early to work on the purines and, with the exception of a few deviations into the pteridines and into some other condensed pyrimidine systems, the remainder of my work concentrated almost completely on the purines. Each series of studies was like a mystery story in that we were constantly trying to deduce what the microbiological results meant, with little biochemical information to help us. Then, in the mid-1950's came the work of Greenberg, Buchanan, Kornberg and others which elucidated the pathways for the biosynthesis and utilization of purines, and many of our findings began to fall into place. When we began to see the results of our efforts in the form of new drugs which filled real medical needs and benefited patients in very visible ways, our feeling of reward was immeasurable.  HYPERLINK "http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html" http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html This approach led Elion to produce diaminopurine, mentioned in the article, and thioguanine, used to treat leukemia. Diaminopurine worked well in bacteria and human testing, but it had a serious side effectpatients became anemic and subject to infection. Elion then produced 6-mercaptopurine by replacing one oxygen atom on the guanine structure with a sulfur atom. This new compound was marketed as Purinethol, and was successful in treating leukemia.  In her Nobel lecture, Elion described the process that led to 6-mercaptopurine becoming and anti-cancer drug: After some animal toxicology studies by Philips et al., Burchenal proceeded rapidly to clinical trial with 6-mercaptopurine (6-MP) in children with acute leukemia. At that time the only drugs available for the treatment of these terminally ill children were methotrexate and steroids, and the median life expectancy was between 3 and 4 months; only 30% lived for as long as one year. The findings that 6-MP could produce complete remissions of acute leukemia in these children, although most of them relapsed at various intervals thereafter, led the Food and Drug Administration to approve the drug for this use in 1953, a little more than two years after its synthesis and microbiological investigation.  HYPERLINK "http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-lecture.pdf" http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-lecture.pdf Hitchings and Elion continued to employ their approach of modifying naturally-occurring chemical compounds in order to fool the body into taking up the analogues. Elion continued to focus on modifying purine-related compounds. Among these new drugs was azathioprine, a modified form of 6-mercaptopurine. It was used to suppress the human immune system after organ transplants. Allopurinol was another new drug used to treat gout. Other drugs discovered by Elion and her group include pyrimethamine (Daraprim and Fansidar) a treatment for malaria, and trimethoprim (Bactrim and Septra) for urinary and respiratory tract infections. Elion also developed new anti-viral drugs like acyclovir which blocked the herpes virus. Colleagues working in Elions lab continued her anti-viral research after her retirement in 1983 and developed AZT, the first drug licensed in the U. S. to treat HIV. More on DNA, pyrimidines and purines Many of your students will know that DNA, or deoxyribonucleic acid, is the genetic memory of the cell. However, they may tend to forget that DNA is, in fact, a chemical substance, a very large molecule, with a well-known structure. The DNA molecule is actually a polymer in the shape of a double helix. The chemical units within the polymer are called nucleotides. Each nucleotide has three componentsa five-carbon sugar called deoxyribose, a phosphate group and a nitrogenous base. There are only four basesthymine, cytosine, adenine, and guanine (often abbreviated T, C, A, and G.) These bases are the cells memory. They control how the cell manufactures enzymes and proteins. The four compounds have official chemical names: Adenine is 6-amino purine Guanine is 2-amino-6-oxypurine Thymine is 2, 4-dioxy-5-methyl pyrimidine Cytosine is 2-oxy-4-amino pyrimidine The bases are connected to the sugar part of the molecule and it is these bases that connect the two strands of the polymer. Adenine always bonds to thymine, and cytosine bonds with guanine by mean of hydrogen bonding. If the two polymer strands were thought of as a ladder, the base pairs would be the rungs. The pairing of the bases causes the DNA molecule to be twisted into the helical shape. This is because thymine and cytosine are chemically in a class of compounds called pyrimidines. Their basic structure consists of a ring of carbon atoms called an aromatic structure. Adenine and guanine are both purine compoundsa combination of a six-member ring and a five-member ring.  Purine structure Pyrimidine structure Guanine is a purine derivative. Its molecular formula is C5H5N5O (structural formula above). This structure consists of a fused pyrimidine-imidazole ring system with conjugated double bonds. The molecule is planar. So, in the DNA molecule, a pyrimidine always bonds with a purine. If purines bonded with purines, because of the larger size of the purine molecules, the smaller pyrimidines would not be able to reach each other to bond. So the combinations are always adenine and thymine, and cytosine and guanine. In addition, the pyrimidine rigs are planar but the purine rings have a slight pucker to them. This difference is what gives DNA its helical shape. There are two hydrogen bonds between adenine and thymine and there are three hydrogen bonds between guanine and cytosine. The fact that the base pairs are bound by weaker hydrogen bonds means that it is relatively easy for the two strands of the helix to separate. More on functional groups One way of thinking about organic compounds, like those described in the article, is to think about unique groupings of atoms that make up many organic compounds. These unique groupings are called functional groups. There are dozens of these. Some examples: Alkyl groups derived from alkane hydrocarbons. When these are connected to other functional groups they are often denoted as R-. Examples: Methyl: CH3 Ethyl: CH2CH3 Propyl: CH2CH2CH3  Alcohol group OH Aldehyde group  Ketone group Carboxylic acid group Amine group R NH2 There are many other functional groups, and most high school chemistry textbooks cover these in some detail. Functional groups can be thought of as parts of chemical compounds, parts that are attached (bonded) to some central