04 Notes - Voltaic Cells

04 Notes - Voltaic Cells - Aim: How do voltaic cells work?...

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Aim: How do voltaic cells work? QQ: Mg 2+ + 2 Li 2 Li + + Mg 1) Provide the redox half reactions. 2) Explain why this reaction is spontaneous Do Now: What are the benefits and drawbacks of batteries? Voltaic Cells: utilize spontaneous redox reactions to produce electrical energy Anode: the electrode where oxidation takes place, this is the negative (-) terminal on a battery Cathode: the electrode where reduction takes place, this is the positive (+) terminal on a battery Salt Bridge: provides a medium for the ions to travel back and forth. Electrons always flow a way from the a node and move c loser to the c athode! Calculating Voltage The amount of energy produced by the cell (the voltage) depends on the materials present… Calculate the voltage for the following reaction: Zn(s) + Cu 2+ Zn 2+ + Cu(s) 1. Write the 2 half reactions: Oxidation: Zn (s) Zn 2+ + 2e- Reduction: Cu 2+ +2e- Cu (s) 2. Look up the standard electrode potentials in the table (see http://www.abcte.org/node/1018
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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04 Notes - Voltaic Cells - Aim: How do voltaic cells work?...

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