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quiz4BW08_key - Chem 125 Winter 2008 Quiz#4 Bullwinkle Dr...

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Chem 125 Quiz #4 Bullwinkle Dr. Retsek Winter 2008 NAME: ____ KEY _____________________________ 1. (4 points) Check ( ) whether the statement is true or false. Statement True False a. Reduction occurs at the cathode of a voltaic cell. b. Iron (Fe) will be a stronger reducing agent than tin (Sn). Iron has a lower half-cell potential (-0.44V vs. -0.14V) than tin so it would prefer to be oxidized which happens by reducing agent. c. Cobalt (Co) would be capable of acting as a sacrificial anode when used with an iron (Fe) pipe. Cobalt has a higher reduction potential than iron and would prefer to be reduced, so iron would be oxidized instead of Cobalt. d. In the balanced redox reaction, 6 Br 1- (aq) + Cr 2 O 7 2- (aq) + 14 H + (aq) 3 Br 2 (l) + 2 Cr 3+ (aq) + 7 H 2 O (l) there are 5 moles of electrons transferred. There are 6 moles of electrons transferred here. Br 2 -> 2 Br (transfers 2 electrons but it is multiplied by 3) so transfer of 6. 2. (6 points) a. Balance the following skeleton reaction: SO 3 2- (aq) + Cl 2 (g) SO 4 2- (aq) + Cl 1- (aq) [basic] 1. SO 3 2 - SO 4 2- Cl 2 2 Cl 1- 2. SO
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