F05L08_6 - I Chemical Equations description of chemical...

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1 I Chemical Equations – description of chemical reactions A. The Chemical Equation 1. stoichiometric coefficients – give the ration in which the reactants and products exist (no coefficient implies a value of 1) 2. numbers in formulas are subscripts and imply the ration of atoms in a molecule B. Balanced Chemical Equation – the same number of each atom appears on both sides of the equation 1. Examples a) a balanced equation b) a unbalanced equation 2. Balancing Chemical Equations: a) First balance atoms that occur only once on each side of the equation. b) Balance the reactant or product that occurs as a free element last. 3. Example 1: 4. Example 2: Note: a properly balanced chemical equation has integer coefficients only. 5. Do not introduce new molecules or change chemical formulas. 6. Pr. Ex. 3.1b BLB, p70 Balance the following equations by providing the missing coefficients: + AlCl 3 Al + HCl H 2 7. Similar Ex. 3.11 BLB Balance the following equations: Cr(OH) 3 (s) + HClO 4
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This note was uploaded on 03/12/2010 for the course CHEM 140 taught by Professor Ferrence during the Fall '08 term at Illinois State.

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F05L08_6 - I Chemical Equations description of chemical...

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