ࡱ> `bOPQRSTUVWXYZ[\]^_%` bjbjNN Ų,,yy]CZ Z Z Z nnn$\\\^at<bvd{X{{{1 ,˭ͭͭͭͭͭͭ$ıh,PQn <1  Z Z {{9^B Z {n{˭ ˭v oN <2ni{Vv 0% t\* XiCX0 Y|J>|i|ni([|d;^    dB\\Z Z Z Z Z Z  I. Grade Level / Unit Number: 8th Grade/Unit 2 II: Unit Title: Matter All Around Us III. Unit Length: 7-8 Weeks IV. Major Learning Outcomes: The student will be able to . . . classify substances as matter or as not matter understand that matter can exist in three different phases - solid, liquid, and gas identify the physical and chemical properties of matter identify a substance based on its physical and chemicals properties determine whether a physical or chemical change has occurred understand that matter is made of smaller particles called atoms understand that atoms are made of smaller particles called protons, neutrons, and electrons classify elements as metals, nonmetals, and metalloids using the periodic table compare metals, nonmetals, and metalloids based on their properties and location on the periodic table predict whether an atom is likely to form a chemical bond evaluate evidence that elements combine in a multitude of ways to produce compounds understand that both naturally occurring and synthetically made substances are chemicals understand and measure the indicators of a chemical reaction (chemical change) understand and identify evidence that proves that matter is neither created nor destroyed; mass is neither created nor destroyed in a chemical reaction (law of conservation of mass) V. Objectives Included: NumberCompetency or ObjectiveRBT Tag4.05Identify substances based on characteristic physical properties: Density. Boiling/melting points. Solubility. Chemical reactivity. Specific heat. B2.3 (classifying) B4.2 (organizing)4.03Explain how the periodic table is a model for: Classifying elements. Identifying the properties of elements. B2.5 (concluding)4.02Evaluate evidence that elements combine in a multitude of ways to produce compounds that account for all living and nonliving substances. B4.2 (finding coherence) B5.1 (checking)4.01Understand that both naturally occurring and synthetic substances are chemicals.B4.2 (finding coherence) B2.3 (categorizing)4.06Describe and measure quantities related to chemical/physical changes within a system: Temperature. Volume. Mass. Precipitate. Gas production. B2.4 (summarizing) C3.1 (executing)4.07Identify evidence supporting the law of conservation of matter. During an ordinary chemical reaction matter cannot be created or destroyed. In a chemical reaction, the total mass of the reactants equals the total mass of the products mass of the products. B4.1 (selecting) B4.2 (finding coherence) VI. English Language Development Objectives (ELD) Included (see Appendix for Summary of ELD Standard Course of Study): Modifications in gray boxes within Unit. VII. Materials/Equipment Needed: Part I -Desktop periodic table -Objects and pictures to demonstrate matter -Chart paper -Lab sheets (see end of unit part) -Density cubes, equal mass rods, or equal volume rods -Density table -Graduated cylinders -Balances -Calculators -Hot plates -Thermometers -Brick -Granite -Oobleck (cornstarch mixed with water) -Marshmallows -Marbles -Balloons -5 Black markers (Recommended brands Mr. Sketch, K-Mart,Kodak, Crayola, El Marko or Felt-Tip by Flair, Expresso Fine Tip) -Sample of the ransom note -Filter paper (chromatography paper may also be used) -3-5 beakers -Ruler -Pencils -Tape -Sand -Water -Oil -Rubbing alcohol -Sugar -Salt -Flour -Baby powder -Spoons or scoops -Toothpicks -Well platesPart II-Ice -Clear cups -balloons (2 per person) -sugar -spoons -salt -magnifying glasses -magnets -iron filings -tarnished pennies -lemon juice -medicine droppers -paper towels -effervescing analgesic tablets -fresh and waste containers made of 2-liter bottles with top cut off -bread and the ingredients for making bread (eggs, flour, yeast, water) -chunk of concrete and the ingredients for making concrete (gravel, mortar mix, sand, water) -steel wool -6 white powders (sugar, salt, baking soda, cornstarch, baby powder without cornstarch, dishwasher detergent, calcium chloride) -petri dishes -toothpicks -red and blue litmus paper -vinegar -iodine -aluminum foilPart III-Mystery boxes -Cheese cube & plastic knife -Cookies, icing -Materials for 3D atom modelsPart IV-Calendar pages -Disposable camerasPart V-Permanent maker or paint -Gumdrops or marshmallows -Toothpicks -Stopwatch -Bonding chart -iMovie (optional) VIII. Big Ideas (from Support Documents): All materials in the world are the result of different combinations of a relatively small number of elements. The periodic table is a model that helps classify and identify the properties of each element. Each element has its own unique chemical and physical properties. Density, boiling/melting point, solubility, magnetism, electrical conductivity and specific heat are physical properties of matter, whereas chemical properties relate to how a substance reacts with another substance. Elements combine chemically to form compounds that also have unique physical and chemical properties. Physical changes can be observed when substances change state, shape, size or temperature. Chemical changes can be observed by the production of precipitates and gases or losses or gains in heat. In the process of combining elements through chemical reactions, scientists understand that although new substances are formed during a chemical reaction, matter is neither created nor destroyed. This important observation is called the Law of Conservation of Matter. Both naturally occurring and synthetic substances are chemical in nature. People are exposed to chemicals by ingestion, inhalation, or absorption. They can protect themselves from harmful chemicals by reducing or blocking the routes of exposure. The effect a chemical has on an organism is related to dose and the resultant concentration of the chemical in the organism. Scientists seek to learn about response of organisms to the dosage. Many substances are used because of the positive benefits to daily life and the healthful effects on the human body. When using chemicals in our everyday lives, whether as medicines, in food products, to improve crop yield or as a past of a sanitation process, we must, as informed citizens, evaluate the trade-offs. Technological advances have been made due to a better understanding of the physical and chemicals properties of substances. The suitability of materials to the technological design of a product is vital to the success of the product. Advances have allowed us to produce many substances that can improve our health and quality of life. IX. Unit Notes: Before starting this unit, you will need to do the following: For Part III: Make mystery boxes by using small jewelry boxes with small items, such as a penny, a nail, a marble, a paper clip, a rock, a wood chip, etc. There are several websites available for teachers to gain background knowledge on matter, the properties of matter and changes in matter. It is important to familiarize yourself with the websites given in this unit before your students begin using them. The following site is a good one for the teacher:  HYPERLINK "http://nbsp.sonoma.edu/resources/teachers_materials/county_regionals/11-03-01/atoms.htm" http://nbsp.sonoma.edu/resources/teachers_materials/county_regionals/11-03-01/atoms.htm Suggestions for modified instruction and scaffolding for LEP students and/or students who need additional support are embedded in the unit plan and/or are added at the end of the corresponding section of the lessons. These suggestions are presented in italics in a text box. The amount of scaffolding needed will depend on the level of English proficiency of each LEP student. Therefore, novice level students will need more support with the language needed to understand and demonstrate the acquisition of concepts than intermediate or advanced students. X. Global Content: NC SCS Grade 821st Century Skills ActivityCommunication Skills1.01,1.02, 1.08 Conveying thought or opinions effectivelyKWL charts at the end of each unit1.05,1.10When presenting information, distinguishing between relevant and irrelevant informationFlyers, Digital Scrapbook for Elements1.04Explaining a concept to othersCartoon for Physical and Chemical PropertiesInterviewing others or being interviewedComputer Knowledge1.09Using word-processing and database programsFlyers, Character Description for SuperHero1.07Developing visual aides for presentationsLabel, Trading Card1.08Using a computer for communicationDigital Scrapbook for Elements around School, Part 5 Explore (Compounds)Learning new software programsEmployability Skills1.02Assuming responsibility for own learningGiant Periodic Table Element ResearchPersisting until job is completed1.03Working independentlyElement ProjectDeveloping career interest/goals1.08 Responding to criticism or questionsInformation-Retrieval Skills1.09 Searching for information via the computerHistory of Atomic Structure Timeline Giant Periodic Table Element Research1.08 Searching for print informationTrading Card, Element Project1.09 Searching for information using community membersLanguage Skills - Reading1.03, 1.05Following written directionsAll Station Labs1.05 4.08, 4.09, 4.10Identifying cause and effect relationships1.10 Summarizing main points after readingKWL charts at the end of each lesson1.07 1.08Locating and choosing appropriate reference materialsTrading Card, Element Project1.10Reading for personal learningLanguage Skill - WritingUsing language accuratelyResume, Obituary for Scientist 1.07 1.08 1.10Organizing and relating ideas when writingFlow chart in Part 61.10Proofing and Editing2.04 Synthesizing information from several sourcesTimeline of Atomic Structure, Trading Card Activity, Giant Periodic Table Activity1.10Documenting sourcesTrading Card Activity2.03Developing an outline1.05Writing to persuade or justify a positionAnalysis for Chromatography Lab, Flyer for Mystery Powder1.09Creating memos, letters, other forms of correspondenceCartoon for Physical and Chemical Properties, Flyer for Elements and CompoundTeamwork1.01 1.05Taking initiativeWorking on a teamAll Station LabsThinking/Problem-Solving Skills1.02, 4.05, 4.07, 4.08 Identifying key problems or questions1.05, 1.07, 1.10, 2.03, 4.02Evaluating resultsPowders Lab, Chromatography Lab1.06Developing strategies to address problems1.09Developing an action plan or timelineELABORATE, Part 3: Timeline of atomic structure  Unit 2: Matter All Around Us CONTENTS Part I: Matter and Physical Properties 9 Part II: Physical and Chemical Properties and Changes 50 Part III: Structure of Matter 86 Part IV: Elements and the Periodic Table 109 Part V: Compounds, Mixtures, and Chemical Reactions 130 Matter All Around Us Part 1: Matter and Physical Properties Purpose: To describe physical properties of matter and to use the physical properties in order to identify matter. GOAL / OBJECTIVE: Goal 1 The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry. Objectives 1.01, 1.05, 1.08, 1.09, 1.10 GOAL 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry. Objectives 4.05, 4.06  ENGAGE: Place three different items in a container for each group of students. Be sure all the items are completely different for each table. Try to pick items that do not appear to have anything in common, such as a plastic comb, a marshmallow, and a book. Ask the students to study the items and decide what the items have in common. Using the Think-Pair-Share method, the students will discuss their thoughts with a partner and with the group. In a class discussion, try to steer the students to the understanding that the three items have mass and take up space. These discussions and observations should reveal the following definitions of matter to be something that has mass and takes up space. Have students conduct the mini-labs on the handout Our Ideas about Matter to continue the discussion about the physical properties of mass and volume. Have students take 3-5 minutes to Think-Pair-Share their observations/conclusions from these activities. Note to Teacher: You will see 2 different versions of the handout for the mini-labs. One has the directions on the sheet. The other is in the form of a data table with station cards that have the directions.  As a class, brainstorm a list of things that can be classified as matter and things that are not matter. You can use the attached transparency in this discussion. Remember to discuss with the students that light and heat are energy, not matter, because they do not have mass or they take up space. Pick several items on the lists and ask students to explain how they know if it is matter. Lead the students to the say that matter has mass and takes up space. Post this definition in the room.  Ask the students to make a KWL chart about matter. Have the students share some of the things they know about matter. Write these things on a large piece of chart paper. Then, ask the students to share some of the things they want to know about matter, and write their ideas on the chart paper. Tell the students that you will post the paper in the classroom to refer to as you study matter. Then, students need to keep their KWL chart to add to as they complete the unit on matter. Use the following questions in the KNOW column as a guide for students: What is mass? What is volume? How do we determine if an object is classified as matter? What are some things that are not classified as matter? What are some of the properties of matter? What is density? What is specific heat? What is solubility?  SHAPE \* MERGEFORMAT EXPLORE (these activities will take multiple class sessions to complete): Students will perform 3 labs as mini-labs or as station labs. See attached student lab sheets at the end of this unit part. The first lab is a density lab (see How Dense Is It? worksheet) using either density rods for various metals or different samples of metals with similar volumes or masses. The samples must have a similar variable (mass or volume) to measure the other variable (mass or volume) in order to calculate density. The students will determine the identity of the metals based on the calculated density and a table of known densities. (You can purchase equal mass rods, equal volume rods, or density cubes for this activity.) The second lab (see How Much Heat Will Water Hold? worksheet) will focus on specific heat. The students will compare the specific heat of sand and water. The students will heat the sand and the water for 15 minutes each and then cool them both for 15 minutes each. Then the students will record and graph the change in temperature for each substance. At the culmination of the lab, students will discuss the differences in the abilities of sand and water to gain and lose heat. See teacher notes below. The third lab (see Solubility Lab worksheet) will focus on the solubility of a substance. The students will compare the solubility of various substances in water, oil, and alcohol. An important concept for students to develop during this lab is that water is the universal solvent. However, the elaborate section will introduce separating a mixture based on a physical property (solubility/polarity). This lab would be a good place to introduce polarity for use in the water unit later. See teacher notes below. Note to Teacher: Specific Heat Lab Be sure to heat the hot plate on low-medium setting. If a high heat setting is used, the thermometer in the sand will heat too quickly and the thermometer will no longer work properly. Note to Teacher: Background on Solubility Solubility is the ability of a substance to dissolve (become trapped in) another substance. Solubility is based on polarity (the distribution of charge in a compound). Polar compounds will dissolve other polar compounds as well as ionic compounds. Non-polar compounds will dissolve other nonpolar compounds. Hence, the rule is like dissolves like. A solution is formed when one substance dissolves in another substance. The substance that dissolved is called the solute. The substance that is doing the dissolving is called the solvent.  EXPLAIN: Discuss the idea of a property using the Powerpoint HYPERLINK "Final Version of PowerPoints\\chemical_vs_physical_properties_revised_5-30.ppt"Physical versus Chemical Properties. If you do not have access to a projector, you can print out a class set of handouts from the Powerpoint for students to look at as you discuss. Ask the student to complete the handout of notes as you present the Powerpoint. To check for understanding, ask the students to complete the handout Chemical versus Physical Properties. Then discuss each example. For further practice with density, ask the students to complete the worksheet Density Practice Problems. ELABORATE: The students will perform a lab on chromatography to utilize the knowledge of mixtures and physical properties. This lab is designed to be a crime investigation. It can be changed to a standard lab format. Use the Chromatography Lab student handout for directions and observation recordings. This could be used to reinforce solubility and further discuss polarity.  SHAPE \* MERGEFORMAT  Depending on the level of the students, you can discuss the mobile phase (the water), stationary phase (the paper), and retention factor (the attraction of the ink to the water and the paper). At the conclusion of the lab, be sure that all students understand that chromatography is based on the physical property of solubility. Note to Teacher: Background on Chromatography: Chromatography is a means of physically separating a mixture based on the interactivity (polarity attractions and repulsions) of the compounds that compose the mixture and the mobile and stationary phase. Chromatography involves a sample (your mixture) being dissolved in a mobile phase (which may be a gas, a liquid or a supercritical fluid). The mobile phase (which carries your mixture) is then forced through an immobile, immiscible stationary phase (in the case of paper chromatography, it is the paper). The separation of the mixture occurs because of the different affinities for the two phases. If a component of the mixture has a high affinity for the mobile phase, it will move quickly through the chromatographic system. However, if the affinity is high for the stationary phase, the movement will be slow. When studying chromatography, scientists often calculate the retention factor for the compounds being studied. The retention factor, Rf, is a quantitative indication of how far a particular compound travels in a particular solvent. The Rf value indicates whether an unknown compound and a known compound have affinities for each other. If the Rf value for the unknown compound is close or the same as the Rf value for the known compound then the two compounds are most likely similar or identical in polarity. The retention factor, Rf, is defined as: Rf = distance solute traveled/distance traveled by the solvent  SHAPE \* MERGEFORMAT  EVALUATE: Show the students a sample comic strip or cartoon from the newspaper. Then, ask the students to create a comic strip or cartoon that emphasizes one physical property and one chemical property of matter (specific heat, density, solubility, melting point, boiling point, flammability, etc.). Allow for creativity and multiple characteristics to be described. You can use the rubric handout to evaluate their work. If desired, the comic strip can be created online at  HYPERLINK "http://www.readwritethink.org/materials/comic/index.html" www.readwritethink.org/materials/comic/index.html. Ask the students to complete the graphic organizer, Compare and Contrast: Physical and Chemical Properties, to explain the similarities and differences between physical and chemical properties. Ask the students to complete the Frayer-style worksheet on Suitability of Materials to show how the properties of matter determine how materials are used. Ask the students to write a summary of this unit on the KWL chart to show what they have learned (use the third column of the KWL chart). Questions for review: What is mass? What is volume? How do we determine if an object is classified as matter? What are some things that are not classified as matter? What are some of the properties of matter? What is density? What is specific heat? What is solubility? Additional Resources  HYPERLINK "http://sciencespot.net/Pages/classchem.html" http://sciencespot.net/Pages/classchem.html  HYPERLINK "http://sciencespot.net/Media/chemscavht.pdf" http://sciencespot.net/Media/chemscavht.pdf  HYPERLINK "http://www.chem4kids.com/" http://www.chem4kids.com/ Great site for tutorial information for kids.  