11 - Elbel, Brittany – Homework 11 – Due: Apr 20 2006,...

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Unformatted text preview: Elbel, Brittany – Homework 11 – Due: Apr 20 2006, noon – Inst: J A Holcombe 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The standard potential of the Cu 2+ | Cu elec- trode is +0.34 V and the standard potential of the cell Pb(s) | Pb 2+ (aq) || Cu 2+ (aq) | Cu(s) is +0.47 V. What is the standard potential of the Pb 2+ | Pb electrode? 1. +0.13 V 2.- 0.81V 3. +0.81 V 4.- 0.26 V 5.- 0.13 V correct Explanation: 002 (part 1 of 1) 10 points Consider the following standard reduction po- tentials (V). Cu 2+ + 2 e- → Cu E = +0 . 337 V Sn 2+ + 2 e- → Sn E =- . 140 V Which of the following is the strongest reducing agent in these reversible half- reactions? 1. None of the species listed can act as a reducing agent. 2. Sn correct 3. Cu 2+ (1.0 M) 4. Sn 2+ (1.0 M) 5. Cu Explanation: 003 (part 1 of 1) 10 points Consider the half-reactions Cu 2+ + 2 e- → Cu E = 0 . 34 V Hg 2+ 2 + 2 e- → 2Hg E = 0 . 80 V Pd 2+ + 2 e- → Pd E = 0 . 99 V Au 3+ + 3 e- → Au E = 1 . 42 V Of the species listed the strongest reducing agent is 1. Pd 2. Au 3+ 3. Hg 2+ 2 4. Au 5. Cu correct Explanation: The reducing agents (the agents that lose electrons) are on the right hand side of the equation. As the E of the reduction half- cell reaction decreases, the strength of the reducing agent increases. 004 (part 1 of 1) 10 points Consider the reaction 2Ag + (aq) + Cu(s) → Cu 2+ (aq) + 2Ag(s) . If the standard potentials of Ag + and Cu 2+ are +0.80 V and +0.34 V, respectively, calcu- late the value of E ◦ for the given reaction....
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This note was uploaded on 06/23/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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11 - Elbel, Brittany – Homework 11 – Due: Apr 20 2006,...

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