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Topic+5 - TOPIC 5 INORGANIC REDOX CHEMISTRY AND...

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T OPIC 5: I NORGANIC R EDOX C HEMISTRY AND E LECTROCHEMISTRY Spring 2010 1
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T OPIC 5 O BJECTIVES Discuss the fundamental processes of oxidation and reduction which drive electrochemical reactions. Outline the types of electrochemical cells with a discussion of the features of each cell with the inclusion of cell notation. Include a thorough overview of electrochemical calculations at standard and nonstandard states including calculations for galvanic and electrolytic cells. Provide an overview of the graphical representations of electrochemical processes. 2
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R EDOX R EACTIONS MnO 2 + 4 HBr MnBr 2 + Br 2 + 2 H 2 O 3 H 2 S + 2 NO 3 + 2 H + → 3 S + 2 NO + 4 H 2 O 3
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O BSERVED REDOX PROCESSES 4
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G ALVANIC CELLS OR V OLATAIC CELLS 5
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6
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I NERT ELECTRODES 7
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S TANDARD HYDROGEN ELECTRODE (SHE) 8
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M EASURING STANDARD POTENTIALS 9
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Half-Reaction (volts) Li + (aq) + e - = Li (s) -3.04 K + (aq) + e - = K (s) -2.92 Ca 2+ (aq) + 2e - = Ca (s) -2.76 Na + (aq) + e - = Na (s) -2.71 Mg 2+ (aq) + 2e - = Mg (s) -2.38 Al 3+ (aq) + 3e - = Al (s) -1.66 2 H 2 O (liq) + 2e - = H 2(g) + 2 OH - (aq) -0.83 Zn 2+ (aq) + 2e - = Zn (s) -0.76 Cr 3+ (aq) + 3e - = Cr (s) -0.74 Fe 2+ (aq) + 2e - = Fe (s) -0.41 Cd 2+ (aq) + 2e - = Cd (s) -0.40 Ni 2+ (aq)
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Topic+5 - TOPIC 5 INORGANIC REDOX CHEMISTRY AND...

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