HYPERLINK "http://www.middleschoolscience.com/matter.pdf" http://www.middleschoolscience.com/matter.pdf notes on properties of matter ENGAGE, Part 1 Name ___________________________________ Handout Date ____________________________________ Our Ideas about Matter What does your group think the word matter means? Write all the definitions your group can think of. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 1: Oobleck Describe the substance using as much detail as possible: ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Is this matter? Explain. __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes this substance matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 2: Shaving Cream Describe the substance using as much detail as possible: ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Is this matter? Explain. __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes this substance matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 3: Granite and Brick Describe each of the substances using a Venn diagram  SHAPE \* MERGEFORMAT  Are these substances matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes these substances matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 4: Cornflakes Put 1 cup of cornflakes in a ziplock bag. Measure the mass of the bag and cereal. Mass = ____________________ Note the amount of cereal in the bag. ____________________________ Carefully crumble up the cereal. Measure the mass again. Mass = ____________________ Note the amount of cereal in the bag. ____________________________ 3. Describe the changes in the substance using as much detail as possible. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Is this matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes this substance matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 5: Marbles and Marshmallows: Measure the mass of 2 empty beakers that are the same size. Fill one beaker with marbles. Fill another beaker with marshmallows. Measure the mass of the beakers with the marbles and marshmallows. Subtract the mass of the empty beaker to determine the mass of the marbles and the marshmallows. Record data: SubstanceMarblesMarshmallowsMass of beaker with substanceMass of empty beakerMass of the substance Is there anything that remains the same? ______________ Are these substances matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes these substances matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 6: Water Describe the substance in as much detail as possible: ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Is this matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes this substance matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Station # 7: Balloon Measure the mass of the deflated balloon. Mass = _______________ Inflate the balloon. Measure the mass of the balloon. Mass = _______________ Describe the substance in as much detail as possible: ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________  Is this inflated balloon matter? Explain in words and pictures __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ What makes this substance matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Conclusion: After conducting all these inquiries, review your group definitions of matter. What does your group think the word matter means now? ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ What makes an object matter? __________________________________________________________________________________________________________________________________________________________________________________________________________________ Give other examples of matter and explain what makes them matter. __________________________________________________________________________________________________________________________________________________________________________________________________________________ ENGAGE, Part 1 Name ___________________________________ Handout Date ____________________________________ Our Ideas about MATTER Group Definition of MATTER _______________________________________ ____________________________________________________________________________________________________________________________ Station 1 : OobleckDescription Is this matter? Explain.What makes it matter?Station 2: Shaving CreamDescription Is this matter? Explain.What makes it matter?Station 3: Granite and BrickDescribe the granite. Describe the brick.How are they alike?Are these substances matter? Explain. What makes these substances matter?Station 4: CornflakesMass of bag of cornflakes Description Mass of bag of crumbled cornflakes = DescriptionDescribe how the cornflakes changed. Is this substance matter? Explain. What makes it matter?Station 5: Marbles and MarshmallowsMass of cup of marbles Mass of empty cup Mass of marblesMass of cup of marshmallows Mass of empty cup Mass of marshmallows What is the same each time? Are these substances matter? Explain. What makes these substances matter?Station 6: WaterDescription Is this matter? Explain.What makes it matter?Station 7: BalloonMass of deflated balloon Mass of inflated balloonDescribe the deflated Balloon. Is the deflated balloon matter? Explain.What makes it matter?Describe the inflated balloon. Is there matter inside the balloon? Explain.What makes it matter? Review your group definition of MATTER. Revise your definition as needed. _________________________________________________________________________________________________________________________________________________________________________________________________________ Based on these experiences, what determines if something is matter? _________________________________________________________________________________________________________________________________________________________________________________________________________ Make a list of matter not used in this activity: 1. ____________________________ 2. ____________________________ 3. ____________________________ 4. ____________________________ 5. ____________________________ 6. ____________________________ 7. ____________________________ 8. ____________________________ 9. ____________________________ 10. ___________________________ 11. ___________________________ 12. ___________________________ 13. ___________________________ 14. ___________________________ 15. ___________________________        ENGAGE, Part 1 Name ___________________________________ Handout Date ____________________________________ KWL Chart We are studying . M A T T E R! What I KNOW about matter:What I WANT to know about matter:What I LEARNED about matter:1. What is matter? 2. What is mass and volume? 3. What determines if something is matter? 4. What is something that is not matter? 5. What are some properties of matter? 6. What is density? 7. What is specific heat? 8. What is solubility?  EXPLORE, Part 1 Name ___________________________________ Handout Date ____________________________________ How Dense Is It? Purpose: To investigate density and the ability to use density as an identifying property of a substance. (SCOS Objectives: 4.05 and 4.06) Materials: Density rods or cubes Balance Graduated cylinder Calculator Water Background: Density is a property of matter that is specific to the substance. A substance can be identified based on its density. In order to calculate the density of the substance, you must first measure the mass by the volume for each object. Then divide the mass by the volume. Procedure: Observe each rod or cube. Record observations in data table. Measure the mass of each rod or cube using the balance (measure to the nearest 0.01g) and record the mass in the data table. Measure 40 mL of water in the graduated cylinder and record the volume of water in the data table. Gently place one of the rods in the graduated cylinder with the 40 mL of water. Record the volume of water after the rod is placed in the graduated cylinder in the data table. Subtract the two volumes to find the volume of the rod. Repeat this process for all of the rods at the station. Determine the density of each object by dividing the mass by the volume (round to the nearest tenth). Observations: ObjectObservations A B C DHow are the objects alike?How are the objects different? Data Table: Object Mass (g)Measured volume of water (mL)Volume of water with object submerged (mL)Subtracted volume (mL) = volume of object Density (g/mL)Rod ARod BRod CRod D Calculations: Density is defined as mass per unit volume. Therefore, the equation for density is: D = m/V Example: Mass = 32.5 g and Volume= 35.8 mL D = 32.5g / 35.8mL D = 0.91g / mL Analysis: What is mass? What is volume? Does the size of a sample alter the density of the sample? Explain. Does the density of matter affect the substances ability to float? Explain. Based on the information in the lab, would a rock with a density of 1.75 g/mL sink or float in water that has a density of 1.0 g/mL? Explain. Class Data Table: GroupABCD 1 2 3 4 5 6 7Average Density EXPLORE, Part 1 Name ___________________________________ Handout Date ____________________________________ How Much Heat Can Water Hold? Probing Questions: Discuss the following in your groups. Have you ever been to the beach or to a sandy lake in the morning? Is the sand warm or cool? What was the temperature of the sand like at lunch time? What about at night? Have you ever wondered why the temperature of the sand is different at different times of the day? What about the water temperature? Does it vary as much as the sand? Can you explain your observations? In this lab, you will investigate the scientific principles behind your observations. Materials: sand water hot plate or heat source beakers thermometers Procedure: Heat 200 mL of sand and water for 15 minutes on a low heat setting. Record the temperature change of the sand and water every minute for the 15 minutes. Cool the sand and water for 15 minutes. Record the temperature change every minute for the 15 minutes. Data: Heating Data Time (minutes)WaterSand0123456789101112131415Cooling Data Time (minutes)WaterSand0123456789101112131415 Analysis: Did the sand or water heat faster? How can you explain this? Which substance lost heat the fastest? How can you explain this? Were your observations/hypotheses from the probing questions supported by the data from the experiment? How might you modify your explanations to the probing questions based on the data? What is specific heat? How does specific heat explain your results? EXPLORE, Part 1 Name ___________________________________ Handout Date ____________________________________ Solubility Lab Purpose: To investigate the solubility of a substance in water, cooking oil, and alcohol. Background Information: Solubility is the ability of a substance to dissolve (become trapped in) another substance. Solubility is based on polarity (the distribution of charge in a compound). Polar compounds will dissolve other polar compounds as well as ionic compounds. Nonpolar compounds will dissolve other nonpolar compounds. Hence, the rule is like dissolves like. A solution is formed when one substance dissolves in another substance. The substance that dissolved is called the solute. The substance that is doing the dissolving is called the solvent. In this lab, you will investigate the solubility of substances in watera polar compound. Materials: well plates water sugar baby powder toothpicks cooking oil salt cornstarch scoops/spoons rubbing alcohol flour Problem # 1: Which substances will dissolve in water? (Sugar, salt, baby powder, flour, cornstarch) Hypothesis: I think _____________________________________will dissolve in water. Procedure: Fill 5 wells half full with water. Add a few grains of substance in each of the 5 wells. Make sure that you start with the sugar, salt etc. Mix well. Use a different toothpick for each of the substances. Record observations in data table. Problem # 2: Which substances will dissolve in cooking oil? (Sugar, salt, baby powder, flour, cornstarch) Hypothesis: I think _________________________________will dissolve in cooking oil. Procedure: Fill 5 wells half full with cooking oil. Add a few grains of substance in each of the 5 wells. Make sure that you start with the sugar, salt etc. Mix well. Use a different toothpick for each of the substances. Record observations in data table Problem # 3: Which substances will dissolve in rubbing alcohol? (Sugar, salt, baby powder, flour, cornstarch) Hypothesis: I think ______________________________will dissolve in rubbing alcohol. Procedure: Fill 5 wells half full with rubbing alcohol. Add a few grains of substance in each of the 5 wells. Make sure that you start with the sugar, salt etc. Mix well. Use a different toothpick for each of the substances. Record observations in data table Analysis: Which compounds/substances were soluble in water? Which compounds/substances were insoluble in water? Does the amount of the substance affect the solubility (you may want to test this using one or two of the substances)? Justify your answer using evidence from testing one or more substances Based on the information in this lab, why can oil be skimmed off of water after an oil spill? What type of compound would be suitable to make a product to clean up oil spills? Conclusion: Write a conclusion paragraph which explains the results. Table # 1: Substances with Water Substance:Observations:SolubleInsolublePolar/ IonicNonpolarSugar Salt Sugar Baby Powder Flour Cornstarch  Table # 2: Substances with Cooking Oil Substance:Observations:SolubleInsolublePolar/ IonicNonpolarSugar Salt Sugar Baby Powder Flour Cornstarch  Table # 3: Substances with Rubbing Alcohol Substance:Observations:SolubleInsolublePolar/ IonicNonpolarSugar Salt Sugar Baby Powder Flour Cornstarch  EXPLAIN, Part 1 Name ___________________________________ Handout Date ____________________________________ Physical Versus Chemical Properties I. Reviewing matter: Matter: anything that has mass and takes up space Mass the amount of matter in something Volume the amount of space something occupies Is it Matter?YesNoA car?A box?You?Heat? II. Property: a characteristic of a _________________ that can be _____________. III. Physical property: a property that can be observed ________________ changing the _______________ of the substance. Examples: luster, ________________ (the ability to be hammered into ______________ _______________ ), __________________ (the ability to stretch into a _______________ ________________), melting point, _________________ point, density, solubility and specific heat. IV. Special properties: Melting point: temperature at which a substance changes from a solid to a __________ at a given H2O = ________________ Boiling point: temperature at which a substance changes from a __________ to a _____________ at a given pressure. H2O = ________________. V. Chemical property: a property that can be only be observed by _________________ the _________________ of the substance. Examples: flammability, ability to rust, reactivity with vinegar VI. Density: the amount of ___________________ per unit of ___________________. Density can be used to identify a substance. Waters density is ____________________. VII. Calculations D = m/V = g/mL = g/cm3 Examples: A cube has a mass if 2.8g and occupies a volume of 3.67mL. Would this object float or sink in water? This object would _______________ in water because its density is _____________ than water whose density is ______________. VIII. More Density Calculations A liquid has a mass of 25.6 g and a volume of 31.6 mL. What is the identity of the liquid? ______________________ *Use the information in the chart for reference. SubstanceDensity (g/mL)Mercury13.6Water1.0Ethanol0.81  EXPLAIN, Part 1 Name ___________________________________ Handout Date ____________________________________ Chemical versus Physical Properties Property DescriptionChemicalPhysicalCan react with vinegarDensityCan react with the oxygen in the airLuster (shininess)The ability to freezeCan react with an acidCombustibleThe ability to meltThe ability to digest foodThe ability to sublime (solid ( gas)MalleabilityDuctilityThe ability to react with waterThe ability to neutralize stomach acidColorMagnetismOdorThe ability to rustThe ability to evaporate EXPLAIN, Part 1 Name ___________________________________ Handout Date ____________________________________ Density Practice Problems 1.   SHAPE \* MERGEFORMAT  A student is given 3 solid samples to identify. He measures the mass and volume of each sample. The data is recorded in the table below. He then uses a chart of densities of known substances (shown in the chart below) to identify the solids. According to his data, what are the identities of the unknown substances?  Sample 1 __________________________ Sample 2 __________________________ Sample 3 __________________________ 3. A student used a balance and a graduated cylinder to collect the following data:   ELABORATE, Part 1 Name ___________________________________ Handout Date ____________________________________ Chromatography Lab Purpose: You are a CSI investigating the kidnapping of the child of a very prominent political figure. A ransom note has been found. Your team has narrowed down the possible kidnappers to 5 suspects. Each suspect was carrying a black writing utensil. Your job is to utilize the process of chromatography to determine which pen/suspect wrote the ransom note. Background Information: Chromatography is a means of separating a mixture based on polarity and solubility. During chromatography, two phases are observed, a mobile phase and a stationary phase. The mobile phase is a liquid in paper chromatography (water in this lab) that carries the tested substance along the stationary phase. The stationary phase is a solid (paper in this lab) that stops the parts of the mixture as the attraction to the mobile phase decreases and attraction to the stationary phase increases. The retention factor measures the relative attraction of the mixtures that were separated. Different brands of writing utensils use different mixtures of ink. Each ink solution will have its own chromatogram and retention factor. You will test 5 writing utensils and a sample of the ransom note. Materials: 5 black markers (Recommended brands Mr. Sketch, K-Mart, Kodak, Crayola, El Marko or Felt-Tip by Flair, Expresso Fine Tip) Sample of the ransom note Filter paper (chromatography paper may also be used) 3-5 beakers Ruler Pencils Tape Procedure: Cut strips of filter paper 8-cm long and approximately 1 cm wide with a pointed end. Make a line across the strip 1 cm from the bottom (pointed end). Place a heavy dot of each writing utensil on a strip. EACH WRITING UTENSIL SHOULD HAVE ITS OWN STRIP. Place a small amount of water in the beakers. Tape the strips to the pencils (bend a small amount of the paper over the pencil and tape it to keep it from falling into the beaker). Make sure the pointed end of the strip touches the water. DO NOT SUBMERSE THE LINE WITH THE DOT ON IT IN THE WATER! Allow the mixtures to separate for 10 minutes. Allow the chromatograms to dry. Tape the chromatograms to a piece of white paper and label which writing utensil was used. Measure the distance the ink traveled (measure from the pencil line to where the ink stopped) and the distance the water traveled (measure from the bottom of the paper to where the paper is no longer wet). Record this information in the data section. Then, divide the distance the ink traveled by the distance the water traveled. Data: Ink Source Distance Ink Traveled (cm) Distance Water Traveled (cm) Rf=Ink/WaterMarker #1 Brand Name:Marker #2 Brand Name:Marker #3 Brand Name:Marker #4 Brand Name:Marker #5 Brand Name:Ransom Note  Analysis: Which writing utensils separated using water? Which writing utensils did not separate using water? What property would account for this refusal to separate? Write a paragraph defending your choice as to which pen wrote the ransom note. Be sure to include experimental data to support your choice. EVALUATE, Part 1 Name ___________________________________ Handout Date ____________________________________ Rubric for Cartoon or Comic Strip 4321Characters (properties and substance chosen) Clear identity, actions and dialogue are very appropriate.Clear identity, actions and dialogue are appropriate.Identified, but actions and dialogue are too general.Hard to tell who the characters are and what actions and dialogue are present. Captions Captions are easy to understand and clearly related to the content and the scenes.Most captions are easy to understand and related to the content and scenes.Some captions are easy to understand and somewhat related to the content and scenes.Captions are not easy to understand and do not relate to the content and scenes. Content Physical and chemical properties are clearly explained.Physical and chemical properties are explained.Physical and chemical properties are partially explained. Physical and chemical properties are not explained. Creativity Outstanding art and excellent display of concept.Good art and good display of concept.Art is adequate and adequate display of concept.Poor art and poor display of concept.Spelling, Punctuation, GrammarNo errors noted.1-3 errors noted.4-5 errors noted.More than 5 errors. EVALUATE, Part 1 Name ___________________________________ Handout Date ____________________________________ Compare and Contrast I am investigating . . . Physical Properties and Chemical Properties How are they alike?  