chem quiz 1 answers

chem quiz 1 answers - Chem 6C Hoeger C02 Quiz#1(total of 40...

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Chem 6C Name: SOLUTIONS Hoeger C02 Quiz #1 (total of 40 points) SOLUTIONS ARE IN RED: 1. Given the following half-reactions: i. Cu 2+ (aq) + 2e - barb2right Cu (s) E˚ = + 0.34 V ii. Fe 2+ (aq) + 2e - barb2right Fe (s) E˚ = - 0.44 V iii. Hg 2 2+ (aq) + 2e - barb2right 2 Hg (l) E˚ = + 0.79 V iv. Co 3+ (aq) + e - barb2right Co 2+ (aq) E˚ = + 1.81 V a. (6) Write the overall reaction of the couple that makes the best battery. What is the cell of this battery? Fe (s) barb2right Fe 2+ (aq) + 2e - E ˚ = +0.44 V 2Co 3+ (aq) + 2e - barb2right 2Co 2+ (aq) E ˚ = +1.81 V 2Co 3+ (aq) + Fe (s) barb2right 2Co 2+ (aq) + Fe 2+ (aq) E ˚ cell = +2.25V b. (6) Draw the cell diagram for this battery. Fe (s) |Fe 2+ (aq) ||Co 3+ (aq) , Co 2+ (aq) |Pt (s) c. (2) Which of the following has the strongest reducing power? (Circle the correct answer) Cu, Fe, Hg, Co 2+ 1. First recognize that the E˚ values are currently REDUCTION POTENTIALS . 2. Flip all of the half-reactions above, so that Cu, Fe, Hg and Co 2+ are in the reactants (makes sure you flip the sign of E˚, and now the E˚ values are OXIDATION POTENTIALS: oxidation = -(E˚ Reduction ) 3. Be careful of the trend! Highest E˚
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