S12_1252_Exam_2_Key

30 0050 0050 570105 2 030 0025 010 114104 3 040 0050

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Unformatted text preview: 3.8 10‐5 M/s +1 correct answer t 1 missing/incorrect units 3 5. The bromination of acetone is acid‐catalyzed: H+ CH3COCH3 + Br2 CH3COCH2Br + H+ + Br The rate of disappearance of bromine was measured for several different concentrations of acetone, bromine, and H+ ions at a certain temperature: Experiment [Br2]0 [H+]0 Rate of Br2 Disappearance [CH3COCH3]0 (M) (M) (M) (M/s) 1 0.30 0.050 0.050 5.70 10‐5 2 0.30 0.025 0.10 1.14 10‐4 3 0.40 0.050 0.20 3.04 10‐4 4 0.30 0.10 0.050 5.70 10‐5 +1 k, +1 each correct order (a) Which experiments MUST you compare first to find (b) Write the overall rate law. the order with respect to one of the reactants? rate = k[CH3COCH3][H+] 4 1 2 3 4 circle two (c) What are the M‐1s‐1 +2 all or nothing 2 units for k? 2 +2 consistent with b (d) Even though H+ is not technically a reactant in this reaction, it does appear in the rate law. What is its role in this reaction, and how does its role justify its appearance in the rate law? H+ is a catalyst....
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This note was uploaded on 09/20/2012 for the course CHEM 1252 taught by Professor Jew during the Fall '12 term at UNC Charlotte.

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