SHAPE \* MERGEFORMAT  How are they different?  SHAPE \* MERGEFORMAT     Unit 2: Part 1 Transparency MATTER has mass and takes up space. Unit 2: Part 1 Transparency DENSITY is the quantity of matter that is packed into a fixed space. = mass per unit of volume = D = m/v Unit 2: Part 1 Transparency HEAT is energy that is transferred from a substance with a higher temperature to a substance with a lower temperature. For example, the sun transfers heat to ice and the ice melts. Unit 2: Part 1 Transparency The SOLUBILITY of a substance is the ability of the substance to dissolve. Unit 2: Part 1 Transparency Physical property is a characteristic of a substance that can be observed without changing the identity of the substance Examples: color, shape, smell, luster, size, melting point, boiling point Unit 2: Part 1 Transparency Chemical property is a characteristic of a substance that can ONLY be observed when the identity of the substance is changed. Examples: chemical reactivity, flammability, combustibility, corrosiveness (rusting) Unit 2: Part 1 Transparency Polarity is an uneven distribution of charges in a molecule. Example: Water molecule  SHAPE \* MERGEFORMAT  Terms Used in Part I Mass: amount of matter contained in a substance Volume: amount of space an object occupies Matter: has mass and volume Property: a characteristic of a substance that can be observed Physical property: a characteristic of a substance that can be observed without changing the identity of the substance Chemical property: a characteristic of a substance that can be observed ONLY when the identity of the substance is changed Density: mass per unit volume Specific heat: the amount of energy needed to raise one gram of a substance by one degree Celsius Solubility: the solubility to dissolve in another substance Chromatography: a means of separating a mixture based on polarity and solubility Ductility: the ability to be stretched into a thin wire Malleability: the ability to be hammered into a sheet Freezing point: temperature at which a solid changes to a liquid at a given pressure Boiling point: temperature at which a liquid changes to a gas at a given pressure Matter All Around Us Part 2: Physical and Chemical Properties and Changes Purpose: To describe physical and chemical properties of matter and to observe physical and chemical changes in matter in order to identify matter. GOAL / OBJECTIVE Goal 1: The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry. Objectives 1.01, 1.05, 1.08, 1.09, 1.10 Goal 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry.  Objectives 4.02, 4.04, 4.05, 4.06 ENGAGE: Use transparency Draw and Describe Your Hair to get the students to think about the properties and changes of their hair. Ask the students to draw an outline of a head on a sheet of paper. Then, ask them to draw and describe their hair. Next, ask them to answer the questions. As a class, discuss all the properties and changes. Ask the students to make a KWL chart about the properties and changes of matter. Have the students share some of the things they know about the property and changes of matter. Write these things on a large piece of chart paper. Then, ask the students to share some of the things they want to know about the properties and changes of matter, and write their ideas on the chart paper. Tell the students that you will post the paper in the classroom to refer to as you study the properties and changes of matter. Then, students need to keep their KWL chart to add to as they complete the unit on matter. Use the following questions as a guide for the know column of the KWL chart What is a property? What is a change? What are some properties of matter? What are some of the ways matter can change? How do you know these changes have occurred? What is the difference between a physical and chemical property? What is the difference between a physical and chemical change? EXPLORE: Note to Teacher: Before class begins, set up the following stations around the classroom. Be sure each station is labeled. Make Station Cards and gather all materials for each station in a small box or container. Cut the top off several 2-liter bottles or milk jugs to use for waste products. Listed below is a description of the materials and equipment that need to be set up at each station. StationTitleMaterialsType of Activity1Melting IceIce cubes in a clear cupPhysical2Blowing up a Balloon1-2 balloons per person Physical3Dissolving SugarSugar, Water supply (2 liters), small container (100 - 200 ml), teaspoon, waste container (2 liters)Physical4Sugar and SaltSalt, sugar, 2 teaspoons, paper or dish to mix them in, magnifying glass, waste container.Physical5Observing MagnetismMagnet, Iron filingsPhysical6Tarnished PenniesTarnished pennies, lemon juice (undiluted), medicine dropper, paper towelsChemical7Effervescing TabletsEffervescing analgesic tablets, 2-liter container of water marked "Fresh," and small container (100 - 200 ml), 2-liter container marked "Waste".Chemical8Bread v/s ConcreteBread and most of the ingredients it is made from (eggs, flour, yeast, etc.) in small containers: a chunk of concrete and most of its constituents, including gravel, mortar mix, sand, and water.Chemical9Steel WoolSteel wool soaked in water for a few daysChemical Divide your class into groups of 2-3 students. Each group will go from station to station to perform all of the activities and record observations and results for each station. It may take 2-3 days for the students to visit each station, but allow them time to explore. After the students have finished the stations, have a class discussion of their observations. EXPLAIN: Review the concept of a property. Properties of matter can either be physical or chemical. Introduce the concept of change using the PowerPoint HYPERLINK "Final Version of PowerPoints\\Physical_and_Chemical_Changes_revised_6-10.ppt"Physical versus Chemical Changes. (If you do not have access to a projector, you can print out a class set of handouts from the PowerPoint for students to look at as you discuss.) Ask the student to complete the handout of notes as you present the PowerPoint. To check for understanding, ask the students to complete the handout Chemical versus Physical Changes. Then discuss each example.  SHAPE \* MERGEFORMAT  Explain what indicators, chemical reactions, and solutions are: - An indicator is something that produces an observable physical change but still retains its original form. Some of these changes may include the appearance or disappearance of a color. Ask the students if any of the variables were indicators. If so, how do you know? - A chemical reaction occurs when the original substance changes form into a new substance. Some clues to a chemical reaction may include bubbles, smoke, a strong smell, color change, temperature change, or a sizzling sound. Ask the students if any of the powders went through a chemical reaction. How do they know? What were the clues? - A solution is when one substance mixes with another and dissolves. Ask if anyone noticed any solutions during their experiment. How do they know? ELABORATE: Set up your classroom as a CSI Laboratory with the various stations to study the white powders. Place the materials and a copy of the instructions for each station in a tray (see CSI-Mystery Powders Lab sheet for copies of station cards to print). Tell the students they are forensic chemists. Go over the scenario and the procedure from the CSI Mystery Powder Lab worksheet.  Have the students go through the stations and perform the tests on the test powders and compare the data to the mysterious powder found at the crime scene in the victims home. Remind the students to pay attention to detail and use good technique when working with each chemical. Following the investigations with the white powders, give the students a vial of the mystery powder you have prepared of at least two of the six powders from the investigation. Ask the students to run the tests again on this mystery powder to identify this powder from the victims home. They will need to use the same procedures for testing as before. Tell the students to use the results their previous observations noted on their chart to determine the composition of the mystery mixture. Ask the students to identify the physical properties of the powders (i.e. color, crystalline shape, smell) and the chemical properties. Also, ask the students to identify physical and chemical changes that occurred with the powders. Ask the students to work in groups to complete a flow chart (see Flow Chart worksheet) that shows how they go about identifying the mystery powder. When groups have finished, have the whole class check the steps together and allow students make changes to their flow charts as needed. Note to teacher: The six powders chosen were selected for the following reasons: Sugar and salt for the differences in their crystalline structure Baking soda for the reaction with vinegar producing a gas and its basic pH Cornstarch for the positive starch test with iodine Baby powder with NO cornstarch for the lack of solubility Dishwasher detergent for the smell and the basic pH Prompting Questions to students: How could we find the identity of an unknown powder? We can experiment using different variables. These variables may include water, iodine, vinegar, a heat source, a magnifying glass, and our senses, among others. We use these known resources to identify unique characteristics of an unknown substance in order to come to a conclusion about what each substance may be. What happened when vinegar was added to the powders? What concept is being shown? A gas evolved (bubbles created). The concept of the indicators of chemical reactions (chemical changes in a system). Did all of them have the same response? What happened when iodine was added, etc.? The iodine reacted with the starch to show a positive starch test. Why do you think this happened? Were your initial predictions correct? How were they different? What are the true identities of mystery powders A-E? What clues did you use to find the correct answer? What clues from your first guess made you think it was something it wasn't? Variations: Use any of the websites listed below for more ideas on identifying mystery powders. Another version is found in the Holt Science and Technology, Grade 8 Book on pg. 178 (White Before Your Eyes). The following links are for mystery powder activities.  HYPERLINK "http://www.wbra.org/html/edserv/ntti/2005Lessons/Inquiring_Minds.pdf" http://www.wbra.org/html/edserv/ntti/2005Lessons/Inquiring_Minds.pdf  HYPERLINK "http://www.eduref.org/Virtual/Lessons/Science/Chemistry/CHM0200.html" http://www.eduref.org/Virtual/Lessons/Science/Chemistry/CHM0200.html  HYPERLINK "http://www.thebakken.org/education/SciMathMN/chemical-human-resources/elements1.htm#Scientists" http://www.thebakken.org/education/SciMathMN/chemical-human-resources/elements1.htm#Scientists  HYPERLINK "http://unr.edu/homepage/crowther/opchem/oobleck.html" http://unr.edu/homepage/crowther/opchem/oobleck.html  HYPERLINK "http://sciencespot.net/Media/cookjemys.pdf" http://sciencespot.net/Media/cookjemys.pdf EVALUATE: -Give the students the chart that shows the physical and chemical properties of specific white powders. Then ask the students to use the data they have collected to identify the powders. -Ask the students to complete the graphic organizer (Compare and Contrast) to explain the similarities and differences in chemical and physical changes. Ask the students to write a paragraph to explain why it is important to understand the physical and chemical properties and changes. -Ask students to create a label for the mystery powder or create a flyer about the mystery powder using evidence from labs.  * Ask the students to revisit their KWL chart to show what they have learned. ENGAGE, Part 2 Handout Draw and describe your hair.  SHAPE \* MERGEFORMAT  How has your hair changed over time? What other ways could you change your hair? ENGAGE, Part 2 Name ___________________________________ Handout Date ____________________________________ KWL Chart We are studying .Properties and Changes of M A T T E R! What I KNOW about matter: What I WANT to know about matter:What I LEARNED about matter:1. What is a property? 2. What is a change? 3. What are some properties of matter? 4. What are some of the ways matter can change? 5. How do you know if these changes have occurred? 6. What is the difference between a physical and chemical property?7. What is the difference between a physical and chemical change? EXPLORE, Part 2   EXPLORE, Part 2   EXPLORE, Part 2  EXPLORE, Part 2   EXPLORE, Part 2  EXPLORE, Part 2 Name ___________________________________ Handout Date ____________________________________ Exploring How Matter Changes Remember: A physical property is one you can observe without changing the identity of the substance and a chemical property is one that can only be observed when the identity of the substance is changed. Based on this information, how would you define the following: Physical change ________________________________________________________________________________________________________________________________________________ Chemical change ________________________________________________________________________________________________________________________________________________ Complete the following data table as you explore the items at each station. Be sure to answer all the questions on the station cards. StationObservationsPhysical or Chemical? Your Explanation 1  2  3  4  5  6  7  8  9  EXPLAIN, Part 2 Name ___________________________________ Handout Date ____________________________________ Physical and Chemical Changes Concept of Change Change: the act of __________________ a substance. Physical Change Physical change: a change that occurs _____________ changing the ____________ of the substance. Examples: Melting ice ____________ ____________ Tearing paper ____________ ____________ Chemical Change Chemical change: a change that occurs that _____________ the _________ of a substance to change. Examples: burning _____________ ____________ Reacting with other substances A chemical change is also called a ___________ ____________ Indicators of a Chemical Change Evolution of ________________ Evolution of ________________ Evolution of ________________ _________________ Change Formation of a ______________ Is It Physical or Chemical? ChangePhysicalChemicalMelting cheeseBurning coalMilk souringWading up paperBicycle rustingEXPLAIN, Part 2 Name ___________________________________ Handout Date ____________________________________ Chemical versus Physical Changes Property DescriptionChemicalPhysicalWood burningReacting with vinegar to form CO2 and H2OButter meltingDry ice subliming(s(g)Hydrogen and oxygen reacting to form waterIce cream freezingTearing paperSalt dissolving in water Water boilingPancake cooking on a griddleGrass growingWater condensing An egg fryingWater evaporatingA cake bakingA soda going flatELABORATE, Part 2 Name ___________________________________ Handout Date ____________________________________ CSI Mystery Powders Lab Purpose: To describe physical and chemical properties of matter and to observe physical and chemical changes in matter in order to identify matter. GOAL 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry. Objectives 4.02, 4.04, 4.05, 4.06 Your Assignment: You are a crime scene investigator who has been assigned the task of identifying the contents of a vial found at the scene of a murder. The vial is suspected to be a poison that was given to the victim in his drink. Various white powders were found in the car of the suspected killer. You job is to analyze the 6 known white powders found in the suspected killers car and compare the results to the analysis of the vial found in the victims home to determine the composition of the poison. Procedure: Each group of investigators has a baggie of vials of the 6 white powders found in the suspects car. You are to move through the testing stations in the crime lab (the classroom) performing each test on the 6 white powders. Once you have completed the analysis of the 6 powders, you will be given a sample of the powder from the vial in the victims home. You are then expected to run the sample through all of the testing that you performed on the 6 powders. YOU MUST RECORD YOUR OBSERVATIONS FOR EACH TESTING STATION AND EACH POWDER. STATION 1: CRYSTALLINE STRUCTURE Place a small amount of powder 1 in the Petri dish. Place the Petri dish under the microscope. SKETCH the structure of the powder, as you see it, under the microscope in your data section. Repeat the process for each powder. Wipe the Petri dish out between each test. STATION 2: SOLUBILITY (Water) Place a small amount of powder 1 in the Petri dish. Add 25 drops of water to the solid. Stir the mixture with a toothpick. Record your observations. Pay close attention to whether or not the powder dissolves in the water. Repeat the process for the rest of the powders. STATION 3: ODOR AND TEXTURE Place a small amount of each powder in a well in the well plate. DO NOT MIX THE POWDERS TOGETHER. Waft (wave the odor towards your nose with your hand) each powder. Record your observations in the data section. Note the texture of each powder. Record this observation in the data section. STATION 4: pH Place a small amount of each powder in a well in the well plate. DO NOT MIX THE POWDERS. Add 10-15 drops of water to each powder. Touch the tip of a piece of red litmus paper to each mixture. Use a different piece for each powder mixture. Record your observations in the data section. Repeat the process using blue litmus paper. Record your observations in the data section. STATION 5: LIQUID TESTS (Suggestion: vinegar, iodine, and milk) Place a small amount of each powder in a Petri dish. DO NOT MIX THE POWDERSEACH POWDER SHOULD GET ITS OWN PETRI DISH. Add 5 drops of liquid 1 to the Petri dishes under liquid 1. Record your observations in the data section. Add 5 drops of liquid 2 to the Petri dishes under liquid 2. Record your observations in the data section. Add 5 drops of liquid 3 to the Petri dishes under liquid 3. Record your observations in the data section. STATION 6: THE HEAT IS ON Make 6 aluminum foil trays. Place a small amount of each powder in its own dish. Set the foil dishes with the powders on the hot plate (turned on a medium heat setting). Allow the powders to heat for 5-10 minutes. Record you observations in the data section. VICTIMS HOME: You will repeat EVERY test from the 6 stations with your sample from the Victims home. You will compare the results of the sample from the Victims home to the tests you performed on each of the powders at stations 1-6. Data Section STATION 1 OBSERVATIONS:  Powder 1 Powder 2 Powder 3  Powder 4 Powder 5 Powder 6  Victims Home STATION 2 OBSERVATIONS POWDERSOLUBLEINSOLUBLE 1 2 3 4 5 6 VICTIMS HOMESTATION 3 OBSERVATIONS POWDERODORTEXTURE 1 2 3 4 5 6 VICTIMS HOME STATION 4: pH POWDERRED LITMUSBLUE LITMUS 1 2 3 4 5 6 VICTIMS HOME STATION 5 OBSERVATIONS POWDERLIQUID 1LIQUID 2LIQUID 3 1 2 3 4 5 6 VICTIMS HOMESTATION 6 OBSERVATIONS POWDEROBSERVATION 1 2 3 4 5 6 VICTIMS HOMEAnalysis Questions: Describe, in complete sentences, how you cross-referenced your data from the 6 stations to determine the composition of the powder from the victims home. Determine which tests are used to investigate physical properties. Determine which tests are used to investigate chemical properties. Describe the differences between physical and chemical properties. Why is the identity of the powders not an issue in this lab? ELABORATE, Part 2   ELABORATE, Part 2   ELABORATE, Part 2  ELABORATE, Part 2 Name ___________________________________ Handout Date ____________________________________ FLOW CHART List your topic at the top and write the steps you took, in order, on the flow chart.  