quiz4AW08_key - Chem 125 Winter 2008 Quiz#4 Rocky Dr Retsek...

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Chem 125 Quiz #4 Rocky Dr. Retsek Winter 2008 NAME: ___ KEY ______________________________ 1. (4 points) Check ( ) whether the statement is true or false. Statement True False a. Oxidation occurs at the cathode of a voltaic cell. Oxidation happens at the anode. b. Cobalt (Co) will be a stronger reducing agent than iron (Fe). Cobalt has a higher half-cell potential (-0.28V vs. -0.44V) than iron so it would prefer to be reduced which happens by oxidizing agent. c. Tin (Sn) would be capable of acting as a sacrificial anode when used with an iron (Fe) pipe. Tin has a higher reduction potential than iron and would prefer to be reduced, so iron would be oxidized instead of tin. 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 4 2- (aq) + Cl 1- (aq) SO 3 2- (aq) + Cl 2 (g) [basic] 1. SO 4 2- SO 3
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