handout_L08_Electrochemistry

handout_L08_Electrochemistry - Electrochemistry...

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Electrochemistry Introduction • Reading: Zumdahl 4.10, 4.11, 11.1 • Outline – General Nomenclature – Balancing Redox Reactions (1/2 cell method) – Electrochemical Cells Nomenclature • “Redox” Chemistry: Reduction and Oxidation • Oxidation: Loss of electrons • Reduction: Gain of electrons (a reduction in oxidation number) LEO goes GER L oss of E lectrons is O xidation G ain of E lectrons is R eduction Redox Reaction Example • A redox reaction: Cu(s) + 2Ag + (aq) Cu 2+ (aq) + 2Ag(s) Ox. #: 0 +1 +2 0 oxidation reduction Redox Reaction Example (cont.) • We can envision breaking up the full redox reaction into two 1/2 reactions: Cu(s) + 2Ag + (aq) Cu 2+ (aq) + 2Ag(s) oxidation reduction Cu(s) Cu 2+ (aq) + 2e - Ag + (aq) + e - Ag(s) “half-reactions” Redox Reaction Example (cont.) • Note that the 1/2 reactions are combined to make a full reaction: Cu(s) + 2Ag + (aq) Cu 2+ (aq) + 2Ag(s) oxidation reduction • The important thing to remember: electrons are neither created or destroyed during a redox
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Winter '12 term at University of Washington.

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handout_L08_Electrochemistry - Electrochemistry...

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