SHAPE \* MERGEFORMAT  EVALUATE, Part 2 Name ___________________________________ Handout Date ____________________________________ Identifying the Mystery Powders Using Chemical or Physical Properties: Study the data table below. Compare the data with results you collected as you performed various test on the 6 white powders. Answer the questions. PowderColor / Texture pH Iodine Water Vinegar Heat SolubilityBaking sodaFine white powderBlueYellow / orangeFizzesFizzesMay brown edgesYesSaltWhite cubic crystalsNo changeNo reactionDissolvesNo reactionTurns clearYesSugarWhite irregular crystalsNo changeYellowDissolvesDissolvesBurns and charsYesCorn starchFine yellow white powder-silkyNo changeReddish-purple then blackMakes cloudy but stays on bottomGets thick and then hardBrown around edgesNoDishwasher detergent (powder)Small white ballsBlueYellow / orangeFizzesFizzesNo reactionPart.Baby powderFine white powder-silkyNo changeYellowMakes cloudy but stays on bottomNo reactionNo change No  What is the identity of the powders used in the CSI Mystery Powder Lab? Powder 1 is ________________________________. Powder 2 is ________________________________. Powder 3 is ________________________________. Powder 4 is ________________________________. Powder 5 is ________________________________. Powder 6 is ________________________________. What powders make up the powder found in the Victims Home? EVALUATE, Part 2 Name ___________________________________ Handout Date ____________________________________ Compare and Contrast I am investigating . . . Physical Changes and Chemical Changes How are they alike?  SHAPE \* MERGEFORMAT  How are they different?  SHAPE \* MERGEFORMAT     Teacher Resource #2 Unit 2: Part 2 Transparency Change Transform from one form to another Example: Chemical change = burning paper Physical change = ice melting into water Unit 2: Part 2 Transparency Indicator Something that produces an observable change but still maintains its original form. Example: When a color appears or disappears in the substance. Unit 2: Part 2 Transparency Chemical Reaction A chemical reaction occurs when the original substance changes form into a new substance. Example: Paper burns and changes to ashes and smoke. Unit 2: Part 2 Transparency Solution A solution is when one substance mixes with another and evenly dissolves. Example: Salt and water = salt water Terms Used in Part 2 Change: Transform from one form to another. Example: Chemical change = burning paper Physical change = ice melting into water Indicator: something that produces an observable physical change but still retains its original form. Some of these changes may include the appearance or disappearance of a color. Chemical reaction: occurs when the original substance changes form into a new substance. Some clues to a chemical reaction may include bubbles, smoke, a strong smell, color change, temperature change, or a sizzling sound. Solution: when one substance mixes with another and dissolves. Example: Salt + Water = Salt Water Matter All Around Us Part 3: Structure of Matter Purpose: To investigate the structure of the atom and how the model of the atom has evolved over time. GOAL / OBJECTIVE: Goal 1: The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry. Objectives 1.01, 1.05, 1.08, 1.09, 1.10 Goal 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry. Objectives 4.03, 4.01, 4.02, 4.04 4.05  ENGAGE: Note to Teacher: You will need to make mystery boxes in advance. You can use small jewelry boxes (or plastic film canisters) with small items, such as a penny, a nail, a marble, a paper clip, a rock, a wood chip, etc. Option #1: Give each group of students a mystery box. Ask the following questions: What do you think is in the box? Other than opening the box, how could you find out what is in the box? note student responses on board How would a scientist go about investigating this box? note student responses on board Allow students to investigate the boxes using their senses without opening the box. Ask the key question: How can you identify a substance? have students brainstorm responses to this question in groups and note their ideas on the board. *Lead the students to the idea that scientists often have to study things they cannot observe directly by making inferences from the observations that they can make.  Conclude by letting them see what is inside the box. Option #2: Tell the students the story about the invisible soccer ball adapted from The God Particle, by Leon Ledermen. THE INVISIBLE SOCCER BALL Imagine an intelligent race of beings from the planet Twilo. They look more or less like us, they talk like us, they do everything like humans -- except for one thing. They have a fluke in their visual apparatus. They can't see objects with sharp juxtapositions of black and white. They can't see zebras, for example. Or shirts on NFL referees. Or soccer balls. This is not such a bizarre fluke, by the way. Earthlings are even stranger. We have two lateral blind spots in the center of our field of vision. The reason we don't see these holes is because our brain extrapolates from the information in the rest of the field to guess what should be in these holes, then fills it in for us. Humans routinely drive 100 miles per hour on the autobahn, perform brain surgery, and juggle flaming torches, even though a portion of what they see is merely a good guess. Let's say this contingent from the planet Twilo comes to earth on a goodwill mission. To give them a taste of our culture, we take them to see one of the most popular cultural events on the planet: a World Cup soccer match. We, of course, don't know that they can't see the black-and-white soccer ball. So they sit there watching the match with polite but confused looks on their faces. As far as the Twiloans are concerned, a bunch of short-pantsed people are running up and down the field kicking their legs pointlessly in the air, banging into each other, and falling down. At times an official blows a whistle, a player runs to the sideline, stands there, and extends both his arms over his head while the other players watch him. Once in a great while the goalie inexplicably falls to the ground, a great cheer goes up, and one point is awarded to the opposite team. The Twiloans spend about fifteen minutes being totally mystified. Then, to pass the time, they attempt to understand the game. Some use classification techniques. They deduce, partially because of the clothing, that there are two teams in conflict with one another. They chart the movements of the various players, discovering that each player appears to remain more or less within a certain geographical territory on the field. They discover that different players display different physical motions. The Twiloans, as humans would do, clarify their search for meaning in World Cup soccer by giving names to the different positions played by each footballer. The positions are categorized, compared, and contrasted. The qualities and limitations of each position are listed on a giant chart. A major break comes when the Twiioans discover that symmetry is at work. For each position on Team A, there is a counterpart position on Team B. With two minutes remaining in the game, the Twiloans have composed dozens of charts, hundreds of tables and formulas, and scores of complicated rules about soccer matches. And though the rules might all be, in a limited way, correct, none would really capture the essence of the game. Then one young pipsqueak of a Twiloan, silent until now, speaks his mind. "Let's postulate," he ventures nervously, "the existence of an invisible ball." "Say what?" reply the elder Twiloans. While his elders were monitoring what appeared to be the core of the game, the comings and goings of the various players and the demarcations of the field, the pipsqueak was keeping his eyes peeled for rare events. And he found one. Immediately before the referee announced a score, and a split second before the crowd cheered wildly, the young Twiloan noticed the momentary appearance of a bulge in the back of the goal net. Soccer is a low-scoring game, so there were few bulges to observe, and each was very short-lived. Even so, there were enough events for the pipsqueak to note that the shape of each bulge was hemispherical. Hence his wild conclusion that the game of soccer is dependent upon the existence of an invisible ball (invisible, at least, to the Twiloans). The rest of the contingent from Twilo listen to this theory and, weak as the empirical evidence is, after much arguing, they conclude that the youngster has a point. An elder statesman in the group a physicist, it turns out observes that a few rare events are sometimes more illuminating than a thousand mundane events. But the real clincher is the simple fact that there must be a ball. Postulate the existence of a ball, which for some reason the Twiloans cannot see, and suddenly everything works. The game makes sense. Not only that, but all the theories, charts, and diagrams compiled over the past afternoon remain valid. The ball simply gives meaning to the rules. This is an extended metaphor for many puzzles in physics, and it is especially relevant to particle physics. We can't understand the rules (the laws of nature) without knowing the objects (the ball) and, without a belief in a logical set of laws, we would never deduce the existence of all the particles. Discussion Questions: How was the vision of the Twiloans different from human vision? How did the Twiloans see the game of soccer differently? What observations did the Twiloans make as they watched the game? What tools did the Twiloans use to determine the presence of a ball? How can we relate the story of the Twiloans to the study of matter? KWL Chart: Ask the students to make a KWL chart about ways to identify substances. Have the students share some of the things they KNOW about identifying substances. Write these things on a large piece of chart paper. Then, ask the students to share some of the things they WANT to know about identifying substances, and write their ideas on the chart paper. Tell the students that you will post the paper in the classroom to refer to as you study how we study the structure of matter and how we identify the components of matter. The students need to keep their KWL chart to add to as they complete the unit on the structure of matter. Use the following questions as a guide to create the know column of the KWL chart. What particles make up matter? What particles make up an atom? How do we know these particles exist? How do scientists make observations about things they cannot see? What is a model? How has our model of the atom evolved over time? How has the evolution of technology improved our understanding of the structure of the atom? EXPLORE: The Science Spot Website is loaded with great activities on a variety of science-related topics. There are teacher lesson plans, resources, and student links. Use the Atoms Family Worksheets ( HYPERLINK "http://www.sciencespot.net/Media/atomsfam.pdf" http://www.sciencespot.net/Media/atomsfam.pdf) for the students to explore the structure of the atom. On the board or overhead, show the students how to determine the protons, neutrons, and electrons using the atomic number and the atomic mass. Then have the students to make a model of an atom using a cookie as an atom. See handout Atomic Cookies. Atomic Cookie Teacher Notes Any kind of sprinkles can be substituted for the types of sprinkles noted in this lab. The teacher may choose to draw the rings on the cookie with writing icing or he/she may choose to have the students do so. Example: See attached document for use as a transparency. EXPLAIN: Show the students The Phantoms Portrait Parlor: Spectroscope of an Atom at the following website:  HYPERLINK "http://www.miamisci.org/af/sln/phantom/spectroscope.html" http://www.miamisci.org/af/sln/phantom/spectroscope.html. Discuss the idea of atomic structure using the PowerPoint, HYPERLINK "Final Version of PowerPoints\\Atomic_Structure_part_III_revised_6_10.ppt"Atomic Structure. If you do not have access to a projector, you can print out a class set of handouts from the PowerPoint for students to look at as you discuss. Ask the student to complete the handout of notes as you present the PowerPoint. Use the handout The Bohr Model and Atomic Structure to practice finding the number of protons, neutrons, and electrons. Then, use the Atoms Family Atomic Math Challenge Worksheets to further explain the structure of the atom and for more practice with protons, neutrons, and electrons ( HYPERLINK "http://www.sciencespot.net/Media/atomicmath.pdf" http://www.sciencespot.net/Media/atomicmath.pdf - student element worksheet). Play Atomic Musical Chairs using the directions on the following website:  HYPERLINK "http://www.middleschoolscience.com/atomicmusicalchairs.pdf" http://www.middleschoolscience.com/atomicmusicalchairs.pdf ELABORATE: Use the following activity as a simulation of Democritus exploration and naming of the atom. Ask the students, If a piece of matter is broken in half, and then in half again, how many times can it be broken before it can no longer be broken? Pass out one cheese cube and a plastic knife for every pair of students. Tell the students to divide the cheese into two pieces. Ask: Is each half still cheese? Can they be divided any further? Tell the students to divide each half into two pieces. Ask: Can the pieces of cheese be divided any further? Can the pieces be divided in half indefinitely? Tell the students to continue to cut the cheese cubes in half as much as they can. Ask: Is there a point when the cheese can no longer be divided and still be called cheese? What can we call these small pieces of cheese that make up the cheese cube? Democritus thought it ended at some point at the smallest piece of matter. He called this smallest piece atomos, which means indivisible. Research: Make a timeline of the history of the model of the atom to show how the model evolved to what we have today. The following websites can be used to make a timeline. See the student handout Atomic Model Timeline for the timeline notes.  HYPERLINK "http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/page.htm" http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/page.htm  HYPERLINK "http://www.cartage.org.lb/en/themes/Sciences/Physics/Atomicphysics/Atomicstructure/AtomicTimeline/AtomicTimeline.htm" http://www.cartage.org.lb/en/themes/Sciences/Physics/Atomicphysics/Atomicstructure/AtomicTimeline/AtomicTimeline.htm Product: Ask the students to pick one of the people on the timeline to do further research for making a Trading Card. Use the student handout Trading Cards for the History of the Atomic Model for directions. Optional Products: Students can choose to do one of the following products instead. Choose one of the scientists from the timeline. Create a resume for the scientist as if he were about to apply for a job.   SHAPE \* MERGEFORMAT  Design a commemorative stamp or coin that illustrates the scientist's accomplishments and would be issued by his native country. Write an obituary notice that outlines one of scientists accomplishments throughout his lifetime. EVALUATE: Choose one or more of the following activities: Ask the students to build a 3-D model of an atom for an element. Have them include a label with their model that gives the element name, atomic number, atomic mass, and symbol. Ask the students to design a in a timeline of the history of the model of the atom. Ask the students to complete the sheet, History of the Model of the Atom, about 4 of the main scientists. Ask the students to research the field of Theoretical Chemistry. Have them to complete the Four Corner Research Sheet to share what they learned. Ask the students to write a summary of this unit for the KWL chart to show what they have learned. Questions for Review: What particles make up matter? What particles make up an atom? How do we know these particles exist? How do scientists make observations about things they cannot see? What is a model? How has our model of the atom evolved over time? How has the evolution of technology improved our understanding of the structure of the atom?  SHAPE \* MERGEFORMAT  Additional Resources The following links are for atomic structure and the historical perspective of the model of the atom activities.  HYPERLINK "http://www.watertown.k12.wi.us/HS/Staff/Buescher/atomtime.php" http://www.watertown.k12.wi.us/HS/Staff/Buescher/atomtime.php  HYPERLINK "http://molaire1.club.fr/e_histoire.html" http://molaire1.club.fr/e_histoire.html  HYPERLINK "http://www.miamisci.org/af/sln/phantom/spectroscope.html" http://www.miamisci.org/af/sln/phantom/spectroscope.html This site has several mini-lessons on atomic structure that are interactive. Basic structure of matterinteractive with animation  HYPERLINK "http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/basicstructure.htm" http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/basicstructure.htm Great Site: Atomic structuregreat animation  HYPERLINK "http://science.howstuffworks.com/atom.htm" http://science.howstuffworks.com/atom.htm Quiz on Atomic Models:  HYPERLINK "http://www.quia.com/jq/47858.html" http://www.quia.com/jq/47858.html (need Java) This website has interactive games and tutorials for several topics in chemistry:  HYPERLINK "http://www.echalk.co.uk/science/tasters/chemistry/atomicstructure.pdf" http://www.echalk.co.uk/science/tasters/chemistry/atomicstructure.pdf ENGAGE, Part 3 Name ___________________________________ Handout Date ____________________________________ KWL Chart We are studying .Structure of M A T T E R! What I KNOW about matter: What I WANT to know about matter:What I LEARNED about matter:1. What particles make up matter? 2. What particles make up an atom? 3. How do we know these particles exist? 