CW19-BRE - CHM 2046/Myers 2010 1. Class Worksheet 19...

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CHM 2046/Myers Class Worksheet 19 February 22, 2010 1. Oxidation Number = Oxidation State – Review (Text section 5.7) An atomic charge, sometimes fictional, calculated by assigning any shared electrons in a bond to the more electronegative element. The following are used to calculate this: Elements: O. N. = 0 (O 2 , N 2 , etc.) Monatomic ions: O. N. = actual charge (Na + , Mg +2 , Cl - , etc.) Usually: O = - 2, H = +1 Molecules and Polyatomic Ions: Sum of O. N. = Total Charge Examples : H 3 PO 4 ClO 4 - Cr 2 O 7 - 2 2. Oxidation-Reduction (Redox) Reactions. ( Rxns where there are O. N. changes.) Oxidation = an increase in O. N. Reduction = a decrease in O. N. Oxidizing Agent = Reducing Agent = Examples - Identify the OA and RA in these reactions: 2 SO 2 + O 2 2 SO 3 2 Na + Cl 2 2 NaCl 3. Balancing Equations for Redox Reactions. (Text section 21.1) Balancing equations that involve redox is tricky but, once you get the hang of it, is sort of fun! A few of these equations, particularly combustion reactions, you can
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This note was uploaded on 09/19/2011 for the course CHM 2051 taught by Professor Staff during the Spring '08 term at University of Florida.

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CW19-BRE - CHM 2046/Myers 2010 1. Class Worksheet 19...

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