structure. In the case of Elions work, we would look for any of these functional groups to be connected to the basic two-ring purine skeleton (shown above). The amine functional group is important in the Elion story because it was the amine functional groups that Elion added to the basic purine structure to create the her first anti-cancer drug, 6-diaminopurine. The structure of this compound appears in the article. Connections to Chemistry Concepts (for correlation to course curriculum) BiochemistryThis article is an excellent example of the role that chemistry plays in what most students know as a biological system. It provides you with an opportunity to remind your students about the central role that chemistry plays in living systems. Chemical ChangeThe ways in which Elion and colleagues modified the purines comes through clearly in this article. Students gain ample experience with the types of chemical changes listed in most texts (single replacement, double replacement, etc.) but to read about small changes in composition that change the properties of the substance should give them a new outlook on chemical change. Organic ChemistryFunctional groups play a pivotal role in the effectiveness of cancer drugs. This is a great way to relate these groups to real-world chemistry. History of ChemistryThis is a fascinating period in the history of science, especially in the realm of DNA-related research and chemotherapy. Most students will not have heard of Elion prior to reading the article, but the same can be said of many recipients of the Nobel Prize. It might be important to note to students that Elions Nobel award was for Physiology or Medicine, not Chemistry. What that should suggest to students is that chemistry is important in medicine as well as many other fields. Chemistry ResearchYou could have students read this article with an eye to the research methods used in Elions research. The approach that Elion and Hitchings took in finding differences between cancer cells and normal cells and then designing chemicals that hopefully affect cancer cells and not normal cells is among the first systematic approaches to drug discoverypioneering enough to merit a Nobel Prize. Possible Student Misconceptions (to aid teacher in addressing misconceptions) Gertrude Elion did not have a Ph. D. If I want to be a chemist do I have to have a Ph.D.? Many chemists earned Ph. D. degrees, but there are a wide variety of jobs in chemistry that do not require a Ph. D. degree. Anticipating Student Questions (answers to questions students might ask in class) Whats the difference between a cancer cell and a normal cell? The essential difference is that cancer cells do not stop reproducing. This rapid, out-of-control growth is what produces tumors, for example. Bacteria and viruses also reproduce rapidly. That is why cancer researchers like Elion test their drugs first on bacteria. If the drug stops bacterial cells from dividing, it might also stop human cancer cells from dividing. In addition, there are differences between cancer and normal cells at molecular level. Chemicals that control the cell cycle may be lost or altered. Cancer cells often lose molecules that reside on the cell surface. Genetic information gets lost in the rapid cell reproduction, and cancer cells never mature like normal cells. Why are functional groups so important? The article notes that these groupings of atoms are important in determining the properties of the compounds that they make up. The article says Adding different functional groups to CH3 changes the chemical properties of the whole compound. Like Elion, many cancer researchers substitute one functional group for another in the hope that the new molecule will have some of the same properties as the original but enough new properties to be considered a useful drug. In-class Activities (lesson ideas, including labs & demonstrations) Students can do a simulation on cancer detection by comparing diagrams of cancer cells with diagrams of normal cells. This activity is called Cancer Detectives: A Class Simulation and is described on the Chemical Heritage Foundation web site at  HYPERLINK "http://assets.chemheritage.org/classroom/class.html" http://assets.chemheritage.org/classroom/class.html. Note: This site is in transition at the time of publication. If you cannot find required information under Pharmaceutical Achieversor Cancer Chemotherapy, contact Gigi Naglak at  HYPERLINK "mailto:gnaglak@chemheritage.org" gnaglak@chemheritage.org or the webmaster at  HYPERLINK "mailto:webmaster@chemheritage.org%20%0a" webmaster@chemheritage.org to gain access. Designing chemicals for a specific purpose is often chemistrys aim. The Chemical Heritage Foundation has a chemistry lab on making esters with specific odors at  HYPERLINK "http://assets.chemheritage.org/EducationalServices/pharm/chemo/activity/ester.htm" http://assets.chemheritage.org/EducationalServices/pharm/chemo/activity/ester.htm You can register your class to enter UV data on the EPA site  HYPERLINK "http://www.epa.gov/sunwise/uvdata.html" http://www.epa.gov/sunwise/uvdata.html NOVA has a link to a cancer research activity about dosage at  HYPERLINK "http://www.pbs.org/wgbh/nova/teachers/activities/2805_cancer.html" http://www.pbs.org/wgbh/nova/teachers/activities/2805_cancer.html. You can isolate DNA via several general procedures. Here are two:  HYPERLINK "http://assets.chemheritage.org/EducationalServices/pharm/chemo/activity/isolat.htm" http://assets.chemheritage.org/EducationalServices/pharm/chemo/activity/isolat.htm and  HYPERLINK "http://learn.genetics.utah.edu/content/labs/extraction/howto/" http://learn.genetics.utah.edu/content/labs/extraction/howto/, or you can have your class try it virtually at  HYPERLINK "http://learn.genetics.utah.edu/content/labs/extraction/" http://learn.genetics.utah.edu/content/labs/extraction/. Out-of-class Activities and Projects (student research, class projects) Students can research foods that protect against cancer and foods that contribute to cancer on the American Institute for Cancer Research site:  HYPERLINK "http://www.aicr.org/site/PageServer?pagename=reduce_diet_getting_started" http://www.aicr.org/site/PageServer?pagename=reduce_diet_getting_started and prepare a cookbook of recipes containing helpful foods and eliminating harmful food. Student can research the factors that affect skin cancer, a type of cancer that should be of importance to teenagers. Some initial information can be found here  HYPERLINK "http://www.skincancer.org/Skin-Cancer-Facts/" http://www.skincancer.org/Skin-Cancer-Facts/, here  HYPERLINK "http://www.skincancer.org/quick-facts-about-teen-tanning.html" http://www.skincancer.org/quick-facts-about-teen-tanning.html, and here  HYPERLINK "http://www.time.com/time/magazine/article/0,9171,1927282,00.html" http://www.time.com/time/magazine/article/0,9171,1927282,00.html. Students can research the relationship between smoking and lung cancer. These two sites ( HYPERLINK "http://www.youngwomenshealth.org/smokeinfo.html" http://www.youngwomenshealth.org/smokeinfo.html and  HYPERLINK "http://www.lungusa.org/stop-smoking/about-smoking/facts-figures/children-teens-and-tobacco.html" http://www.lungusa.org/stop-smoking/about-smoking/facts-figures/children-teens-and-tobacco.html) provide useful information. Have students read and discuss in class the information about smokeless tobacco and cancer found here  HYPERLINK "http://www.cancer.gov/cancertopics/factsheet/Tobacco/smokeless" http://www.cancer.gov/cancertopics/factsheet/Tobacco/smokeless. Students can research other scientists who did work similar to Elions work. A partial list includes: Roy Calne, George Hitchings, Louis Goodman, Alfred Gilman, Cornelius Rhoads, Hamao Umezawa, Barnett Rosenberg, Robert Laing Noble, Charles Benton Huggins, Sidney Farber, Joseph Burchenal and Robert Schwartz. References (non-Web-based information sources) Ambrose, S., ed. Journeys of Women in Science and Engineering, Temple University Press, Philadelphia, PA. 1997, pp 135-139. Shearer, B.F. and Shearer, B.S. ed. Notable Women in the Physical Sciences: A Biographical Dictionary, Greenwood Press, Westport CT. 1997, pp 84-87 Ryan, J.F., ed. Luminaries of the Chemical Sciences, American Chemical Society, Washington, D.C. 2002, pp 101-1-2. Hargittai, I. Candid Science: Conversations with Famous Scientists, Imperial College Press, London, 2000, pp 55-71. Web Sites for Additional Information (Web-based information sources) More sites on Elions life and work Elion biographies can be found on the: National Academies of Science site  HYPERLINK "http://www.nap.edu/html/biomems/gelion.html" http://www.nap.edu/html/biomems/gelion.html Nobel Prize site  HYPERLINK "http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html" http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-autobio.html (an autobiography) Elion describes in details the chemistry of her research on the Nobel site  HYPERLINK "http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-lecture.pdf" http://nobelprize.org/nobel_prizes/medicine/laureates/1988/elion-lecture.pdf Jewish Womens Archive site  HYPERLINK "http://jwa.org/historymakers/elion/timeline" http://jwa.org/historymakers/elion/timeline Chemical Heritage Foundation site  HYPERLINK "http://www.chemheritage.org/" http://www.chemheritage.org/ Note: This site is in transition at the time of publication. If you cannot find required information under Gertrude Belle Elion, Pharmaceutical Achievers or Cancer Chemotherapy, contact Gigi Naglak at  HYPERLINK "mailto:gnaglak@chemheritage.org" gnaglak@chemheritage.org or the organizations webmaster at  HYPERLINK "mailto:webmaster@chemheritage.org%20%0a" webmaster@chemheritage.org to gain access. This article on Elion by Sharon Bertsch McGrayne originally appeared in The Chemical Educator:  HYPERLINK "http://chemeducator.org/sbibs/samples/spapers/11mcg897.htm" http://chemeducator.org/sbibs/samples/spapers/11mcg897.htm. To see two of Elions original papers on the development of acyclovir, see  HYPERLINK "http://www.jbc.org/content/253/24/8721.full.pdf+html" http://www.jbc.org/content/253/24/8721.full.pdf+html and  HYPERLINK "http://www.jbc.org/content/256/22/11447.full.pdf+html" http://www.jbc.org/content/256/22/11447.full.pdf+html. More sites on DNA and its structure A tutorial can be found on this University of Arizona site  HYPERLINK "http://www.blc.arizona.edu/molecular_graphics/dna_structure/dna_tutorial.html" http://www.blc.arizona.edu/molecular_graphics/dna_structure/dna_tutorial.html. Another tutorial can be found on the University of Utah site  HYPERLINK "http://learn.genetics.utah.edu/content/begin/tour/" http://learn.genetics.utah.edu/content/begin/tour/. Chemguide provides basic chemical information  HYPERLINK "http://www.chemguide.co.uk/organicprops/aminoacids/dna1.html" http://www.chemguide.co.uk/organicprops/aminoacids/dna1.html. More sites on cancer The following organizations have lots of cancer information on their web sites: American Cancer Society HYPERLINK "http://www.cancer.org/" http://www.cancer.org/ American Association for Cancer Research  HYPERLINK "http://www.aacr.org/" http://www.aacr.org/ American Institute for Cancer Research  HYPERLINK "http://www.aicr.org/site/PageServer" http://www.aicr.org/site/PageServer National Cancer Institute  HYPERLINK "http://www.cancer.gov/" http://www.cancer.gov/ For another perspective on the discovery of anti-leukemia compounds, see this page from Beyond Discovery at the National Academy of Sciences  HYPERLINK "http://www.beyonddiscovery.org/content/view.page.asp?I=292" http://www.beyonddiscovery.org/content/view.page.asp?I=292. More sites on purines The Purine Research Society provides information about purine metabolic diseases. ( HYPERLINK "http://www.purineresearchsociety.org/" http://www.purineresearchsociety.org/) This site connected to the University of Utah provides a great deal of purine chemistry information:  HYPERLINK "http://library.med.utah.edu/NetBiochem/pupyr/pp.htm" http://library.med.utah.edu/NetBiochem/pupyr/pp.htm. Chemical & Engineering News listed 6-mercaptopurine as one of the top 46 drugs that changed the world. AZT is also on the list. ( HYPERLINK "http://pubs.acs.org/cen/coverstory/83/8325/83256-mercaptopurine.html" http://pubs.acs.org/cen/coverstory/83/8325/83256-mercaptopurine.html) Putting Bacteria to Work Background Information (teacher information) More on fuel cells Besides the microbial Fuel Cell, (MFC) there is a variety of fuel cells that operate with different chemical environments as well as different fuel sources. The basic idea behind a fuel cell is that a fuel is continually flowing into the fuel cell structure in order to react in an oxidation-reduction reaction. Compared with a voltaic or galvanic electrochemical cell, commonly referred to as a battery (which is a misnomer for a single cell), a fuel cell will run as long as fuel is supplied whereas an electrochemical cell has a fixed quantity of reactants which eventually is depleted in a redox reaction, and a chemical equilibrium is reached (the dead battery situation). There are many different fuels, although most fuel cells use hydrogen. Other fuels containing hydrogen as part of a fuels molecular structure can be chemically treated to produce hydrogenexamples include methanol, ethanol, ammonia, diethyl ether, and formic acid, among others of interest. Some treatments to isolate the hydrogen occur within (or external to) the fuel cell itself which is called a reforming fuel cell. (See explanation of different types of reforming at  HYPERLINK "http://www.fuelcelltoday.com/media/pdf/education-kit/Fuel-Reforming.pdf" http://www.fuelcelltoday.com/media/pdf/education-kit/Fuel-Reforming.pdf.) The reactions in a reforming fuel cell for methanol include: Anode Reaction: CH3OH + H2O + 3O2- ! CO2 + 3H2O + 6e- Cathode Reaction: 3/2 O2 + 6e- ! 