4. How do scientists make observations about things they cannot see? 5. What is a model? How has our model of the atom changed over time? 6. How has the evolution of technology improved our understanding of the structure of the atom? EXPLORE, Part 3 Name ___________________________________ Handout Date ____________________________________ Atomic Cookies Purpose: To introduce the structure of the atom and to understand the arrangement of subatomic particles. (SCOS Objectives: 4.03, 4.02 ) Materials: Cookies (atom) Icing (strong forces) Chocolate sprinkles (electrons) Multi-colored sprinkles (protons) Perils (neutrons) Atomic cookie cards Writing icing (to draw rings) Paper towels Procedure: Obtain an Atomic Cookie Card for the model. Using the information discussed in the Matterville story, determine the number of protons, electrons, and neutrons for your atom. Record this information in the data section. Determine the identity of your atom using this information. Once you have cleared your information from steps 2 and 3 with your teacher, obtain your atom (cookie). Ice your cookie (bringing in the strong forces). Have your teacher draw the rings on your atom (cookie). Count out the number of each type of sprinkles according to your calculations in step #2. Place the sprinkles on the appropriate position of the atom. Before you eat your cookie, your teacher should check your atom. Data Section: Element NameProtonsNeutronsElectronsSymbolAtomic NumberAtomic MassCookie 1Cookie 2 Teacher Initial _________ Look on the periodic table that your teacher gave you and find your atomic cookies element. Record the atomic number and the atomic mass for your elemental cookie. Analysis: What accounts for most of the mass of the atom? What accounts for most of the volume of the atom? What two subatomic particles must be the same to maintain a neutral atom? What subatomic particle determines the identity of the element? What would happen to the morale of Matterville if one of the Enraged Elliot Electrons was kidnapped? What would happen to the morale of Matterville if one of the Perky Patty Protons was kidnapped? What would happen to the morale of Matterville if one of the Nerdy Nelda Neutrons was kidnapped? EXPLORE, Part 3 Cards Atomic Cookies # of Residents= 51 amu (mass #) # of Positive Sisters= 23 (atomic #)  Atomic Cookies # of Residents = 2 amu (mass #) # of Positive Sisters = 1 (atomic #)  Atomic Cookies # of Residents = 13 amu (mass #) # of Positive Sisters = 6 (atomic #)  Atomic Cookies # of Residents = 32 amu (mass #) # of Positive Sisters = 17 (atomic #)  Atomic Cookies # of Residents = 45 amu (mass #) # of Positive Sisters = 21 (atomic #)  Atomic Cookies # of Residents = 55 amu (mass #) # of Positive Sisters = 25 (atomic #)  Atomic Cookies # of Residents = 59 amu (mass #) Positive Sisters= 27 (atomic #)  Atomic Cookies # of Residents = 64 amu (mass #) # of Positive Sisters = 29 (atomic #)  Atomic Cookies # of Residents= 20 amu (mass #) # of Positive Sisters= 10 (atomic #)  Atomic Cookies # of Residents = 4 amu (mass #) # of Positive Sisters = 2 (atomic #)  Atomic Cookies # of Residents = 40 amu (mass #) # of Positive Sisters = 18 (atomic #)  Atomic Cookies # of Residents = 32 amu (mass #) # of Positive Sisters = 16 (atomic #)  Atomic Cookies # of Residents = 7 amu (mass #) # of Positive Sisters = 3 (atomic #)  Atomic Cookies # of Residents = 52 amu (mass #) # of Positive Sisters = 24 (atomic #)  Atomic Cookies # of Residents = 28 amu (mass #) Positive Sisters= 14 (atomic #)  Atomic Cookies # of Residents = 32 amu (mass #) # of Positive Sisters = 16 (atomic #)  Atomic Cookies # of Residents= 3 amu (mass #) # of Positive Sisters= 1 (atomic #)  Atomic Cookies # of Residents = 18 amu (mass #) # of Positive Sisters = 8 (atomic #)  Atomic Cookies # of Residents = 31 amu (mass #) # of Positive Sisters = 15 (atomic #)  Atomic Cookies # of Residents = 11 amu (mass #) # of Positive Sisters = 5 (atomic #)  Atomic Cookies # of Residents = 23 amu (mass #) # of Positive Sisters = 11 (atomic #)  Atomic Cookies # of Residents = 24 amu (mass #) # of Positive Sisters = 12 (atomic #)  Atomic Cookies # of Residents = 39 amu (mass #) Positive Sisters= 19 (atomic #)  Atomic Cookies # of Residents = 9 amu (mass #) # of Positive Sisters = 4 (atomic #)  Atomic Cookies # of Residents= 12 amu (mass #) # of Positive Sisters= 6 (atomic #)  Atomic Cookies # of Residents = 14 amu (mass #) # of Positive Sisters = 6 (atomic #)  Atomic Cookies # of Residents = 16 amu (mass #) # of Positive Sisters = 8 (atomic #)  Atomic Cookies # of Residents = 40 amu (mass #) # of Positive Sisters = 20 (atomic #)  Atomic Cookies # of Residents = 14 amu (mass #) # of Positive Sisters = 7 (atomic #)  Atomic Cookies # of Residents = 27 amu (mass #) # of Positive Sisters = 13 (atomic #)  Atomic Cookies # of Residents = 35 amu (mass #) Positive Sisters= 17 (atomic #)  Atomic Cookies # of Residents = 19 amu (mass #) # of Positive Sisters = 9 (atomic #)  EXPLAIN, Part 3 Name ___________________________________ Handout Date ____________________________________ Atomic Structure What is an atom? Atom:_________________________________________________________ ______________________________________________________________ First proposed by _____________________. Atomic Structure Atoms are composed of 2 regions: _____________: the center of the atom that contains the mass of the atom ________________ ______________ : the region that surrounds the nucleus that contains most of the space in the atom     Whats in the nucleus? The nucleus contains 2 of the 3 subatomic particles. ____________: positively charged subatomic particles ____________: neutrally charged subatomic particles Whats in the electron cloud? The ________ subatomic particle resides outside of the nucleus in the __________ __________. Electron: the ____________ particle with a __________ charge and relatively no __________. How do these particles interact? Protons and neutrons live compacted in the tiny _______ charged nucleus accounting for all of the ________ of the atom. The negatively charged _____________ are small and have relatively no mass but occupy a large _____________ of space outside of the nucleus. How do the subatomic particles balance each other? In an atom: ________________ = __________________ If ______ protons are present in an atom then _______ electrons are there to balance the overall charge of the atomatoms are _______________. The neutron have _____ charge therefore they do not have to equal the number of protons or electrons. How do we know the number of subatomic particles in an atom? Atomic number: indicates the number of ___________ in an atom. Ex: hydrogens atomic number is 1, so hydrogen has _______ proton. Ex: carbons atomic number is ______, so carbon has _____ protons. **The number of ___________ identifies the atom 2 p = ________ 29 p = _______ How do we know the number of subatomic particles in an atom? ____________ number: the number of protons and neutrons in the nucleus. Ex: hydrogen can have a mass of ________. Since it has 1 proton, it must have 2 neutrons. **number of neutrons = ________ # - ________ # Determining the number of protons and neutrons: Li has a mass # of 7 and an atomic number of 3 Protons = 3 ( same as the __________ #) Neutrons = 7 3 = 4 (__________ # - _________ #) Ne has a mass number of 20 and an atomic number of 10. Protons = _______ Neutrons = ______ What about the electrons? The electrons are equal to the number of ___________. So ____ = ____ = __________ number Ex: He has a mass number of 4 and an atomic number of 2 p = ______ n = _______ e-= ______ Determine the number of subatomic particles in the following: Cl has a mass number of 35 and an atomic number of 17 P = ______ n = _______ e- = ______ K has a mass number of 39 and an atomic number of 20. P = ______ n = _______ e- = ______ How exactly are the particles arranged? Bohr Model of the atom:      What does carbon look like? Mass # __________ Atomic # ________    p = ______ n = _________ e- = _________ EXPLAIN, Part 3 Name ___________________________________ Handout Date ____________________________________ The Bohr Model and Atomic Structure    ELABORATE, Part 3 Name ___________________________________ Handout Date ____________________________________ Atomic Model Timeline DateScientistDevelopment of the Atomic Model                        How do you think the model of the atom will change in the next 100 years? ______________________________________________________________________ ______________________________________________________________________ ELABORATE, Part 3 Name ___________________________________ Handout Date ____________________________________ Trading Cards for the History of Atomic Models Scientist /philosopher ____________________________________________________ Background Birth date _______________________ Death date ______________________ Place of birth _____________________________________________________ Family information: married? _______________________ children __________ Education / degrees _____________________________________________________ ________________________________________________________________ Scientific accomplishments and awards (with dates) ____________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ Design a trading card for your scientist with the following requirements: Use a 3x5 index card or the computer (MS Publisher) to design your card. Front: Show life dates, statistics, and a picture of the scientist. Back: Show education information and scientific accomplishments. EVALUATE, Part 3 Name ___________________________________ Handout Date ____________________________________ History of the Model of the Atom Read about each scientist. Then answer the questions that follow. John Dalton (1766-1844) was an English chemist. His ideas form the atomic theory of matter. Here are his ideas. All elements are composed (made up) of atoms. It is impossible to divide or destroy an atom. All atoms of the same elements are alike. (One atom of oxygen is like another atom of oxygen.) Atoms of different elements are different. (An atom of oxygen is different from an atom of hydrogen.) Atoms of different elements combine to form a compound. These atoms have to be in definite whole number ratios. For example, water is a compound made up of 2 atoms of hydrogen and 1 atom of oxygen (a ratio of 2:1). Three atoms of hydrogen and 2 atoms of oxygen cannot combine to make water. 1. What is the name of his theory? ______________________________________________________________ 2. What are elements made of? ______________________________________________________________ 3. An atom of hydrogen and an atom of carbon are ______________________. 4. What are compounds made of ? ___________________________________ 5. The ratio of atoms in HCl is a. 1:3 b. 2:1 c. 1:1 J.J. Thompson (Late 1800s) was an English scientist. He discovered the electron when he was experimenting with gas discharge tubes. He noticed a movement in a tube. He called the movement cathode rays. The rays moved from the negative end of the tube to the positive end. He realized that the rays were rays were made of negatively charged particles electrons. 1. What did J.J. Thompson discover? ________________________________________________________________ 2. What is the charge of an electron? ________________________________________________________________ 3. What are cathode rays made of? ________________________________________________________________ 4. Why do electrons move from the negative end of the tube to the positive end? ________________________________________________________________ What was Thompson working with when he discovered the cathode rays? ________________________________________________________________ Lord Ernest Rutherford (1871-1937)conducted a famous experiment called the gold foil experiment. He took a thin sheet of gold foil. He used special equipment to shoot alpha particles (positively charged particles) at the gold foil. Most particles passed straight through the foil like the foil was not there. Some particles went straight back or were deflected (went in another direction) as if they had hit something. The experiment shows: atoms are made of a small positive nucleus; positive nucleus repels (pushes away) positive alpha particles; atoms are mostly empty space. What is the charge of an alpha particle? ______________________________________________________________________ Why is Rutherfords experiment called the gold foil experiment? ______________________________________________________________________ 3. How did he know that atom was mostly empty space? ______________________________________________________________________ What happened to the alpha particles as they hit the gold foil? ______________________________________________________________________ How did he know that the nucleus was positively charged? ______________________________________________________________________ Niels Bohr (Early 1900s) was a Danish physicist. He proposed a model of the atom that is similar to the model of the solar system. The electrons go around the nucleus like planets orbit around the sun. All electrons have their energy levels a certain distance from the nucleus. Each energy level can hold a certain number of electrons. Level 1 can hold 2 electrons, Level 2 8 electrons, Level 3 18 electrons, and Level 4 32 electrons. The energy of electrons goes up from Level 1 to other levels. When electrons release (lose) energy they go down a level. When electrons absorb (gain) energy, they go to a higher level. Why could Bohrs model be called a planetary model of the atom? ____________________________________________________________________________________________________________________________________________ How many electrons can the fourth energy level hold? ____________________________________________________________________________________________________________________________________________ Would an electron have to absorb or release energy to jump from the second energy level to the third energy level? ____________________________________________________________________________________________________________________________________________ For an electron to fall from the third energy level to the second energy level, it must ________________________ energy.  Topic: Theoretical Chemistry  What is Who first theoretical developed chemistry? theoretical chemistry? Where do we use theoretical Why is it chemistry? important? Terms Used in Part 3 Atom: The smallest unit of matter that retains the identity of the substance. Proton: subatomic particle with a positive charge and located in the nucleus of the atom. The number of protons gives the atom its identity. Neutron: subatomic particle with no charge, the same mass as a proton, and located in the nucleus of the atom. Electron: subatomic particle with a negative charge and located outside the nucleus. Atomic number: the number of protons in the nucleus of an atom. This number identifies the atom. Atomic mass: the average mass number of all isotopes of an atom. Round this number to find the mass number of the atom. Mass number: the number of protons and neutrons in the nucleus of an atom. Mass number = protons + neutrons Matter All Around Us Part 4: Elements and the Periodic Table Purpose: To develop a basic understanding of the elements, the arrangement of the elements of the periodic table, and how this arrangement is related to the properties of the elements. GOAL / OBJECTIVE Goal 1: The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry. Objectives 1.01, 1.05, 1.08, 1.09, 1.10 Goal 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry. Objectives 4.02, 4.04, 4.05, 4.06  ENGAGE: Walk-Around Calendar Activity Place calendars around the room at stations with a piece of chart paper of questions at each station. Have the students respond to the questions on the chart paper in small groups. Allow the students 3-4 minutes at each station for response. Note to Teacher Place several different types of calendars at Station 1. Write the following questions on the chart paper at each station. There is an optional handout you can use for student responses. Station 1 Question(s): What is the benefit of organizing days, weeks, months, etc with a calendar? Are all calendars organized in the same way? Station 2 Question(s): How are the rows of a calendar arranged? What is always the same about the rows? What can be different about the rows? Station 3 Question(s): How are the columns of a calendar arranged? What is always the same about the columns? What can be different about the columns? Station 4 Question(s): What is the significance of the numbers in the boxes? Do these numbers always occur in the same boxes? Station 5 Question(s): What is the significance of the writing (Ex: Columbus Day) in the boxes? Does the information change with each box? Does it change with each day? Each month? Station 6 Question(s): How do holidays fit into the calendar? Why do you think some holidays are the same date every year and others change? For example, Christmas is December 25 and Thanksgiving is the 4th Thursday in November. Station 7 Question(s): Think of other things that arranged in a similar way. Describe or draw the arrangement. When students have completed this activity, discuss answers as a class. Bring out the importance of the continuity of the rows as weeks and the columns as days of the week. Discuss the significance of numbers notating the numbered day of the month and the information in the box is specific to that day. Relate this organization to the way in which we organize the elements on the periodic table and check that students understand what the periodic table is and what it is used for.(i.e.: Columns on the periodic tables are families. Rows on the periodic table are called periods. Elements in the same family share similar chemical properties. Elements in the same row have the same number of energy levels.) Ask the students to make a KWL chart about elements and the periodic table. Have the students share some of the things they KNOW about elements and the periodic table. Write these things on a large piece of chart paper. Then ask the students to share some of the things they WANT to know about elements and the periodic table, and write their ideas on the chart paper. Tell the students that you will post the paper in the classroom to refer to as they learn how we study the elements and the periodic table. The students need to keep their KWL chart to add to as they complete the unit on the structure of matter. Use the following questions as a guide to create the know column of the KWL chart. Why are the elements arranged as they are in the periodic table? What do the atomic number and the atomic mass have to do with this arrangement of the elements? What is a period? What is a family? How can the arrangement of the elements on the periodic table be used to identify their properties? How can the periodic table be used to predict the properties of undiscovered elements? EXPLORE: Option 1: The students will construct a giant periodic table by creating match book foldables for each element on the periodic table. Students will research 2-3 elements, depending on the number of students you teach. Each student will find the elements symbol, name, atomic number, atomic mass, boiling point, melting point, state at STP, history (who discovered the element, when it was discovered, how it was discovered), and interesting information (how we use the element and where we find the element). Have students determine the classification of their element and print their information on the appropriate color of paper. (See below.) Students can type their information in the  HYPERLINK "Element%20Matchbook.doc" template provided. This allows for a visual periodic table that separates the elements by families. White: Hydrogen Yellow: Alkali Metals Orange: Alkaline Earth Metals Green: Transition Metals Light Green: Actinides Bright Green: Lanthanides Blue: Other Metals Pink: Semi-Metals Purple: Halogens Red: Noble Gases Light Blue: Other Nonmetals *Colors may be changed according to availabilityprovide the key to the meaning of the colors.  SHAPE \* MERGEFORMAT  Option 2: Element Cube Assign each student an element to research. Give the students the template for the cube to fill in as they research their element. You can run the cubes in different colors as stated above to group the cubes in families. Provide scissors and glue or tape for the students to assemble their cube when they are finished with their research. Each student should present their element to the class. Then, you can hang the cubes in the classroom. EXPLAIN: Use the PowerPoint HYPERLINK "Final Version of PowerPoints\\The_Periodic_Table_part_4_revised_5-30.ppt"The Periodic Table to explain how the periodic table is organized. Ask the student to complete the handout of notes as you present the PowerPoint. (If you do not have access to a projector, you can print out a class set of handouts from the PowerPoint for students to look at as you discuss.) Give students the worksheet Understanding the Periodic Table of Elements with 3 blank periodic tables. These periodic tables will be used to build an understanding of the elements. The students should color each table as directed and provide a key to the meaning of the colors. This activity may be done individually or in cooperative learning groups. Note to teacher Use the following directions for the completion of each periodic table: Periodic Table 1: States of Matter Have students use books and information from the explore activity to label and color the following: solids at STP (red) liquids at STP (blue) gases at STP (yellow) Periodic Table 2: Have students use books and information from the explore activity to label and color the following: metals (orange) nonmetals (pink) semi-metals/metalloids (green) valence electrons charges (oxidation numbers) Periodic Table 3: Families of Elements Have students use books and information from the explore activity to label and color the following: alkali metals (yellow) alkaline earth metals (orange) transition metals (green) boron group (light blue) carbon group (dark blue) nitrogen group (brown) oxygen group (gray) halogens (purple) noble gases (red) lanthanides (blue green) actinides (light green) As a class, discuss this information after the activity has been completed. Take time to explain the meaning of valence electrons and the octet rule (how we obtain the oxidation numbers).  