20080128 Chap12 Electrochem 1

20080128 Chap12 Electrochem 1 - Intro Chemistry II 030.102...

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Intro Chemistry II – 030.102 - Chapter 12 Spring, 2008 1 Chap. 12: Electrochemistry The relationship between the chemistry of oxidation-reduction reactions and the physics of charge flow. Electrochemistry deals with the inter- conversion of chemical and electrical energy: Chemical reactions can be a source of electrical energy. Electrical energy can drive nonspontaneous chemical reactions. Electrochemistry occurs through redox reactions (see Section 6.4). We seek to understand: The relationship between current and stoichiometry. Thermodynamics of electrochemical cells. Practical applications. 12.1. Electrochemical Cells Electrochemical reactions are carried out in electrochemical cells , that couple the redox reactions to external electrical circuits. Oxidizing reactant can be physically separate from reducing reactant, as long as they are connected through the external circuit. Galvanic cell: Reaction spontaneous, Gibbs free energy available to convert chemical energy to electrical energy. Electrolytic cell: Electrical energy taken from external circuit to drive a nonspontaneous chemical reaction. In both cases, magnitude and direction of current flow dictated by Gibbs free-energy change of oxidation-reduction reaction in the cell.
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Intro Chemistry II – 030.102 - Chapter 12 Spring, 2008 2 Spontaneous Chemical Reaction Reaction of copper with aqueous silver ions:
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This note was uploaded on 04/14/2008 for the course CHEMISTRY 102 taught by Professor Dagdigian during the Spring '08 term at Johns Hopkins.

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20080128 Chap12 Electrochem 1 - Intro Chemistry II 030.102...

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