Chemistry 29 Wednesday, November 8, 2006

Chemistry 29 Wednesday, November 8, 2006 - Wednesday,...

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Wednesday, November 08, 2006 Chemistry REDOX REACTIONS How do you write balanced chemical equation for : o Electrochemical cells o Redox Reactions How do you calculate cell/reaction potentials? Text: Sections 11.5 GENERAL CONSIDERATIONS 1. Electrochemical cell a. Connect two half reactions i. Cu 2+ /Cu and Zn 2+ /Zn b. Have all 4 chemical species present i. (2 reactants, 2 products) 2. Redox Reaction a. Mix 2 reactants in one beaker i. Zn in HCl(aq) b. Have the 2 reactants i. Need to figure out the products 3. Use half-reactions from table 11.1 4. Calculating potentials a. E º rxn = E º red - E º ox b. E º cell = E º cathode - E º anode ELECTROCHEMICAL CELLS 1. We will write spontaneous in forward direction 2. e- spontaneous go to more + potential a. reduction 3. #e- gained = #e- lost 4. cell potentials ( E ºcell) should be + for spontaneous reactions Write the balanced equation, spontaneous in the forward direction, for the reaction that occurs when the following are connected:
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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Chemistry 29 Wednesday, November 8, 2006 - Wednesday,...

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