Homework 9-problems - hernandez (ah29758) Homework 9...

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Unformatted text preview: hernandez (ah29758) Homework 9 sutcliffe (51045) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points In a galvanic cell, 1. electrolytes are added to carry electrons between electrodes. 2. oxidation takes place at the cathode. 3. electrical energy is used to reverse spon- taneous chemical reactions. 4. oxidation and reduction take place at the same time but at different electrodes. 002 10.0 points Zinc Copper 1 . 10 V V Voltmeter e e 1 M Zn 2+ (aq) 1 M Cu 2+ (aq) Salt bridge to carry ions In this electrochemical cell, what is the an- ode? 1. The solid zinc electrode 2. The solid copper electrode 3. The Zn 2+ (aq) ions in the 1 M solution 4. The Cu 2+ (aq) ions in the 1 M solution 003 10.0 points The standard potential of the cell Ag(s) | AgCl(s) | Cl (aq) || Cu 2+ (aq) | Cu(s) is +0.12 V at 25 C. If the standard potential of the Cu 2+ | Cu couple is +0.34 V, calculate the standard potential of the AgCl | Ag,Cl couple. 1.- 0.22 V 2.- 0.12 V 3. + 0.46 V 4.- 0.46 V 5. + 0.22 V 004 10.0 points If the standard potentials for the cou- ples Fe 3+ | Fe 2+ , MnO 2 4 , H + | Mn 2+ , H 2 O, Zn 2+ | Zn, V 3+ | V 2+ , and Br 2 | Br are +0.77, +1.51,- 0.76,- 0.26, and +1.09 V, respec- tively, which is the strongest oxidizing agent? 1. Br 2 2. Fe 3+ 3. Zn 2+ 4. Mn 2+ 5. MnO 2 4 005 10.0 points Hint: Once you have decided which way elec- trons flow in the external circuit, what sub- stance is AT each of the electrodes? Consider the voltaic cell: Pt Sn 4+ (0.0010 M), Sn 2+ (0.10 M) Ag + (0.010 M) Ag Sn 4+ + 2 e Sn 2+ E = +0 . 15 V Ag + + 1 e Ag(s) E = +0 . 80 V The electrons flow in the external circuit from 1. Ag to Sn 4+ . 2. Sn to Ag....
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This note was uploaded on 11/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Homework 9-problems - hernandez (ah29758) Homework 9...

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