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Unformatted text preview: Version 429 Quiz 4 Laude (52390) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 5.0 points Consider the half reactions below: Br 2 + 2 e - 2 Br Fe 3+ + 3 e - Fe Co 3+ + e - Co 2+ Zn 2+ + 2 e - Zn E = +1 . 07 E =- . 04 E = +1 . 80 E =- . 76 Which species is the strongest oxidizing agent? 1. Br 2 2. Zn 3. Co 3+ correct 4. Fe Explanation: The right hand side of the half reaction with the highest standard reduction potential is the strongest oxidizing agent. In this case, that species is Co 3+ . 002 5.0 points In an electrolytic cell, the negative terminal is the (cathode/anode) and is the site of the (oxidation/reduction) half reaction. 1. cathode, reduction correct 2. anode, oxidation 3. cathode, oxidation 4. anode, reduction Explanation: In an electrolytic cell (analogous to charg- ing a battery) the cathode is always attributed a negative sign. By definition, the cathode isa negative sign....
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- Spring '09