SHAPE \* MERGEFORMAT  Optional Activity to integrate reading: You can print the reading passage and lesson activity from the Arizona Department of Education at the following website:  HYPERLINK "https://www.ideal.azed.gov/system/files/PeriodicTableLesson.pdf" https://www.ideal.azed.gov/system/files/PeriodicTableLesson.pdf Note to Teacher: I have not been able to get the website above to link properly. I found this site by typing in a Google search for history of the periodic table lesson. If you cannot click on the link and open it, you may have to get it this way as well. We are in the process of getting permission to use this activity. ELABORATE: Ask the students if they have watched the X-Men movie. Discuss some of the powers the characters have. Then ask the students to create a superhero or villain made of an element (similar to comic characters or X-Men). The character creation must include properties of the element incorporated into the description of the superhero or villain. Their product can be a drawing of their character, a doll dressed as their character, or they can dress up themselves as the character. They must also include a character description. A rubric is included to assess this activity. Guidelines for character eescription: Creative name of superhero/villain and the superheros/villains alter ego (i.e. Superman/ Clark Kent) Description of the element and properties that give them their powers. Brief description of how your superhero acquired, used, or lived with their element power. EVALUATE: Students will go on a treasure hunt through the school (or class if necessary). We recommend purchasing disposable cameras or using digital cameras and having the students work in small groups. The students should take pictures of their answers. They will then make a scrapbook with the question and picture answer. Give the Treasure Island handout to students with a list of questions to use. The students will make a PowerPoint presentation with the questions and pictures they have taken. An iMovie could also be made if your school has that capability. Ask the students to write a paragraph to answer the following: Why do elements in the same group have similar properties? Why do elements in the same rows have similar properties? Ask the students to write a summary of this unit for the KWL chart to show what they have learned. Use the following guiding questions to prompt students what to include in their summaries: Why are the elements arranged as they are in the periodic table? What does the atomic number and atomic mass have to do with this arrangement of the elements? What is a period? What is a family? How can the placement of elements on the periodic table help to identify their properties? How can the periodic table be used to predict the properties of undiscovered elements?  SHAPE \* MERGEFORMAT  Additional Resources The following links are for periodic table activities.  HYPERLINK "http://www.zeuscat.com/andrew/javascript/periodic.html" Extensive Periodic Table - Extensive information  HYPERLINK "http://www.bayerus.com/msms/fun/pages/periodic/i_table.html" Interactive Periodic Table - Interactive Periodic table from the makers of Bayers Aspirin (can be downloaded)  HYPERLINK "http://education.jlab.org/itselemental/" It's an Elemental Periodic Table - Created by Jefferson Labs, an accelerator facility  HYPERLINK "http://www.chemicalelements.com/index.html" Online, Interactive Periodic Table - Created by an eighth grader as a science project!  HYPERLINK "http://chemlab.pc.maricopa.edu/periodic/periodic.html" Periodic Table - This site has a lot of information!  HYPERLINK "http://education.jlab.org/indexpages/elementgames.php" http://education.jlab.org/indexpages/elementgames.php Games on the Jefferson Website  HYPERLINK "http://edtech.kennesaw.edu/web/matter.html" http://edtech.kennesaw.edu/web/matter.html resources galore!  HYPERLINK "http://www.usask.ca/education/coursework/mcvittiej/bio30unit1/lessons.htm" http://www.usask.ca/education/coursework/mcvittiej/bio30unit1/lessons.htm atomic structure  HYPERLINK "http://www.privatehand.com/flash/elements.html" http://www.privatehand.com/flash/elements.html -- animated elements to introduce the periodic table AIMS Activity Fabulous Eggs  HYPERLINK "http://web.buddyproject.org/web017/web017/history.html" http://web.buddyproject.org/web017/web017/history.html  HYPERLINK "http://www.docbrown.info/page03/3_34ptable/PThistoryQ.htm" http://www.docbrown.info/page03/3_34ptable/PThistoryQ.htm ENGAGE, Part 4 Name ___________________________ Handout Date ____________________________ Walk-Around Calendar Activity StationQuestions and Responses 1What is the benefit of organizing days, weeks, months, etc. with a calendar? Are all calendars organized in the same way?  2How are the rows of a calendar arranged? What is always the same about the rows? What can be different about the rows?  3How are the columns of a calendar arranged? What is always the same about the columns? What can be different about the columns? 4What is the significance of the numbers in the boxes? Do these numbers always occur in the same boxes? 5What is the significance of the writing in the boxes (Ex. Columbus Day)? Does the information change with each box? Does it change with each day? Each month? 6How do holidays fit into the calendar? Why do you think some holidays are the same day every year and others change? For example, Christmas is December 25 and Thanksgiving is the 4th Thursday in November. 7Think of other things that are arranged in a similar way. Describe or draw the arrangement.  ENGAGE, Part 4 Name ___________________________________ Handout Date ____________________________________ KWL Chart We are studying .Elements and the Period Table What I KNOW about elements and the periodic table:What I WANT to know about elements and the periodic table:What I LEARNED about elements and the periodic table:1. Why are the elements arranged as they are in the periodic table?2. What do the atomic # and atomic mass have to do with this arrangement of the elements? 3. What is a period? 4. What is a family? 5. How can the arrangement of the elements on the periodic table be used to identify their properties?6. How can the periodic table be used to predict the properties of undiscovered elements? EXPLORE, Part 4 Element Cube Handout  INCLUDEPICTURE "http://www.mathsisfun.com/geometry/images/cube-model.gif" \* MERGEFORMATINET  EXPLAIN, Part 4 Name ___________________________________ Handout Date ____________________________________ The Periodic Table Unit 2: Part 4 The Father of the Periodic TableDimitri Mendeleev _____________ was the first scientist to notice the relationship between the ______________. Arranged his periodic table by _______ _______ Said properties of __________ elements could be predicted by properties of elements around the missing element. ____________ later discovered that the periodic nature of the elements was associated with ________ ________ not atomic mass The Periodic Table   SHAPE \* MERGEFORMAT  What does the information in the box tell me?  SHAPE \* MERGEFORMAT  Metals, Nonmetals, and Metalloids   SHAPE \* MERGEFORMAT  Groups of the Periodic Table Group 1: The ________ Metals Most __________ metals on the PT Rarely found ______ in nature Charge of ___-___ valence electron Group 2: The __________ __________ Metals Still quite ____________ Charge of ___-___ valence electrons Groups of the Periodic Table Groups 3-12: The ______________ Metals Found ________ and in ___________ in nature Charge is usually ____ but can ________-usually ____ valence electrons Group 13: ___________ Family Charge is ____-____ valence electrons Groups of the Periodic Table Group 14: The __________ Family Contains elements that can form unusual bonds (___________ and __________) Charge is _____ or _____-contains _____ valence electrons Group 15: The ________ Family Charge is ______-contains ____ valence electrons Groups of the Periodic Table Group 16: The ________ Family Also known as the ___________ Charge is ____ -____ valence electrons Group 17: The ___________ Most __________ nonmetals Charge is ____-____ valence electrons Group 18: The _________ Gases (The ________ Gases) ______________ Charge is _____-_____ or ______ valence electrons Special Rows on the Periodic Table   SHAPE \* MERGEFORMAT  EXPLAIN, Part 4 Name ___________________________________ Handout Date ____________________________________ Understanding the Periodic Table of Elements Part 1: States of Matter of the Elements  In what state of matter do most of the elements of the periodic table exist? __________ Part 2: Kinds of Elements  Where on the periodic table are the metals located? ___________________________ Where on the periodic table are the nonmetals located? ________________________ List the metalloids. _____________________________________________________________________ Part 3: Families of Elements   The element hydrogen should not be colored. It stands apart from the rest of the elements because its properties do no match any other single group. Its the most abundant element in the universe and is highly reactive. Rows of the periodic table are called __________________. How many periods are on the table? ________ Columns of the periodic table are called _______________. Part 4: History of the Periodic Table Who discovered a pattern to the elements in 1869? ____________________________ He is called the Father of the Periodic Table. His periodic table organized the elements according to increasing _____________________________________. What method did he use to organize the elements? ____________________________ ______________________________________________________________________ The modern periodic table organizes the elements according to __________________. Who developed our modern periodic table? ___________________________________ ELABORATE: Part 4 Name ________________________________ Handout Date _________________________________ Creating a Superhero or Villain Character Purpose: To create a superhero or villain element character. Your superhero or villain will have characteristics and an appearance associated with a chosen element. Task: For this project you will need to research one of the elements in the periodic table. When you write a character sketch, you are trying to introduce the reader to someone. You want the reader to have a strong mental image of the person, to know how the person talks, to know the person's characteristic ways of doing things, to know something about the person's value system. Character sketches only give snapshots of people; therefore, you should not try to write a history of the person. Audience: X-Men Movie producers looking for new characters for the next movie Procedure: Select an element from the periodic table for your character. Research the properties and periodic table information for your element. Decide whether your character will be a superhero or a villain. Complete the information on the chart below. Decide on the product you will present to the movie producer: a drawing of your character, a doll dressed as your character, or you will dress as your character. Write a character description. Present your superhero or villain to the class. Superhero or villain?What is your characters name? What element gives the power?Periodic Table Info What are the properties of the element? Element Name ___________________Symbol _______ Atomic Number ________ Atomic Mass ____________ Properties (at least 3): ________________________________________ ________________________________________ ________________________________________ ________________________________________ How is the element used?Uses (at least 2): ________________________________________ ________________________________________ ________________________________________  Description of how your character acquired and lives with his/her power.  Powers - strengths or weaknesses based on elemental properties  What does the character look like? Think about the color and state of the element. How old is he/she?  Why should your character be included in the next X-Men Movie?  ELABORATE, Part 4 Name ___________________________ Handout Date ____________________________ Rubric for Cartoon Superhero or Villain Character 4321Character Clear identity. Powers are very appropriate.Clear identity. Powers are appropriate.Identified, but powers are too general.Hard to tell who the characters are or what powers are present. Periodic Table Information No errors noted.1-3 errors noted.4-5 errors noted.More than 5 errors.Uses of Element3 or more noted.2 noted.1 noted.O noted. Content Properties of the element are clearly explained.Properties of the element are explained.Properties of the element are partially explained. Properties of the element are not explained. Creativity Outstanding display of concept.Good display of concept.Adequate display of concept.Poor display of concept.Spelling, Punctuation, GrammarNo errors noted.1-3 errors noted.4-5 errors noted.More than 5 errors.Drawing, Doll, or Dress UpClearly shows character and powers.Shows character and powers.Adequate display of character and powers.Poor display of character and powers. EVALUATE, Part 4 Name ___________________________________ Handout Date ____________________________________ TREASURE HUNT Take pictures of the following for your scrapbook. Organize your scrapbook using the questions and photographs. Find something that contains the explosive metal in period 3, group 1 and the poisonous yellow halogen in period 3. Find something that contains a soft orange-colored transition metal in period 4. Find something that contains both the semi-metal in period 3, family 14 and the nonmetal found in period 2, group 16. Find something that contains only the element found in period 2 and group 14. Find something that contains a compound with the element found in period 4, group 1. Find something that contains the element that doesnt seem to fit any group perfectly and the nonmetal found in period 2, group 16. Find something made of the element that has an atomic number of 79. Find something that contains the only solid halogen. Find something that contains the element that has a mass of 40.08 amu. Find something that contains the element that rusts. Other: ____________________________________________________________ EVALUATE, Part 4 Name ___________________________________ Handout (with answers) Date ____________________________________ TREASURE HUNT Take pictures of the following for your scrapbook. Organize your scrapbook using the questions and photographs. Find something that contains the explosive metal in period 3, group 1 and the poisonous yellow halogen in period 3. (salt packet from cafeteria) Find something that contains a soft orange-colored transition metal in period 4. (penny) Find something that contains both the semi-metal in period 3, family 14 and the nonmetal found in period 2, group 16. (mirror in the bathroom) Find something that contains only the element found in period 2 and group 14. (pencil lead) Find something that contains a compound with the element found in period 4, group 1. (banana from cafeteria) Find something that contains the element that doesnt seem to fit any group perfectly and the nonmetal found in period 2, group 16. (water fountain) Find something made of the element that has an atomic number of 79. (gold ring) Find something that contains the only solid halogen. (Iodine solutiontincture of iodine) Find something that contains the element that has a mass of 40.08 amu. (carton of milk from the cafeteria) Find something that contains the element that rusts. (a nail) Other: ______________________________________________________ Terms Used in Part 4 Element: A substance that cannot be broken down into simpler substances by ordinary chemical means. Periodic Table: An arrangement of elements in order of increasing atomic numbers that demonstrates the periodic patterns that occur among the elements. Period: Elements that occur in a horizontal row on the periodic table Group: Elements that occur in a vertical column on the periodic table; also called a family. Metal: An element below and to the left of the stair-step line of metalloids; about 80% of the known elements are metals. Nonmetal: An element above and to the right of the stair-step line of metalloids. Metalloid: An element with properties of both metals and nonmetals located along the stair-step line on the right side of the periodic table. Matter All Around Us Part 5: Mixtures, Compounds, and Reactions Purpose: To understand that elements combine in many ways to form compounds. GOAL / OBJECTIVE Goal 1: The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry. Objectives 1.01, 1.05, 1.08, 1.09, 1.10 Goal 4: The learner will conduct investigations and utilize technology and information systems to build an understanding of chemistry. Objectives 4.02, 4.04, 4.05, 4.06, 2.02, 2.03  ENGAGE: Putting Together AND Breaking Down Part 1: Give students a set of numbers, 0-9. Tell students that they will be given 2 minutes and they should put combinations of numbers together. Next give the students the letters A-Z. Tell the students that they will be given 2 minutes to form combinations with the letters. Next, tell the students that they should use both numbers and letters to form combinations. Give the students 2 minutes to complete these combinations. Tell students that this is all the directions that they will get. Ask the students to share some of their combinations. This will lead into the discussion of how elements can combine in various ways to make compounds and how elements and compounds can combine to form mixtures. After the activity, ask questions such as: What numbers did you choose to form your compounds? Why? What letters did you choose to form your compounds? Why? How many numbers did you choose to include in your compounds? Why? How many letters did you choose to include in your compounds? Why? Did you repeat any of these numbers or letters? Why? What types of things are created by combining numbers? Letters? Letters and numbers? How does the combination of letters only or numbers represent the formation of a compound? How does the combination of numbers and letters represent a mixture? Part 2: Breaking Down a Compound: Water Have the students complete the activity as directed in the handout Breaking Down a Compound: Water to break down water into hydrogen and oxygen. Use the probing questions for whole class discussion after the activity. Ask the students to make a KWL chart about compounds and mixtures. Have the students share some of the things they know about compounds and mixtures. Write these things on a large piece of chart paper. Then ask the students to share some of the things they want to know about compounds and write their ideas on the chart paper. Tell the students that you will post the paper in the classroom to refer to it as you study compounds. Then students need to keep their KWL chart to add to as they complete the unit on compounds. Use the following questions as guides to completing the know section of the KWL chart: Why do elements form compounds? Can any 2 elements form compounds? Do the properties of a compound match the properties of the elements that combined to form the compound? Can the same 2 elements combine in different ratios to form 2 different compounds? How do elements and compounds form mixtures? What is the difference between a compound and a mixture? How do we know a chemical reaction has taken place? EXPLORE: Students will work in pairs to create a flyer, poster, or other technology to compare and contrast elemental reactants and their resulting compounds. Partners will research 2 elements and the resulting compound from the reaction between the two elements. A rubric is included for grading. Note to teacher: The following list gives possible element/compound sets for this activity. It incorporates the same element to produce different compounds to reinforce the concept that elements combine in a multitude of ways to form compounds. See the list of additional