CHM 2046 Chapter Notes - Chapter 19: Electrochemistry, Electromotive Force, Howlong

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16 Apr 2014
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** electrochemistry represents the interconversion of chemical energy and electrical energy. D g = d h td s if d s > 0, then td s < 0, and we can make a non spontaneous reaction spontaneous by raising the temperature so that td s term dominates. ** electrochemistry brings together, as a technique, several topics we have already studied: redox reactions, equilibrium, and thermodynamics. Thus, products have higher free energy than reactants, e. g. , metal plating. (surroundings do work on the system. ) Cell notation: cu (s) | cu2+ (aq) || ag+ (aq) | ag (s) ano d e c at h o d e s alt r id g e: vertical bars (|) indicate a phase boundary, electrodes placed at far left and right. In electrochemistry language, we talk about the cell potential (ecell) or electromotive force (emf), i. e. , the electrical potential difference (or voltage in everyday.

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