CHhmwk8 - moore (jwm2685) Homework 8 vanden bout (51640) 1...

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Unformatted text preview: moore (jwm2685) Homework 8 vanden bout (51640) 1 This print-out should have 37 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. ******Note: You will need a table of stan- dard reduction potentials to complete this homework assignment. These can be found online, as well as in your textbook.********* 001 10.0 points Sodium is produced by electrolysis of molten sodium chloride. What are the products at the anode and cathode, respectively? 1. O 2 (g) and Na( ) 2. Cl 2 (g) and Na 2 O( ) 3. Cl 2 (g) and Na( ) correct 4. Cl (aq) and Na 2 O( ) 5. Na( ) and O 2 (g) Explanation: 002 10.0 points What is the standard cell potential of the strongest battery that could be made using these half reactions? 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 1. 1.84 2. 1.03 3. 1.11 4. 2.56 correct 5. 1.83 6. 1.04 Explanation: The strongest reducing agent is Co 3+ and the strongest oxidizing agent is Zn. The stan- dard cell potential of a battery built from these species would be: E cell = E cathode- E anode = 1 . 80- - . 76 = 2 . 56 003 10.0 points Which metal will dissolve in hydrochloric acid? 1. Au 2. Pt 3. Ag 4. Fe correct 5. All will dissolve. Explanation: 004 10.0 points What would be the E cell of an electrolytic cell made from the following two half reac- tions? Half reaction E AgCl( s ) + e - Ag( s ) + Cl ( aq ) +0 . 22 Al 3+ ( aq ) + 3 e - Al( s )- 1 . 66 1.- 1 . 44 2. 1 . 88 3. 1 . 44 4.- 1 . 88 correct Explanation: E = E cathode- E anode =- 1 . 66- . 22 =- 1 . 88 005 (part 1 of 3) 10.0 points The galvanic cell below uses the standard half-cells Mg 2+ | Mg and Zn 2+ | Zn, and a salt bridge containing KCl(aq). The voltmeter moore (jwm2685) Homework 8 vanden bout (51640) 2 gives a positive voltage reading.- + A B voltmeter D C E F Salt Bridge Identify A and write the half-reaction that occurs in that compartment. 1. Mg(s); Mg 2+ (aq) + 2 e Mg(s) 2. Zn(s); Zn 2+ (aq) + 2 e Zn(s) 3. Mg(s); Mg(s) Mg 2+ (aq) + 2 e cor- rect 4. Zn(s); Zn(s) Zn 2+ (aq) + 2 e Explanation: 006 (part 2 of 3) 10.0 points What happens to the size of the electrode A during the operation of the cell? 1. decreases correct 2. No change 3. increases Explanation: 007 (part 3 of 3) 10.0 points What is the voltmeter reading? 1. +3.40 V 2. +4.30 V 3. +0.50 V 4. +1.60 V correct 5. +2.50 V Explanation: 008 10.0 points For any voltaic cell which produces electrical energy available to do external work, which of the following statements is always true?...
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CHhmwk8 - moore (jwm2685) Homework 8 vanden bout (51640) 1...

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