Cellpotentialsand Cellpotentialsand Reductionpotentials
Answers 1 - 5 Answers
1. The difference is - indicating 25C and 1 M concentrations (1) 2. Voltages can be increased by arranging cells in series (1) (or changing concentrations) 3. A measure of the tendency of a given halfreaction to occur as a reduction (1) 4. The half-cell with the greater reduction potential will gain electrons (1) 5. The Cu half-cell has the greater reduction potential (1), since it is gaining electrons (1) /6
Answers 6 - 10
6. The Fe half-cell has the greater reduction potential (1) 7. Ecell = Ereduced - Eoxidized (1) (Ecell = standard reduction potential of substance reduced - standard reduction potential of substance oxidized) 8. 0.62 V (1) 9. There is no way to measure the standard reduction potential of an isolated half-cell (1) A reference/standard electrode is chosen (1) 10. Cu has the greatest reduction potential (1) /6
11. 0.00 V the is reduction potential for the hydrogen electrode (1) 0.00 V is arbitrarily set; its 0 by definition (1) 12. It has a lower reduction potential than the hydrogen electrode (1) 13. Either oxidation OR reduction can occur depending upon what the half-cell is coupled with (1) 14. Ecell = Ereduced - Eoxidized Ecell = EFe2+ EMg2+ 1.96 V = -0.41 V EMg2+ (1) EMg2+ = -0.41 V 1.96 V = -2.37 V /5
Answers 11 - 14
15. 5.92 V (1) by a F2 - Li cell (1) 16. a) 1.42 V - -0.25 V = 1.67 V (1) 1.67 b) 0.80 V - 0.34 V = 0.46 V (1) 0.46 c) -1.66 V - -2.37 V = 0.71 V (1) 0.71 d) 0.34 - - 0.44 V = 0.78 V or 0.78 0.77 V - 0.34 V = 0.43 V (1) 0.43 17. Yes (1) because the larger reduction potential will be reduced, the smaller will be oxidized (Ecell = Ereduced - Eoxidized) 18. Yes (1) because you are subtracting a smaller (or more negative) number from a larger number /8, /25
Answers 15 - 18
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