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Homework #7 - purdy(sbp456 Homework 7 owers(53885 This...

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purdy (sbp456) – Homework 7 – flowers – (53885) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. HW 7 due 07 November 2008 at 11PM, Solutions to follow at 11:05 PM. 001 10.0 points Consider the oxidation-reduction reaction Na 2 SnO 2 + Bi(OH) 3 -→ Bi + Na 2 SnO 3 + H 2 O What is the coefficient of Bi in the balanced equation? 1. 3 2. 2 3. None of these 4. 1 5. 4 6. 12 7. 10 8. 8 9. 6 10. 5 002 10.0 points Oxidation occurs 1. at the anode. 2. at both anode and cathode. 3. at the cathode. 4. at either, depending on whether the cell is electrochemical or electrolytic. 5. in the electrolyte. 003 10.0 points In an electrochemical cell, the electrode at which reduction takes place is called the 1. anode. 2. cathode. 3. It depends upon whether the cell is gal- vanic or electrolytic. 004 10.0 points Consider the half-reactions and the bal- anced equation for the cell reaction repre- sented by the skeletal equation Mn(s) + Ti 2+ (aq) Mn 2+ (aq) + Ti(s) . What is the proper cell diagram for this reac- tion? 1. Ti(s) | Ti 2+ (aq) || Mn 2+ (aq) | Mn(s) 2. Mn 2+ (aq) | Mn(s) || Ti(s) | Ti 2+ (aq) 3. Mn(s) | Mn 2+ (aq) || Ti 2+ (aq) | Ti(s) 4. Ti 2+ (aq) | Ti(s) || Mn(s) | Mn 2+ (aq) 005 10.0 points The reaction 2 Na + + 2 Cl 2 Na + Cl 2 is indicative of ? cell; the sign of the anode is ? . 1. a voltaic; negative 2. an electrolytic; positive 3. an electrolytic; negative 4. a voltaic; positive 006 10.0 points
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purdy (sbp456) – Homework 7 – flowers – (53885) 2 Zinc (Anode) Silver (Cathode) 1 . 56 V V Voltmeter e e 1 M Zn 2+ (aq) 1 M Ag + (aq) Salt bridge to carry ions In this electrochemical cell, what is the re- duction half reaction? 1. Zn 2+ (aq) + 2 e Zn(s) 2. Ag(s) Ag + (g) + e 3. Zn(s) Zn 2+ (aq) + 2 e 4. Ag + (g) + e Ag(s) 007 10.0 points What is the cell potential of the following cell?
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