3O2- Overall Reaction: CH3OH + 3/2 O2 ! CO2 + 2H2O + electrical energy Those cell types that do not convert the fuel into hydrogen but use it directly are called direct fuel cells. More on the structure of a fuel cell The basic operation of a fuel cell (example, PEM or polymer electrolyte membrane) is shown below:  INCLUDEPICTURE "http://www1.eere.energy.gov/hydrogenandfuelcells/animation/images/fmodfuelcell.gif" \* MERGEFORMATINET  This illustration and a full description of the process of the PEM fuel cell, with printable text, can be found at  HYPERLINK "http://www1.eere.energy.gov/hydrogenandfuelcells/fc_animation_components.html" http://www1.eere.energy.gov/hydrogenandfuelcells/fc_animation_components.html. A fuel cell requires an input of fuel and a reacting environment that includes electrodes with catalysts for electron transfer and a barrier between the two redox-reacting areas (electrodes), usually some kind of membrane (polymer electrolyte or carbon cloth, for example). The membrane acts like a salt bridge in a normal voltaic electrochemical cellthat is, it allows for the movement of charged ions (in the case of hydrogen, the proton) but does not conduct electrons (they take the wire route). The anode is the electrode at which oxidation takes place. In the case of hydrogen, it loses an electron. The electrode, which is porous to allow for the flow of hydrogen through it, is composed of catalytic platinum particles uniformly distributed on a surface of carbon particles. The cathode, also porous, is where reduction takes place. If oxygen is involved at the cathode, it is reduced with the electrons given up by the hydrogen. Again the cathode has platinum incorporated into a matrix of carbon particles to act as a catalyst. Examining other types of fuel cells one finds that there are differences in the composition of the electrodes as well as the membrane environment. (Refer to the chart found in the US Department of Energy URL above.) Two other types of fuel cells that have been of general commercial interest since the 1960s include the Solid Oxide Fuel Cell (SOFC) and the Molten Carbonate Fuel Cell (MCFC). One of the factors that influence the choice of fuel cell type is the operating temperature. Some applications would require a higher operating temperature than room temperature and some the opposite, a lower operating temperature. The SOFC uses a variety of fuels besides hydrogen, including butane, methanol, and other petroleum products. The anode oxidizes a hydrocarbon or other organic molecule into CO2 and H2O while the cathode uses oxygen in the reduction process. The membrane used as an electrolyte is a solid called YSZ, (yttria-stabilized zirconia), which works well at high temperatures. In a molten carbonate fuel cell (MCFC), the electrolyte is a liquid (molten) carbonate which is a negative ion as well as an oxidizing agent. Since the carbonate changes chemically in the oxidation reaction, it has to be replaced. One of the simple ways to do that is to re-circulate the carbon dioxide gas created in the oxidation process, which is mixed with and reacts with incoming air at the cathode to form the carbonate ion again. An important issue for fuel cells is the development of byproducts, in this case carbon monoxide, that can chemically interfere with the operation of the fuel cell (referred to as poisoning) which is a problem for the more common type of fuel cell, the Proton Electrolyte Membrane or PEM type of fuel cell that uses pure hydrogen gas (reacting with oxygen). The SOFC and MCFC fuel cells avoid this problem because of their higher operating temperatures which utilize the carbon monoxide at the anode. In addition, steam that is produced at these higher temperatures at the anode forces the carbon monoxide to react with hydrocarbon fuels inside the anode (it is porous), producing more hydrogen for the fuel cell. This eliminates the need for an external reformer to first convert the hydrocarbons into hydrogen. One of the nice applications of the MCFC is to make use of the carbon dioxide emissions from coal fired power plants and gas turbine generators to produce additional electricity which raises the efficiency numbers for either of the generatorsanother twist on co-generation of electricity! And the steam generated can also be used in another application of co-generation of electricity through a steam-driven turbine, again increasing the efficiency for the original fuel (in the fuel cell operation). A Fuel Cell Industry news site with an education kit that explains the technology behind fuel cells including the fuel, fuel reforming, types of fuel cells available (2010), etc. can be found at  HYPERLINK "http://www.fuelcelltoday.com/community/education-kit;jsessionid=58BD84B9B8E36B941B755A1AAD507028" http://www.fuelcelltoday.com/community/education-kit;jsessionid=58BD84B9B8E36B941B755A1AAD507028. A site for updates on fuel cell technology can be found at  HYPERLINK "http://www.fuelcells.org/news/updates.html" http://www.fuelcells.org/news/updates.html. More on the history of fuel cells Although the fuel cell is a technology associated with the latter part of the 20th C and now part of the search for alternative energy sources in the 21st C, some of the original work on fuel cell research was done in the 19th C (1835-1845) by two pioneersWilliam Grove (England) and Christian Schoenbein (Switzerland). The first positive identification of the fuel cell effect appeared in the Philosophical Magazine of January, 1839, authored by Christian Schoenbein. Schoenbein is also the discoverer of ozone (the electrical smell) during his studies of the fuel cell effect and is credited with the development of gun cotton. William Grove followed with a publication