resources for possible websites for the elements. The flyer or poster needs to include the following information about each element and the compound: Physical properties/changes: Melting point Boiling point Appearance Density Solubility Classification Chemical properties/changes: Reactivity Toxicity Element/compound sets might include: sodium and chlorine to form salt (sodium chloride) carbon and oxygen to form carbon dioxide carbon and oxygen to form carbon monoxide hydrogen and oxygen to form water hydrogen and oxygen to form hydrogen peroxide hydrogen and chlorine to form hydrochloric acid calcium and chlorine to form calcium chloride iron and oxygen to form rust(iron III oxide) zinc and sulfur to form zinc sulfide calcium and bromine to form calcium bromide silver and chlorine to form silver chloride lithium and bromine to form lithium bromide carbon and hydrogen to form propane carbon and hydrogen to form methane carbon and hydrogen to for gasoline (octane) EXPLAIN: Use the PowerPoint HYPERLINK "Final Version of PowerPoints\\Compounds,_mixtures,_and_reactions_revised_5-30.ppt"Compounds, Mixtures, and Reactions to explain how the periodic table is organized. Ask the student to complete the handout of notes as you present the PowerPoint. (If you do not have access to a projector, you can print out a class set of handouts from the PowerPoint for students to look at as you discuss.) Make sure to talk about compounds (synthetic and natural), mixtures, and reactions in their everyday lives. Give some examples of each. Use the Pure Substances versus Mixtures handout to help students differentiate between compounds and mixtures. ELABORATE: The following activity is adapted from Countertop Chemistry from Science House. Two reactions will be performed in a freezer gallon sized Ziploc"! bag so that they can be easily observed and to minimize the mess. The students will also explore the conservation of mass when measuring the mass before and after the reactions. The concepts of endothermic and exothermic reactions are also addressed. Teacher's Notes: The gas that is produced is carbon dioxide, CO2. It is formed from the carbonate ion, HCO3 -. A burning splint would show that the gas extinguishes the flame. Some fire extinguishers use carbon dioxide for this reason. Safety precautions: As the Ziploc bags expand, care should be used to prevent excessive pressure build-up. The bags may burst. Caution students not to increase the quantities of the chemicals. Disposal: Solid wastes may be placed in a solid-waste container. All solutions may be poured down the drain, followed by water. When calcium chloride is dissolved in water, heat is given off. Handle these solutions with care. OPTIONAL ACTIVITY: Set up the following stations for students to work with chemical reactions. Copy and print the station directions for the students. Note to Teacher: *Control for stations 1-3: Measure and pour 40 mL of Hydrogen Peroxide into a cup and measure the initial temperature. Station # 1: Have students mix 40 ml of hydrogen peroxide in a cup. Find and record the initial temperature of the hydrogen peroxide. Add one spoonful of activated yeast to the cup and stir. Find and record the temperature after adding the activated yeast. Observe for 3 minutes, record any observations, and take a final temperature reading. Station # 2. Mix 40 ml of hydrogen peroxide in a cup. Find and record the initial temperature of the hydrogen peroxide. Add one spoonful of sugar to the cup and stir. Find and record the temperature after adding the sugar. Observe for 3 minutes, record any observations, and take a final temperature reading. Station # 3: Mix 40 ml of water in a cup. Find and record the initial temperature of the water. Add the contents of a pixie stick and 1 spoonful of baking soda to the cup and stir. Find and record the temperature after adding the pixie stick and baking soda. Observe for 3 minutes, record any observations, and take a final temperature reading. Station # 4: Mix 40 ml of vinegar in a cup. Find and record the initial temperature of the vinegar. Add 1 spoonful of sugar to the cup and stir. Find and record the temperature after adding the sugar. Observe for 3 minutes, record any observations, and take a final temperature reading. Station # 5: Put lemon juice on a dirty penny. Allow the penny to sit for 3 minutes. Observe the penny and record any changes. Station # 6: Mix 10 ml of vinegar and 10 ml of milk. Allow the milk to sit for one minute. Observe and record any changes. Use the following probing questions to discuss the stations with the students: Do you think you have created a chemical reaction at each station? Why or why not? How are the temperature changes you observed in these investigations different than if you put something on the stove? If you pour hydrogen peroxide on a cut and a white substance appears, what do you know has taken place? Can you think of something in real life that uses a chemical reaction? What questions do you still have about chemical reactions? Ask the students to list the compounds they mixed in these stations. Then have them find out the chemical name for each compound. EVALUATE: Students will complete a worksheet with a series of scenarios in which the student must identify if a chemical reaction has occurred, if the substances are compounds or mixtures, and how mixtures can be separated as opposed to compounds. The following site is for a chemistry scavenger hunt. This would make a good culminating activity for this unit on matter:  HYPERLINK "http://sciencespot.net/Media/chemscavht.pdf" http://sciencespot.net/Media/chemscavht.pdf * Ask the students to write a summary of this unit for the KWL chart to show what they have learned. Additional Resources The following links are for compounds activities.  HYPERLINK "http://www.pbs.org/saf/1207/teaching/teaching3.htm" http://www.pbs.org/saf/1207/teaching/teaching3.htm  HYPERLINK "http://www.sciencenetlinks.com/lessons.cfm?DocID=150" http://www.sciencenetlinks.com/lessons.cfm?DocID=150 elaborate for the compounds unit  HYPERLINK "http://www.pslc.ws/mactest/index.htm" http://www.pslc.ws/mactest/index.htm  HYPERLINK "http://www.nationalgeographic.com/resources/ngo/education/plastics/index.html" http://www.nationalgeographic.com/resources/ngo/education/plastics/index.html ENGAGE, Part 5 Resource Make a copy of the following numbers and letters for each group. Cut apart and place a set of numbers in one bag/envelope and a set of letters in one bag/envelope. 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZAAAEEEIIIOOOUUUBCLMNRSTY ENGAGE, Part 5 Name ___________________________________ Handout Date ____________________________________ Breaking Down a Compound: Water Purpose: To break down water into hydrogen and oxygen. Materials: 2 Petri dishes 2 paper clips salt water 9-V batteries 2 alligator clips Procedure: Place a small amount of salt in a Petri dish and fill the Petri dish about full with water. Bend the paper clips so that one end of the paper clip is bent upwards. Place the paper clips in the salt-water solution in the Petri dish. Attach the alligator clips to the paper clips. Make sure the paper clips are NOT touching. Connect one paper clip (alligator clip) to the positive post of the battery and the other paper clip (alligator clip) to the negative post of the battery. Probing Questions: What do you see occurring? What compounds are in the Petri dishes? What is the role of the salt? Would the reaction occur without salt? What are the bubbles that you see forming on the paper clips? Which end is the anode? Which end is the cathode? Is electrolysis a chemical or physical means of separation? ENGAGE, Part 5 Name ___________________________ Handout Date _______________________________ KWL Chart We are studying . Compounds, Mixtures, and Reactions! What I KNOW about compounds, mixtures, and reactions: What I WANT to know about compounds, mixtures, and reactions:What I LEARNED about compounds, mixtures, and reactions:1. Why do elements form compounds? 2. Can any two elements form compounds? 3. Do the properties of a compound match the properties of the elements that combined to form the compounds?4. Can the same two elements combine in different ratios to form 2 different compounds?5. How do elements and compounds form mixtures?  6. What is the difference between a compound and a mixture?7. How do we know a chemical reaction has taken place? EXPLORE, Part 5 Name ___________________________________ Handout Date ____________________________________ Elements and Compounds Create a flyer or poster to illustrate the relationship between elements and the compounds they form. Choose one of the following element/compound sets: sodium and chlorine to form salt (sodium chloride) carbon and oxygen to form carbon dioxide carbon and oxygen to form carbon monoxide hydrogen and oxygen to form water hydrogen and oxygen to form hydrogen peroxide hydrogen and chlorine to form hydrochloric acid calcium and chlorine to form calcium chloride iron and oxygen to form rust(iron III oxide) zinc and sulfur to form zinc sulfide calcium and bromine to form calcium bromide silver and chlorine to form silver chloride lithium and bromine to form lithium bromide carbon and hydrogen to form propane carbon and hydrogen to form methane carbon and hydrogen to for gasoline (octane) You will include the following information in your flyer or poster: Physical properties/changes: melting point boiling point appearance density solubility classification Chemical properties/changes: reactivity toxicity EXPLORE, Part 5 Name___________________________ Rubric Date ____________________________ Rubric: Elements vs Compounds Flyer or PosterCategory43210Physical properties of the elements The physical properties of the elements have been thoroughly developed. All the appropriate properties have been included.The physical properties have been sufficiently developed with reasonable relevancy.The physical properties are partially developed with some relevancy.The physical properties has major flaws and limited or no relevancy. No attempt has been made.Physical properties of the compoundThe physical properties of the compound have been thoroughly developed. All the appropriate properties have been included.The physical properties have been sufficiently developed with reasonable relevancy.The physical properties are partially developed with some relevancy.The physical properties has major flaws and limited or no relevancy. No attempt has been made.Chemical properties of the elementsThe chemical properties of the elements have been thoroughly developed. All the appropriate properties have been included.The chemical properties have been sufficiently developed with reasonable relevancy.The chemical properties are partially developed with some relevancy.The chemical properties has major flaws and limited or no relevancy. No attempt has been made.Chemical properties of the compoundsThe chemical properties of the compounds have been thoroughly developed. All the appropriate properties have been included.The chemical properties have been sufficiently developed with reasonable relevancyThe chemical properties are partially developed with some relevancyThe physical properties has major flaws and limited or no relevancy No attempt has been made.Compare and contrast Students have compared the elemental properties to the compound properties.Students have compared the elemental properties to the compound properties.Students have compared the elemental properties to the compound properties partially developed with some relevancy.Students have compared the elemental properties to the compound properties partially with major flaws and limited or no relevancy.No attempt has been made. Explain, Part 5 Name:________________ Handout Date:_________________ Compounds, Mixtures, and Chemical Reactions See flow chart What is a pure substance? A pure substance is a classification of matter that includes both _______________ and ______________. Pure substances ____________ be separated by physical means such as distillation, filtration, or chromatography. Elements We have already studied elements: Remember an element is made of one kind of ___________. Found on the _____________ _____________ What is a compound? A compound is a pure substance that is created by ______ or _______ elements ____________ reacting and joining together. Examples: NaCl, H2O, CO2, _______, NaHCO3, and ___________ Notice that elements combine in many ways to make compounds. Examples: H2O, ________, CO and _________ Why do compounds form? Compounds form to allow elements to become more _____________. ____________ is flammable when it comes in contact with H2O and __________ is a toxic gas _________ is a very stable compound that is neither flammable nor toxic (in normal quantities) Compounds that are extremely unstable will break down to form the more stable _________________. How do compounds form? Compounds form by the interaction of the ___________ and valence _____________ of 2 or more elements. The ___________ Rule: an element is most stable with ________ valence electrons Elements will join ____________ to get _____ valence electrons Ex: CO2 oxygen has ____ valence electrons and carbon has ____ If carbon shares _____ with each oxygen everyone will have _____ valence electrons! What do compounds have to do with my life? Compounds are ______________ that make up _______ living and non-living things. Examples: Where would you be without: _______--water _______--table salt _______--rubbing alcohol _______--an example of an unsaturated fat What is a mixture? A mixture is the _____________ combining of 2 or more substances It is important to understand that a mixture is not ____________ combined Mixtures can be separated by physical means such as _____________, filtration, and ___________________ Mixtures can be divided into two groups: ______________ mixtures ______________ mixtures How do mixtures form? Mixtures form by physically _____________ 2 or more substances together Remember _______ chemical change is occurring The formation of a mixture is not a result of ____________ energy What is a homogenous mixture? A homogenous mixture is a mixture that is __________ distributed Homogenous mixtures are commonly called ______________. Solution = ___________ + _____________ Solute: stuff ________ dissolved Solvent: Stuff __________ the dissolving The ___________ is present in greater quantity The ___________ is present in lesser quantity Ex: Salt water: Salt = __________, Water=____________ What is a heterogenous mixture? A heterogenous mixture is a mixture that is __________ distributed Examples: Iced tea: the ice is found floating at the top and therefore is not evenly distributed throughout the tea Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore the mixture is unevenly distributed. How are mixtures important to my life? We encounter mixtures everywhere in our lives Where would you be without: Ice cream ______________ Shampoo Soup ______________ Orange Juice How can we change matter into new substances? Chemical reaction (also known as a __________ __________): a change in a substance or substances that results in a totally ________ substance Ex: 2H2(g) + O2(g) ( _________ Notice that the ___________ (the substances you start with) combine to form a new substance (the _____________) How do I know if a chemical reaction has occurred? There are 5 indicators of a chemical reaction evolution of a ___________ evolution of _____________ evolution of _____________ __________ change evolution of a ____________ Precipitate: an ____________ substance that is produced as a result of a chemical reaction XV: Why do chemical reactions occur? Chemical reactions occur to produce a more _________ product than the existing reactants Ex: 2Na(s) + Cl2(g) ( 2NaCl(s) *The sodium is highly unstable and the chlorine gas is somewhat unstable. The resulting sodium chloride is _______ stable. **It is important to understand that the products have totally different properties than the reactants Where does the matter go? It is important to understand that when matter undergoes a chemical reaction (ie a chemical change) it does not disappear or appear The atoms are _____________ and form __________ bonds but no matter is lost or gained. This is called the Law of ________________ of Matter What kind of chemical reactions do I experience? The _________ milk and _______ baking soda that produce CO2 gas when a cake bakes Paper _________ to produce ashes, CO2, and H2O vapor Hydrogen peroxide ____________ to produce water and oxygen gas  SHAPE \* MERGEFORMAT   Explain, Part 5 Name:________________ Handout Date:_________________ SubstancePure SubstanceMixtureRocky Road ice creamIronRubbing alcoholCarbon dioxidePure waterAirGoldMilkSugar waterCarbonHydrogenCarbonated drinkChex mix Baking sodaHeliumOcean water Elaborate, Part 5 Name:________________ Handout Date:_________________ Indicators of Chemical Reactions and the Law of Conservation of Mass Materials 2 ziptop bags calcium chloride (or dry heat) baking soda white vinegar tablespoon 35 mm film canister (or paper cup) balance thermometer tape Procedure Add 2 Tbsp. (30 mL) baking soda to a Ziploc"! bag. Gently place a film canister (with 30mL of vinegar) inside the bag in the upright position. Squeeze out any excess air. Place the thermometer in the bag and seal the bag over to the thermometer. Tape the bag around the thermometer to seal the area. Take the initial temperature of the vinegar solution being careful not to spill the vinegar. Record the temperature in the data table under initial temperature. Take the mass of the bag and its contents (be careful not to spill the vinegar) using a balance. Record the mass in the data table under initial mass. Record initial observations about the contents of the bag in the column marked observations. Spill the vinegar into the bag by shaking. Take the temperature of the resulting substance. Record this temperature under the final temperature column. Mass the bag and its contents using a balance. Record this mass under the final mass column. Record any observations after the reaction in the final observations column. Repeat this steps 1-10 using 1 Tbsp. of calcium chloride instead of baking soda and 30 mL of vinegar. Data and Observations: BagInitial Temp (oC)Initial Mass (g)Initial ObservationsFinal Temp (oC)Final Mass (g)Final ObservationsBaking soda and vinegarCalcium chloride and vinegar Questions: Give possible indicators that helped you understand that a chemical reaction has occurred. Discuss the similarities and differences between reaction 1 and reaction 2. What happened to the temperature in the bag with baking soda and vinegar? What happened to the temperature in the bag with the calcium chloride and vinegar? Which reaction was endothermic? Exothermic? Justify your answers. What gas is being produced? How could you test this? Evaluate, Part 5 Name _____________________________ Handout Date ______________________________ Compounds, Mixtures, and ReactionsWhat Have You Learned? A student has a small amount of salt and sand. He mixes the solids with water. He then needs to separate them back out. What constitutes the homogenous mixture in this situation? What constitutes the heterogeneous mixture in this situation? How would the student separate the sand and water? What is left after the student removes the sand? How could the student recover the salt? A student mixes baking soda and vinegar. The student knows that baking soda would dissolve in water (vinegar is mostly water). The student wants to know if he has created a mixture or if he has performed a chemical reaction. Discuss what observations the student might make once he mixes the two substances. Has the student created a mixture or has he performed a chemical reaction? Justify your answer. A student is given a sample of pure water, a sample of salt water, and a sample of muddy water. Which sample(s) is classified as a compound? How do you know? Which sample(s) are classified as mixtures? How do you know? Classify the mixture(s) as heterogeneous or homogenous. Justify your answer. A student performs a chemical reaction. She first obtains the mass of the reactants before mixing them. She notices bubbles result when the reactants are mixed. She then obtains the mass after the reaction has occurred. Will the mass before the reaction be the same after the reaction? If not, how do we account for the missing mass? What law governs this need to account for the missing mass? A student mixes the same solid with three different liquids. When the solid is mixed with liquid 1, the resulting system becomes very cold. When the solid is mixed with liquid 2, no temperature change is detected. When the solid is mixed with liquid 3, the resulting system is very hot. Which scenarios gave an indication of a chemical reaction? Justify your answer. Which scenario showed an endothermic reaction? Justify your answer. Which scenario showed an exothermic reaction? Justify your answer. Terms Used in Part 5 Synthetic: Compound: a pure substance that is created by 2 or more elements chemically reacting and joining together. Mixture: The physical combination of 2 or more substances; can be separated by physical means. Homogeneous mixture: A mixture that is evenly mixed; also called a solution. Heterogeneous mixture: A mixture that is unevenly mixed. Precipitate: an insoluble substance that is produced as result of a chemical reaction. Endothermic reaction: A chemical reaction in which heat energy is absorbed. Exothermic reaction: A chemical reaction in which heat energy is given off. Law of Conservation of Mass: A law that states that matter cannot be created or destroyed during a chemical reaction. The mass of the reactants is equal to the mass of the reactants. Unit 2 Name ___________________________________ Date ____________________________________ Unit 2: Multiple Choice Questions Which of the following is an example of a chemical change? water boiling ice melting breaking glass paper burning Which element is a metalloid? sodium arsenic neon cobalt An example of a property of matter that can be observed without changing the identity of the matter is flammability reactivity solubility toxicity Use your periodic table to locate the element in Group 18, Period 3. Answer questions 4 and 5 about this element. What is the state of matter for this element? solid liquid gas plasma This element is a halogen noble gas alkali metal transition metal Sodium and chlorine can react chemically to form table salt. How does the mass of the table salt formed in this reaction compare to the mass of the sodium and chlorine before the reaction takes place? The mass of the table salt formed is less than the sodium and chlorine. The mass of the table salt formed is greater than the sodium and chlorine. The mass of the table salt formed is twice the mass of the sodium and chlorine. The mass of the table salt formed is the same as the mass of the sodium and chlorine. What does the law of conservation of mass mean during a chemical reaction? The total mass of the reactants is greater than the total mass of the products. The total mass of the reactants is the same as the total mass of the products. The total mass of the reactants is less than the total mass of the products. The total mass of the reactants and products cannot be measured. Use the information in the following box from the periodic table to answer questions 8-9.  