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# Quiz 3 Answers 2-15-08 - Quiz 3 Write Down these Formulas G...

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Quiz 3, Feb 15, 2008 Write Down these Formulas Δ G = Δ H - T Δ S Δ G = Δ G o + RT lnQ E = E o – (0.059/n) (log Q)

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Cd 2+ + 2 e - Cd (s) E 1/2 o = -0.40 V VO 2 + + 2H + + e - VO 2+ + H 2 O E 1/2 o = 1.00 V 1.What is the oxidizing agent for the spontaneous reaction that occurs when this is used as a voltaic cell? A.Cd 2+ B.Cd (s) C.VO 2+ D.VO 2 + (Answer) E.H +
Cd 2+ + 2 e - Cd (s) E 1/2 o = -0.40 V VO 2 + + 2H + + e - VO 2+ + H 2 O E 1/2 o = 1.00 V A. +0.60 V B. +1.40 V (Answer) C. -1.40 V D. -0.60 V E. +2.40 V 2.What is the value of the standard cell potential for the voltaic cell?

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Cd 2+ + 2 e - Cd (s) E 1/2 o = -0.40 V VO 2 + + 2H + + e - VO 2+ + H 2 O E 1/2 o = 1.00 V 3.If the concentration of Cd 2+ is reduced from 1.0 M to 0.01 M in the Cd half cell, and all other concentrations remain at their standard values, what happens to the potential of the cell? A.The cell potential increases (Answer) B.The cell potential decreases C.The cell potential remains the same D.The cell potential becomes zero

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