Electrochemistry_III_Galvanic_Cells

Electrochemistry_III_Galvanic_Cells - ELECTROCHEMISTRY...

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Zn(s) + CuSO 4 (aq) ZnSO 4 (aq) + Cu(s) Blue Colorless Whitten This setup is like popping an inflated balloon—no useful work is done. It is possible to use Zn and Cu 2+ to do work (like balloon blowing blades of turbine). ELECTROCHEMISTRY ( GALVANIC OR VOLTAIC CELLS ) These are named for Allesandro Volta and Luigi Galvani, two Italian physicists of the 18th century. Galvanic Cell (Battery better and more efficient)
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Will this setup work? Immediate positive charge buildup negative charge buildup NO!
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Agar: A gelatinous material derived from algae and used as a thickener. SALT BRIDGE—Any medium through which ions can slowly pass. • It allows electrical contact between the two solutions. • It prevents mixing of the electrode solutions. • It maintains electrical neutrality in each half-cell as ions flow into and out of the salt bridge. 2 Half-Cells McQuarrie Electrodes ELECTROCHEMISTRY ( GALVANIC OR VOLTAIC CELLS ) Each half-cell has the metal and its ions present—both oxidation and reduction possible. Here Cu ions reduced because Zn is more active metal. But if other half-cell where Ag and it ions…
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Porous plug GALVANIC CELL ( DETAILS OF PROCESS ) Cu plates onto Cu electrode Zn electrode dissolves Zumdahl
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Porous plugs GALVANIC CELL Cathode Anode Reger a red cat + - Because e - are generated Because e - move towards + charge
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INTRODUCTORY DEFINITIONS In mechanical systems, force is the energy per unit of displacement F = w/ Δ d (from work = F Δ d) Similarly in electrical systems, voltage is the energy (E) per unit of charge (q) V = E/q (V = voltage) or pressure is the energy per unit of volume change. P = w/ Δ V ( V = volume) The voltage is also called the electromotive force or emf, E Units V = J/C The script E, E , is used to avoid confuse with the internal energy. WebCT and some books use E.
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This note was uploaded on 03/25/2011 for the course PHYSICS 121 taught by Professor Fayngold during the Spring '10 term at NJIT.

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Electrochemistry_III_Galvanic_Cells - ELECTROCHEMISTRY...

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