CHEM 1360 CHS 8-9

CHEM 1360 CHS 8-9 - Oxidation-Reduction Reactions...

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Oxidation-Reduction Reactions Oxidation-Reduction Reactions OXIDATION = loss of electrons Examples: Na Na + + e - Al Al 3+ + 3e - S 2- S + 2e - OXIDATION = increasing the oxidation number (more positive) Example: NO NO 2 -2 +2 -2 +4 change = +2 +2 to +4 : N is oxidized LEO the lion goes GER Oxid. Nos:
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Oxidation-Reduction Reactions Oxidation-Reduction Reactions REDUCTION = gain of electrons Examples: N + 3e - N 3- Fe 3+ +e - Fe 2+ REDUCTION = decreasing the oxidation number (more negative) Example: MnO 4 - Mn 2+ Oxid. Nos: +7 +2 change = -5 +7 to +2 : Mn is reduced LEO the lion goes GER
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Voltaic Cells Voltaic Cells (a porous barrier can be used instead of salt bridge)
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Choose any two entries; the top one will act as the cathode and will be reduced; the bottom one will act as the anode and will be oxidized. This electromotive series presents data showing the tendency of substances to gain or lose electrons. The standard voltage will be the algebraic difference between the two respective potentials. 0.46 V
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Batteries Batteries are the most practical applications of voltaic cell. All batteries have self contained anode/cathode compartments. All operate using the same principles already discussed. The Classic “dry” (LeClanché) cell. carbon
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This note was uploaded on 04/12/2011 for the course CHEM 1420 taught by Professor Acree during the Spring '08 term at North Texas.

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CHEM 1360 CHS 8-9 - Oxidation-Reduction Reactions...

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