ࡱ> 7 bjbjUU p7|7|  lBBBB<&~||||555:&<&<&<&<&<&<&$' )`&5^555`&BB||[u&5LBR||:&5:&@[:!,"!| $J! !&0&T!Rg*ug*!BBBBWriting Chemical Formulas  HYPERLINK "http://www.howe.k12.ok.us/~jimaskew/ps/" \l "ans2"  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/quest.gif" \* MERGEFORMATINET What number is never used as a subscript in a chemical formula?  HYPERLINK "http://stats.bls.gov/oco/ocos079.htm" \t "_blank"  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/careers.jpg" \* MERGEFORMATINET  PharmacistChemical formulas represent compounds. Oxidation numbers are used to determine the ratio in which elements combine to form compounds. Oxidation numbers tell the number of electrons an atom gained or lost when forming the compound.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tridot.gif" \* MERGEFORMATINET The plus or minus indicates if electrons were lost or gained.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/asterix.gif" \* MERGEFORMATINET Since electrons have a negative charge, and atom with a negative oxidation number will gain electrons. That means an atom with a positive oxidation number will lose electrons.   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tip.gif" \* MERGEFORMATINET Nonmetals and polyatomic ions almost always gain electrons - have negative oxidation numbers. Metals almost always lose electrons - have positive oxidation numbers.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tridot.gif" \* MERGEFORMATINET The number indicates how many electrons. Example: Aluminum has an oxidation number of +3. It will lose 3 electrons when forming compounds. Oxygen has an oxidation number of -2. It will gain 2 electrons when forming compounds.  Common Oxidation Numbers ElementOxidation #ElementOxidation #ElementOxidation #Aluminum Al+3Bromine Br-1Calcium Ca+2Carbon C-4 or +4Chlorine Cl-1Chromium Cr+3Copper Cu+2 or +1Fluorine F-1Gold Au+3Helium He0Hydrogen H+1Iodine I-1Iron Fe+3 or +2Lead Pb+2Lithium Li+1Magnesium Mg+2Mercury Hg+2Neon Ne0Nickel Ni+2Nitrogen N-3Oxygen O-2Phosphorus P-3Potassium K+1Silicon Si+4Silver Ag+1Sodium Na+1Sulfur S-2Tin Sn+4 or +2Uranium U+6Zinc Zn+2  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tip.gif" \* MERGEFORMATINET Notice that some of the elements on the table have more than one possible oxidation number. You will soon learn how to know which one to use. However, the first listed on the table is the most common.  HYPERLINK "http://www.howe.k12.ok.us/~jimaskew/ps/preact.htm" \l "one" \t "_blank"  Understanding Chemical Formulas Chemical formulas are composed of a positive half and a negative half. Water is a compound you know to have a formula of H2O. The element with the positive oxidation number is always written first. H The element with the negative oxidation number is always written second. HO The total of the oxidation numbers in a compound must equal zero. Hydrogen's oxidation number is +1 and oxygen's is -2. With one H and one O, the total is not 0, it is -1. Subscripts, small numbers to the lower right of the chemical symbol, represent the number of atoms of that element present in the compound.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/asterix.gif" \* MERGEFORMATINET The subscript of 1 is never written in a chemical formula. It is understood since the chemical symbol is there.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/asterix.gif" \* MERGEFORMATINET Add subscripts after a chemical symbol, when needed, to make the oxidation numbers total zero. H2O Multiply subscript by oxidation number for the total oxidation number of each element in a formula. For hydrogen: (oxidation number +1) (subscript 2) = +2 total For oxygen: (oxidation number -2) (subscript 1) = -2 total The formula H2O is the correct formula.   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tip.gif" \* MERGEFORMATINET The easiest way to think of writing chemical formulas is to use the oxidation number (without the + or -) of one element as the subscript of the other element.  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/arrored3.gif" \* MERGEFORMATINET   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/forms.gif" \* MERGEFORMATINET   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/asterix.gif" \* MERGEFORMATINET Remember - subscripts of 1 are never written in a formula!   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/formstep.gif" \* MERGEFORMATINET Identify the oxidation number for the element making up each half (positive & negative) of the compound. Use the oxidation number (without the plus or minus) for each half as the subscript for the other half. Do not write a subscript of 1. Reduce the subscripts, if needed.   INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/tip.gif" \* MERGEFORMATINET After doing this, be sure the subscripts will not reduce. If both subscripts are divisible by the same number, they must be reduced to have the formula in its proper form. Example: Ca2O2 must be reduced to CaO  Practice Writing Chemical Formulas: Write the formulas for the compounds formed when these elements combine. Do not look at the answers before you have written all the formulas. If one of your formulas differs from the answer, try to find out why. If you have questions, ask your facilitator. hydrogen and oxygen sodium and chlorine chlorine and magnesium potassium and sulfur aluminum and oxygen gold and fluorine iodine and hydrogen phosphorus and silver phosphorus and aluminum sulfur and silver oxygen and uranium tin (IV) and oxygen iron (III) and oxygen copper (I) and chlorine copper (II) and chlorine  INCLUDEPICTURE "http://www.howe.k12.ok.us/~jimaskew/ps/asterix.gif" \* MERGEFORMATINET  Roman numerals indicate the oxidation number of the positive element in problems 12 - 15.  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