This element is classified as a Metal Nonmetal Metalloid Actinide This element has ___ protons. 5 11 22 23 H2O and H2O2 are compounds that are both formed by bonding hydrogen and oxygen. These compounds demonstrate that the second oxygen in hydrogen peroxide was accidently bonded. that elements bond in a multitude of ways to make compounds. that elements combine in random ways. that water has gained an extra oxygen in a secondary reaction. Solid sodium is reacted with chlorine gas and a crystalline solid(sodium chloride) was formed. The crystalline solid is evidence that the sodium was broken down into tiny pieces by the chlorine. the reaction caused impurities to fall out. elements bond in a multitude of ways to make compounds. the chlorine solidified. A substance has a mass of 25.6 g and a volume of 31.6 mL. Use the information in the chart below to answer questions 10-11. SubstanceDensity (g/mL)Mercury13.6Silver10.5Aluminum2.7Water1.0Ethanol0.81  What is the identity of the substance? mercury aluminum water ethanol If the substances were placed in water, which substance would float on the water? mercury silver aluminum ethanol What characteristic property is shared by all matter? mass flammability corrosiveness toxicity Which of the following statements is true about all natural elements? They are all metals. They all exist in nature. They can all be found in the soil. They are all made by humans. Which of the following substances is synthetic? paper gold sodium uranium When baking soda and vinegar are mixed, what evidence suggests a chemical change has occurred? the baking soda dissolves in the vinegar. the pH changes. evolution of a gas. light is given off. A science teacher mixes calcium chloride and vinegar in a test tube. He passes the test tube around for his students to feel. The students notice that the test tube is hot. The science teacher asks the students to decide if the mixing of the two chemicals involved a physical or chemical change. He also asks the students to justify their answers. Which student gave the correct answer? Student 1: the change was physical because a temperature change occurred. Student 2: the change was chemical because a temperature change occurred. Student 3: the change was physical because the two chemicals mixed. Student 4: the change was chemical because the two chemicals mixed. Answers: d b c c b d b a b b c d d a b a c b     8th Grade Unit 2  PAGE 20 PAGE  8th Grade Unit 2  PAGE 153 PAGE  PAGE  PAGE  Language (ELD) Objective. The learner will: - discuss the physical properties of mass and volume. - write definitions for matter and physical properties. - read and follow instructions for conducting a lab. - write a summary about information gathered on mass and physical properties. Key: Element Families  Alkali metals  Alkaline earth metals  Transition metals  Boron family  Carbon family  Nitrogen family  Oxygen family  Halogens  Noble gases  Lanthanides  Actinides Use the Periodic Table in your textbook or other resource to shade the boxes in the blank table of elements. (See colors on the board.) Color the key below. Sample Mass10.23 gVolume of Water20.0 mLVolume of Water and Sample21.5 mL What is the density of the object that the student analyzed? For LEP students, use visuals to aid students with making a list of matter and non-matter things. Additionally, have them write a definition for matter (see example at end of unit) and post. Element Name= _______________________ Symbol = _____ Atomic Number = _______ p = _____ Atomic Mass = _________ n = _____ Mass Number = ________ e- = _____ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________ __________________________________________________________________ Station #9 Steel Wool Observe the steel wool in water. What is the brown substance? Are you observing a physical or chemical change? Station #8 Bread v/s Concrete Look first at the bread and ingredients it is made from. Compare the product, the bread, with its ingredients, the flour, eggs, and other things you see. Can you see the egg in the bread? Is the bread a mixture of its ingredients that you could separate out so that you still had eggs, flour, and the others? Is making bread a physical or chemical change? Write down your observations. Now look at the concrete and its ingredients. Can you see the ingredients mixed in the parts of the concrete, as in a physical change, or has a new substance resulted, indicating a chemical change? Write your observations. Station #7 Effervescing Tablets Fill the small container about two-thirds full of water from the container marked "Fresh." Drop in one of the tablets and observe what happens. Write your observations. Could you reverse this process? Even if you did so, could you remake the tablet? If a reaction is not reversible, it is probably a chemical change. Is this a physical or chemical change? Explain your reasoning. Station #5 Observing Magnetism Use the magnet to move the iron filings around. Hold the magnet about two inches about the filings. What happens? Is this a physical or chemical change? Station #6 Tarnished Pennies Take a tarnished penny and place five drops of lemon juice on it. After a few minutes, rub it gently with a paper towel. What happened? Is it a physical or chemical change? Can you reverse the process? Station #4 sugar and Salt Mix one teaspoon each of sugar and salt on the piece of paper or in the dish. Stir them gently together so that they are thoroughly mixed. Is this a physical or chemical change? Write your observations and predictions as to what kind of change it is. Write out a method you could use to test to see if this was a physical or chemical change. Take out the magnifying glass and examine some of your mixture. Compare the crystals you see with some from the original stock of salt and sugar. Write your observations and what kind of change you think this is. Station #3 Dissolving Sugar Fill the small container about one-half full of water and put one teaspoon of sugar in it. Stir until most or all the sugar is dissolved. Is this a physical or chemical change? Write your observations and the type of change it is. Station #2 Blowing up a Balloon 1 - 2 balloons for each student group; balloons should be fairly pliable so that the students can blow them up easily. Take a balloon and blow it up about half way. Is this a physical or chemical change? Ask yourself, Is the balloon the same substance as it was before, or has it become something else? Write down your answer. Fill the balloon until it is filled with air, but not tight, and tie it off. Grab the balloon with your hand and squeeze it into a new shape. Is this a physical or chemical change? Write your answer. Station #1 Melting Ice Observe the ice in the cup and record. Describe the ice. Is the ice changing? How? What is the ice changing into? Compare the color of the liquid in the cup to the color of the solid ice. Are you observing a physical or chemical change? Language (ELD) Objective: -The learner will orally explain the processes for investigating the physical and chemical properties of an unknown substance. -Complete a graphic organizer to compare and contrast the physical and chemical properties of a substance. -Write a paragraph to explain the importance of identifying properties in substances. LEP students should copy the ideas from the board and ask for clarification of terms as needed. Key: Kinds of Elements  Metals  Nonmetals  Metalloids Make sure to read through the directions carefully with LEP students and , to ensure that they have understood, ask students to repeat back to you in their own words what they need to do. Give LEP students the following paragraph outline to help them with writing a paragraph: It is important to know the properties of a substance because..(give 2 or 3 reasons) If you know what a substance is,.. If you do not know what is substance is, .. Give LEP students an example outline of what sections and the format of the pamphlet. Use if desired. Language (ELD) Objective: The learner will: - Make predictions through oral discussion. - Read information on the structure of an atom and the development of its model over time. Students will demonstrate their understanding using a timeline. - Listen for specific information and follow verbal directions. - Write a summary of concepts studied during the unit part. 11 NA Sodium 22.9898 LEP students should use the summary prompts from previous unit parts to write their summaries. Provide a written definition for the meaning of valence electrons and the octet rule for LEP students to copy into their notes. Print these definitions and post in the classroom. Provide examples of each element family for LEP using pictures, actually samples of the elements etc. Allow LEP students to make notes to remind them/help them identify element family Provide the following summary prompt for LEP students: In this chapter, we have studied about.. We have learned that. We have also learned that The most important information I need to remember from this chapter is Language (ELD) Objective: The learner will - Orally discuss the structure of a calendar and discover how it relates to the periodic table. - Recognize and describe the different elements on the periodic table through oral discussion. - Read and write using adaptations of concepts from the unit part to create a superhero or villain. Use the Periodic Table in your textbook or other resource to shade the boxes in the blank table of elements (orange for metals, pink for nonmetals, and green for metalloids). Color the key below. Key: State of Matter Solid Liquid Gas Use the Periodic Table in your textbook or other resource to shade the boxes in the blank table of elements (red for solids, blue for liquids, and yellow for gases). Color the key below. Topic: How do you identify a mystery powder? If LEP students choose this option, show and explain a sample resume that contains examples of the information they need to include in their scientists resume. Language (ELD) Objective: The learner will - Discuss how elements can be combined to make compounds - Say and correctly pronounce the name of elements - Read and follow directions for conducting a lab activity - Write a summary of the concepts learned in this unit part ____________ oxygen - hydrogen + hydrogen + A demonstration of retention factors is highly recommended for making the concept of retention factors more comprehensible for LEP students. Additionally, provide LEP students with a Summary of Notes sheet (see end of unit part) with the definitions of properties, polarity, heat, density, mass, volume, solubility, retention factors etc to read over and check that they have clearly understood these concepts from this unit part. Allow LEP students to use this note sheet during evaluations. Give LEPs a KWL chart template. The example chart provided at the end of the unit part has prompts at the beginning of each column to assist students with knowing what information to include in each column. Allow students to work in pairs and then to share their ideas in groups. Talk through directions for the labs with LEP students and model the steps they must follow to conduct the lab. Ensure they understand the concepts of DENSITY, HEAT & SOLUBILITY. Print the definition handouts (see end of unit part) on cardstock and allow LEPs to use these definitions as they conduct the lab. Post these definitions at the end of the labs for the whole class. Check LEP students understanding of the concepts of physical and chemical change using the vocabulary transparencies at the end of Part 2. They can be printed and posted. Introduce the definition card for polarity to LEP students. They can add this card to the collection of other definitions they have used during this unit so far. Post the definition for whole class at end of the unit. For LEP students, provide a skeleton summary paragraph for them to complete. For example: During our experiments, we____________. We observed that the mass of an object_____________ and that the volume of an object___________ D=0.5g/mL D=9.8g/mL D=5.9g/mL D=2.3 g/mL Blocks A, B, C, D were placed in water (D=1.0 g/mL). One of the blocks floated while the other sank. Which block floated? Justify your answer. D C B A Station 1: Oobleck Materials: Oobleck, spoon, wax paper, paper towel Procedure: Spoon a small amount of Oobleck onto a piece of waxed paper. Observe the Oobleck. Record on your chart. Clean up your area before moving to the next station. Carefully ball up the waxed paper and throw in the trash bucket. Clean the table. Station 2: Shaving Cream Materials: Shaving cream, wax paper, paper towel Procedure: Dispense a small amount of shaving cream onto the wax paper. Observe the shaving cream. Record on your chart. Clean up your area before moving to the next station. Carefully ball up the wax paper and throw in the trash bucket. Return the can of shaving cream to the container. Clean the table. Station 3: Granite and Brick Materials: Granite, brick, paper towel Procedure: Observe the brick. Observe the granite. Record your observations in your chart. Clean up your area before moving to the next station. Return the brick and the piece of granite to the container. Clean the table. Station 4: Cornflakes Materials: Cornflakes, Ziploc bag, balance, paper towel Procedure: Measure one cup of cornflakes into the Ziploc bag. Measure the mass of the Ziploc bag of cornflakes. Record in your data table. Carefully crumble the cornflakes in the bag. Measure the mass of the Ziploc bag of cornflakes. Record in your data table. Clean up your area before moving to the next station. Carefully empty the cornflakes in the trash bucket. Return the cornflakes and Ziploc bag to the container. Clean the table. Station 5: Marbles and Marshmallows Materials: Marbles, marshmallows, cup, balance, paper towel Procedure: Measure the mass of the cups. Fill one cup with marbles and one cup with marshmallows. Measure the mass of each filled container. Subtract the mass of the empty cup from the mass of the filled container to determine the mass of each substance. Record on your chart. Clean up your area before moving to the next station. Carefully pour the marbles and marshmallows back in their bags. Clean the table. Station 6: Water Materials: Water, beaker, paper towel Procedure: Observe the water. Record on your chart. Clean up your area before moving to the next station. Clean the table. Station 7: Balloon Materials: balloon, balance Procedure: Measure the mass of the balloon. Blow up the balloon. Measure the mass of the inflated balloon. Record your observations in your chart. Clean up your area before moving to the next station. Carefully cut the tied end of the balloon and release the air quietly. Throw the balloon in the trash bucket. Clean the table. Solid Samples Sample 1Sample 2Sample 3Mass0.50 g2.81 g3.54 gVolume0.29 mL0.36 mL1.31 mL Densities of Known Substances SubstanceDensity (g/mL)Aluminum2.702Copper8.92Zinc7.14Gold19.31Iron7.86Lead11.34Magnesium1.74 __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________ __________________________________________________________________ ____________ The 4th ring and up hold _____. ____________________________________ The 3rd ring holds _____. The 1st ring holds ______. The 2nd ring holds _____. 6 p and 6 n live in the nucleus Station #1 Crystalline Structure Place a small amount of powder 1 in the Petri dish. Place the Petri dish under the microscope. In your data section, SKETCH the structure of the powder as you see it under the microscope. Repeat the process for each powder. Wipe the Petri dish out between each test. Station #2 Solubility Place a small amount of powder 1 in the Petri dish. Add 25 drops of water to the solid. Stir the mixture with a toothpick. Record your observations. Pay close attention to whether or not the powder dissolves in the water. Repeat the process for the rest of the powders. Station #3 Color and Texture Place a small amount of each powder in a well in the well plate. DO NOT MIX THE POWDERS TOGETHER. Waft (wave the odor towards your nose with your hand) each powder. Record your observations in the data section. Note the texture of each powder. Record this observation in the data section. Station #4 pH Place a small amount of each powder in a well in the well plate. DO NOT MIX THE POWDERS. Add 10-15 drops of water to each powder. Touch the tip of a piece of red litmus paper to each mixture. Use a different piece for each powder mixture. Record your observations in the data section. Repeat the process using blue litmus paper. Record your observations in the data section. Station #6 The Heat is On Make 6 aluminum foil trays. Place a small amount of each powder in its own dish. Set the foil dishes with the powders on the hot plate (turned on a medium heat setting). Allow the powders to heat for 5-10 minutes. Record your observations in the data section. Station #5 Liquid Tests Place a small amount of each powder in a Petri dish. DO NOT MIX THE POWDERSEACH POWDER SHOULD GET ITS OWN PETRI DISH. Add 5 drops of liquid 1 to the Petri dishes under liquid 1. Record your observations in the data section. Add 5 drops of liquid 2 to the Petri dishes under liquid 2. Record your observations in the data section. Add 5 drops of liquid 3 to the Petri dishes under liquid 3. 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