in the same magazine one month later in which he described the electrical effect of combining hydrogen and oxygen using platinum electrodes. He later called this power source a gas battery. The two men are credited officially with inventing the fuel cell (Grove) and discovering how the fuel cell worked (Schoenbein). The two men carried on a lively and fruitful scientific conversation by letter over a 30 year period. In the course of his experiments, Grove actually constructed a series of fuel cells that were fueled by a hydrogen generator. One comprehensive reference on the work of Grove and Schoenbein with their extensive correspondence is found in the book, The Birth of the Fuel Cell (1835-1845) by Ulf Bossel (European Fuel Cell Forum, ISBN 3905592-06-1) It was with the development of the US Space Program in the late 1960s that the fuel cell once again came into the research and development spotlight. Researchers at Pratt and Whitney produced the Alkali Fuel Cell* (AFC) for use in space capsules and which is still used today. *(Francis Thomas Bacon of Cambridge England researched and developed the alkali electrolyte fuel cells during the late 1930s and early in WWII (for submarines). Post-war studies saw perfection of the alkali fuel cells, using KOH which was less corrosive to electrodes than acid environments. Bacons fuel cell technology was eventually licensed by Pratt and Whitney for the Apollo spacecraft program.) Present day details on the operation of the AFC in space craft is explained at  HYPERLINK "http://inventors.about.com/od/fstartinventions/a/fuel_cell_plant.htm" http://inventors.about.com/od/fstartinventions/a/fuel_cell_plant.htm . Connections to Chemistry Concepts (for correlation to course curriculum) Oxidation-ReductionAll the reactions that power fuel cells, regardless of the fuel involved, are oxidation-reduction reactions (redox). Half reactionsWhen describing redox reactions in fuel cells, the chemical reactions taking place are two half reactionsone is oxidation and the other, reduction. These two reactions take place in different physical locations. Exothermic reactionsThe chemical reaction in fuel cells is exothermic, with the transformation of the chemical potential energy of the reactants into the electromotive force (EMF or voltage) of the circuit. IonsThe redox reaction of fuel cells produces cations (from oxidation at the anode), ions that pass through a membrane to the cathode, while the electrons lost by the atoms forming the cations travel separately through a conductor (wire) to the same cathode area where reduction takes place. CatalysisBoth electrodes of a fuel cell (anode and cathode) catalyze the oxidation of the fuel molecules at the anode and the reduction of the reactants (ions and molecules) at the cathode. Electrochemical cellsFuel cells are electrochemical cells in which oxidation and reduction reactions take place at separate surfaces (electrodes) in which chemical energy of the reactants is converted to and evolved largely as electric energy. The physically separated reactants (half cells) require a wire to connect the electrodes for transfer of electrons involved in the redox reactions. There are two kinds of electrochemical cellsvoltaic (reactions spontaneous) and electrolytic (not spontaneous; require electrical energy). PolymersMany times, a membrane is used to separate the two half-cells of a fuel cell. Some of these membranes are made of a polymer electrolyte, which has a surface charge. ElectrolytesA fuel cell requires electrolytes between the anode and cathode for movement of ions, created at the two cathodes, and necessary for current flow. Electric charge is conducted through a solution or a gel by movement of cations and anions. Organic chemistryMolecules containing carbon, such as found in plant material and sewage used in microbial fuel cells, are the source of hydrogen atoms that undergo oxidation at the anode of the MFC. HydrocarbonsAnother fuel for microbial fuel cells, these molecules containing only hydrogen and carbon most often have their origins in petroleum. Possible Student Misconceptions (to aid teacher in addressing misconceptions) Fuel cells burn fuels. Burning means, in chemical terms, combustion, which is a redox reaction but generates both products and thermal energy. Fuel cells produce products also but generate mostly electrical energy rather than mostly heat. The electrodes in a fuel cell absorb ions. At an electrode surface during a redox reaction, a reactant such as a hydrogen molecule (H2) is adsorbed (rather than absorbed) where, in the presence of a catalyst, it loses electrons to become an ion that goes back into the electrolyte solution. Electrons can flow through an electrolyte solution. In conduction of electricity through an electrolyte solution, electrons themselves do not pass through the solution. When an ion is formed at either electrode in an electrochemical cell, a charge imbalance is created. This increase in positivity or negativity is countered by the movement of ions already in the solution, restoring charge balance in the solution. Water is a good conductor of electricity Chemically pure water is a poor conductor of electricity because the concentration of hydrogen ions (H+) and hydroxide ions (OH-) is very low (10 -7 M). Tap water is not pure water (not to be confused with bacteria free) and contains ions that will contribute to electrical conduction (not electron transfer). The water molecules themselves are not involved in conduction. Anticipating Student Questions (answers to questions students might ask in class) Why cant water be used as a fuel? Fuels release their energy by oxidation-reduction reactions with oxygen. Water cannot react further because it is already oxidized as much as possible without resorting to an endothermic reaction (think of the reaction equation for the oxidation of H2 with O2, reacting to form water as in a fuel cell). Do fuel cells go dead like regular electrochemical cells (batteries)? Fuel cells are so named because they need a continuous supply of fuel to operate. Regular cells (incorrectly called batteriesa battery is a series of cells connected together) operate through spontaneous redox reactions (when the circuit is completed) that create products and an electric current. Eventually the reactants are used up (a chemical equilibrium is reached) and the battery stops producing an electric current. A fuel cell stops producing an electric current when fuel stops flowing to the cell. Do fuel cells always require a liquid