Quiz3_scooby_key

Quiz3_scooby_key - Chem 125 Spring 2008 Quiz#3 Scooby-Doo...

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Chem 125 Quiz #3 Scooby-Doo Dr. Retsek Spring 2008 NAME: ___ KEY __________________________ 1. (10 points) For the reaction BrO 3 1- (aq) + 5Br 1- (aq) + 6 H + (aq) Æ 3 Br 2 (l) + 3 H 2 O (l) the following initial rate data were collected at constant temperature. Trial [BrO 3 1- ], M [Br 1- ], M [H + ], M Rate, M min -1 1 0.10 0.10 0.10 8.0 x 10 -4 2 0.20 0.10 0.10 1.6 x 10 -3 3 0.20 0.20 0.10 3.2 x 10 -3 4 0.10 0.10 0.20 3.2 x 10 -3 a. Write the correct rate law for this reaction. rate = k[BrO 3 1- ] [Br 1- ][H + ] 2 You must show or explain how your answer in order to receive full credit. Compare trial 1 to 2 rate 1 = k[BrO 3 1- ] 1 x [Br 1- ] 1 y [H + ] 1 z = 8.0 x 10 -4 M min -1 = k[0.10] x [0.10] y [0.10] z rate 2 = k[BrO 3 1- ] 2 x [Br 1- ] 2 y [H + ] 2 z 1.6 x 10 -3 M min -1 = k[0.20] x [0.10] y [0.10] z 0.5 = (0.5) x ` x = 1 Compare trial 2 to 3 1.6 x 10 -3 M min -1 = k[0.20] x [0.10] y [0.10] z 3.2 x 10 -3 M min -1 = k[0.20] x [0.20] y [0.10] z 0.5 = (0.5) y y =1 Compare trial 1 to 4 8.0 x 10
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Quiz3_scooby_key - Chem 125 Spring 2008 Quiz#3 Scooby-Doo...

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