electrolyte medium between the electrodes? There are a number of differently designed fuel cells, including some that rely on solid electrolyte mediums. These are appropriately named solid oxide fuel cells (SOFC)! These types of fuel cells are used for large scale electricity generation, often in remote areas. Methane or natural gas is the fuel used for the source of hydrogen. These fuel cells are also the same types of cells originally used in the Space program starting back in 1960 and continue to be used not only for electricity but for a water supply for the astronauts (the water produced in the fuel cell reaction evaporates out of the fuel cell and is condensed for drinking). The SOFC also has the advantage of being able to use a variety of fuels, including hydrogen, butane, methanol and other petroleum products. In-class Activities (lesson ideas, including labs & demonstrations) You can set up various electrochemical (voltaic) cells to show the generation of an electric current (use of voltmeters to show the EMF potential of various combinations of metals as electrodes). This can be done on the microscale using filter paper (in place of individual beakers and a salt bridge), cut as a Maltese cross onto which are placed small pieces of various metals and their ionic solutions at the end of each limb plus a common metal at the center, such as lead and its solution. The paper arms are moistened with an electrolytic solution (sodium nitrate) to act as the salt bridge between metals. Leads from a voltmeter touch the common metal (lead) at the center of the cross and systematically one of the other metals at the end of a limb. Students read each voltage produced. From this list of voltages, one can construct an Eo chart with lead metal as 0 and all other voltages (+,-) ranked in order from lowest to highest (negatives below 0, positives above 0). Advanced Chemistry with Vernier has a lab activity for their probes that deals with measuring voltages of various metals and their solutions. Experiment 20, Electrochemistry: Voltaic Cells, can be found at  HYPERLINK "http://www.mcsoh.org/mhs/science/Hamman/AP%20Chemistry/APC-%20Unit%20pages/APC%20-%20Unit%2017%20pages/20%20Voltaic%20Comp.pdf" http://www.mcsoh.org/mhs/science/Hamman/AP%20Chemistry/APC-%20Unit%20pages/APC%20-%20Unit%2017%20pages/20%20Voltaic%20Comp.pdf. David Brooks Doing Chemistry web site also has a lab activity to measure relative conductivities of various metals, using a microscale well plate and a voltmeter. He provides data for the activity. You can find it at  HYPERLINK "http://dwb4.unl.edu/Chemistry/microscale/MScale30.html" http://dwb4.unl.edu/Chemistry/microscale/MScale30.html. You can show the operation of a fuel cell in a very simple manner. Using carbon electrodes in water with an acetic acid solution added for conductivity, attach a nine volt battery to the two electrodes to produce hydrogen and oxygen gas by electrolysis of the water. After several minutes, remove the battery from the electrodes and attach a MICRO ammeter to the two electrodes and note a flow of electricity which comes from the reaction between the oxygen and hydrogen gas originally produced. This particular procedure raises the issue of using energy to make energy! How is this process saving energy, so to speak? It suggests that one needs to find a source of energy for the original electrolysis to produce at least hydrogen (oxygen could come from the air) that is less expensive than electricity already generated by burning a fuel such as coal, oil, or natural gas. One of the answers is of course the use of biological waste as the source of hydrogen through bacterial digestion or the use of solar photovoltaics to initially produce the hydrogen through electrolysis of water. The process of bacterial decay or even fermentation, both of which can produce a fuel that could be used in a fuel cell, could be carried out in the lab. In particular, anaerobic decay of organic waste (try animal manure) can produce methane (natural gas). But be careful about trying to take off the methane to demonstrate the existence of the fuel through combustion. If it is in a closed, expandable container, positive pressure on the container to expel the gas through a glass delivery tube inserted into the opening of the container could be briefly ignited. But be careful! (Check references on the generation of methane gas through anaerobic decay of animal manure. See  HYPERLINK "http://www.motherearthnews.com/Renewable-Energy/1973-03-01/Modest-Experiment-in-Methane-Gas-Production.aspx?page=3" http://www.motherearthnews.com/Renewable-Energy/1973-03-01/Modest-Experiment-in-Methane-Gas-Production.aspx?page=3 as an example and a YouTube video showing the set-up for a small scale generator at  HYPERLINK "http://www.youtube.com/watch?v=54S42xf80b4" http://www.youtube.com/watch?v=54S42xf80b4). The use of fermentation to produce ethyl alcohol is easily shownstudents set up a reaction mixture of water, sugar (sucrose) and yeast in a flask with a delivery tube into water to keep oxygen from entering the reaction vessel. There is a lot of chemistry here that students could experience, including the testing of the gas that is produced (carbon dioxide, tested with lime water added to the water into which the gas flows). The final product, ethyl alcohol, can be isolated by simple distillation and tested for flammability (paper soaked in the alcohol). Students could also test a number of variables that affect rate of fermentation, including pH, temperature, type of substrate (type of sugar), and others. If you have lab interfacing equipment (e.g., Vernier, Pasco), the rate of the reaction can be recorded by measuring the increase in pressure of the gas generated which can then be graphed. There are fuel cells of the PEM-type available for purchase through your standard chemistry supply companies for which students can generate electricity from a fuel cell that directly operates an electrical device such as a battery-powered miniature vehicle. The US Department of Energys Energy Efficiency & Renewable Energy Web site contains classroom materials to teach about hydrogen and fuel cells. H2 Educate! Has both teacher and student versions of their pdf documents (24 and 28 pages, respectively), which contain student activities and audio-visual materials for teachers. You can find the materials at  HYPERLINK "http://www1.eere.energy.gov/hydrogenandfuelcells/education/classroom_materials.html#lesson" http://www1.eere.energy.gov/hydrogenandfuelcells/education/classroom_materials.html#lesson. There is growing interest in the use of urine to power a fuel cell. This topic alone might capture student interest as a starter! It is actually the urea in urine that is of interest here. Urea in urine is the source of hydrogen for a fuel cell; electrolysis separates the hydrogen from the nitrogen in the urea molecule, using a nickel-based electrode. This particular electrolysis requires less energy than that needed for electrolysis of water (0.37 V vs. 1.23 V). The following web references are good starting points for student research:  HYPERLINK "http://www.eps.hw.ac.uk/departments/chemistry/youtricity.htm" http://www.eps.hw.ac.uk/departments/chemistry/youtricity.htm,  HYPERLINK "http://www.suite101.com/content/urine-could-be-used-to-create-green-electricity-a276321" http://www.suite101.com/content/urine-could-be-used-to-create-green-electricity-a276321,  HYPERLINK "http://fuelcellsworks.com/news/2009/07/06/urine-turned-into-hydrogen-fuel/" http://fuelcellsworks.com/news/2009/07/06/urine-turned-into-hydrogen-fuel/ ,  HYPERLINK "http://www.associatedcontent.com/article/5604390/recycling_stale_urine_electrolytic.html?cat=15" http://www.associatedcontent.com/article/5604390/recycling_stale_urine_electrolytic.html?cat=15, and  HYPERLINK "http://www.rsc.org/publishing/journals/EE/article.asp?doi=b924786f" http://www.rsc.org/publishing/journals/EE/article.asp?doi=b924786f. For the ambitious student, there are directions for constructing a two-chamber microbial fuel cell at  HYPERLINK "http://www.instructables.com/id/Simple-Algae-Home-CO2-Scrubber-Part-III-An-Algae/" http://www.instructables.com/id/Simple-Algae-Home-CO2-Scrubber-Part-III-An-Algae/,  HYPERLINK "http://www.instructables.com/id/Make-a-Microbial-Fuel-Cell-MFC-Part-II/" http://www.instructables.com/id/Make-a-Microbial-Fuel-Cell-MFC-Part-II/ ,  HYPERLINK "http://www.instructables.com/id/Make-a-Microbial-Fuel-Cell-MFC-Part-III/" http://www.instructables.com/id/Make-a-Microbial-Fuel-Cell-MFC-Part-III/ and  HYPERLINK "http://www.engr.psu.edu/ce/enve/logan/bioenergy/mfc_guide.htm" http://www.engr.psu.edu/ce/enve/logan/bioenergy/mfc_guide.htm. Out-of-class Activities and Projects (student research, class projects) Students interested in history might research the history of fuel cell development that dates back to the last half of the 19th century in England (Sir William Grove) and Switzerland (Christian Schoenbein) and continues on into the 20th C. (See additional references for the web as well as non-web printed information). Sir William Grove himself is an interesting study in terms of a person who was an experimental scientist as well as one who was trained in law and later left science research to become a judge in the high courts of England. With the current interest in alternative fuels and use of fuel cells to power automobiles, buses and, more recently, military vehicles, students could focus on the impediments to the rapid and extensive deployment of fuel cellswhy are they still not in more general use compared with the hybrid approach to powering vehicles (use of regular voltaic [lithium] batteries, along with a method for recharging those batteries) References (non-Web-based information sources) Bossel, U. The Birth of the Fuel Cell, 1835-1845: European Fuel Cell Forum: Oberrohrdorf, Switzerland, 2000. This book documents the work of Grove and Schoenbein on the fuel cell in the early to mid 19th century, their correspondence with each other in testing each others ideas plus some background to the early work of others in the nascent field of electricity and electrochemistry (Ohm, Volta, Davy, Cavendish, Scheele). There are many good drawings of the experimental equipment used along with reproductions of the correspondence between the two men. Michalovic, M. Beyond Hydrogen: The New Chemistry of Fuel Cells. ChemMatters 2007, 27 (2), pp 17-19. Web Sites for Additional Information (Web-based information sources) More sites on types of fuel cells For a complete listing of the some 22 types of fuel cells to date, see the Web site,  HYPERLINK "http://en.wikipedia.org/wiki/Fuel_cell#SOFC" http://en.wikipedia.org/wiki/Fuel_cell#SOFC . A second site that covers the multitude of questions about fuel cells, put out by the fuel cell industries as an education kit, is found at  HYPERLINK "http://www.fuelcelltoday.com/community/education-kit;jsessionid=58BD84B9B8E36B941B755A1AAD507028" http://www.fuelcelltoday.com/community/education-kit;jsessionid=58BD84B9B8E36B941B755A1AAD507028. A related Web site that provides data concerning the economics of fuel cells and projections for the future can be accessed at  HYPERLINK "http://www.fuelcells.org/info/library/QuestionsandAnswers.pdf" http://www.fuelcells.org/info/library/QuestionsandAnswers.pdf. A collection of videos on fuel cells from different sources can be found at Google Search  HYPERLINK "http://www.google.com/search?q=fuel+cell+technologies&hl=en&client=safari&rls=en&prmd=vb&source=univ&tbs=vid:1&tbo=u&ei=9iWJTOXkPMHflgem-pzmDg&sa=X&oi=video_result_group&ct=title&resnum=9&ved=0CGMQqwQwCA" http://www.google.com/search?q=fuel+cell+technologies&hl=en&client=safari&rls=en&prmd=vb&source=univ&tbs=vid:1&tbo=u&ei=9iWJTOXkPMHflgem-pzmDg&sa=X&oi=video_result_group&ct=title&resnum=9&ved=0CGMQqwQwCA ) A very good Web site from the Smithsonian Institute entitled Collecting the History of Fuel Cells includes animated diagrams of working fuel cells of various types as well as the history of the development of the fuel cell, starting in the 19th C. (Grove and Schoenbein). It can be found at  HYPERLINK "http://americanhistory.si.edu/fuelcells/basics.htm" http://americanhistory.si.edu/fuelcells/basics.htm and  HYPERLINK "http://americanhistory.si.edu/fuelcells/origins/origins.htm" http://americanhistory.si.edu/fuelcells/origins/origins.htm. The specific history of fuel cells for the 20th C is found at  HYPERLINK "http://americanhistory.si.edu/fuelcells/origins/origins2.htm" http://americanhistory.si.edu/fuelcells/origins/origins2.htm More sites on organic/biological fuel cells A Urea-based fuel cell (from Royal Society of Chemistry) can be found at  HYPERLINK "http://www.rsc.org/publishing/journals/EE/article.asp?doi=b924786f" http://www.rsc.org/publishing/journals/EE/article.asp?doi=b924786f. A different approach for a biofuel cell is the use of cell mitochondria to convert sugars to electricity. Normally, mitochondria in a cell provide biological energy through ATP production. A short article on mitochondrial-powered fuel cells is found at  HYPERLINK "http://www.goodcleantech.com/2010/08/biofuel_cells_use_food_to_powe.php" http://www.goodcleantech.com/2010/08/biofuel_cells_use_food_to_powe.php. More sites on Urea-Based Fuel Cells Researchers at Heriot-Watt University in the United Kingdom have figured out how to use urea as a fuel for low-cost fuel cells. Fuel cells are a great form of alternative energy for all kinds of thingscars, submarines, remote power stationsbut concern over the cost of hydrogen and its explosive nature keep the technology from being widely used. Using ureawhich is present in all animal and human urineinstead of hydrogen could be a low cost alternative to these super low-emission systems. Refer to  HYPERLINK "http://www.inhabitat.com/2010/08/23/researchers-use-urea-to-create-low-cost-fuel-cells/" http://www.inhabitat.com/2010/08/23/researchers-use-urea-to-create-low-cost-fuel-cells/. Another reference on the same research is at  HYPERLINK "http://www.suite101.com/content/urine-could-be-used-to-create-green-electricity-a276321" http://www.suite101.com/content/urine-could-be-used-to-create-green-electricity-a276321. A good description of a self-contained system for producing hydrogen needed in a fuel cell using urine (and the energy savings included) is found at  HYPERLINK "http://www.associatedcontent.com/article/5604390/recycling_stale_urine_electrolytic.html?cat=15" http://www.associatedcontent.com/article/5604390/recycling_stale_urine_electrolytic.html?cat=15. More sites on fuel cells in cars Questions and answers about fuel cells in cars are well documented with good graphs related to projected costs of FC-powered cars at  HYPERLINK "http://www.fuelcells.org/info/library/QuestionsandAnswers.pdf" http://www.fuelcells.org/info/library/QuestionsandAnswers.pdf. Fuel cell efficiency is 50 % compared with 15% for gasoline combustion engines. The other important factor is the pollution equationcompared with a gasoline-powered vehicle (ICEV) with reference 0 value for carbon reduction; for FC-powered cars, reduction is -56%. Hybrid powered vehicles are -32 % carbon reduction. An extensive collection of Web sites devoted to fuel cells and vehicles is found at  HYPERLINK "http://search.about.com/r.htm?q=fuel%20cell%20vehicles" http://search.about.com/r.htm?q=fuel%20cell%20vehicles. More sites on microbial fuel cells  HYPERLINK "http://www.engr.psu.edu/ce/enve/logan/web_presentations/MFC-MECs-Bruce-Logan-1-2-08.pdf" http://www.engr.psu.edu/ce/enve/logan/web_presentations/MFC-MECs-Bruce-Logan-1-2-08.pdf is a Power Point presentation by Bruce Logan (Penn State), well schooled in microbial fuel cells. The title is Electricity and Hydrogen Production Using Microbial Fuel Cell-Based Technologies. There are excellent diagrams, graphs, and photos of MFCs and their workings. 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A Web site with multiple categories concerning various aspects of microbial fuel cells can be found at  HYPERLINK "http://www.microbialfuelcell.org/www/index.php/Tutorials/" http://www.microbialfuelcell.org/www/index.php/Tutorials/. A short description of a microbial fuel cell that utilizes cell mitochondria for converting sugars to electricity is found at  HYPERLINK "http://www.goodcleantech.com/2010/08/biofuel_cells_use_food_to_powe.php" http://www.goodcleantech.com/2010/08/biofuel_cells_use_food_to_powe.php. A different approach that uses bacteria in conjunction with a plants root system as a microbial fuel cell (referred to as a Plant-MFC!) is well described at  HYPERLINK "http://www.plantpower.eu/index.php?option=com_content&view=article&id=3&Itemid=4" http://www.plantpower.eu/index.php?option=com_content&view=article&id=3&Itemid=4. One could literally be producing electricity in a rice paddy (and removing atmospheric-warming methane, produced in the paddies, in the process)! Yet another unique approach to creating a lithium battery poweredby virusesis described at  HYPERLINK "http://cleantechnica.com/2009/04/02/green-lithium-batteries-powered-by-genetically-engineered-virus/" http://cleantechnica.com/2009/04/02/green-lithium-batteries-powered-by-genetically-engineered-virus/. More sites on fuel cells in the Space Shuttle Orbiter  HYPERLINK "http://inventors.about.com/od/fstartinventions/a/fuel_cell_plant.htm" http://inventors.about.com/od/fstartinventions/a/fuel_cell_plant.htm provides detailed information about how the fuel cells function in the Orbiter and what they are used for.      PAGE \* MERGEFORMAT 3  PAGE \* MERGEFORMAT 1 PAGE  PAGE 81 The references below can be found on the ChemMatters 25-year CD (which includes all articles published during the years 1983 through 2008). The CD is available from ACS for $30 (or a site/school license is available for $105) at this site:  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters. (At the bottom of the Website screen, click on the ChemMatters CD image like the one at the right.) Selected articles and the complete set of Teachers Guides for all issues from the past five years are also available free online at this same site. (Full ChemMatters articles and Teachers Guides are available on the 25-year CD for all past issues, up to 2008.) The references below can be found on the ChemMatters 25-year CD (which includes all articles published during the years 1983 through 2008). The CD is available from ACS for $30 (or a site/school license is available for $105) at this site:  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters. (At the bottom of the Website screen, click on the ChemMatters CD image like the one at the right.) Selected articles and the complete set of Teachers Guides for all issues from the past five years are also available free online at this same site. (Full ChemMatters articles and Teachers Guides are available on the 25-year CD for all past issues, up to 2008.) The references below can be found on the ChemMatters 25-year CD (which includes all articles published during the years 1983 through 2008). The CD is available from ACS for $30 (or a site/school license is available for $105) at this site:  HYPERLINK "http://www.acs.org/chemmatters" http://www.acs.org/chemmatters. (At the bottom of the Website screen, click on the ChemMatters CD image like the one at the right.) Selected articles and the complete set of Teachers Guides for all issues from the past five years are also available free online at this same site. (Full ChemMatters articles and Teachers Guides are available on the 25-year CD for all past issues, up to 2008.) 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