At the higher temperatures the enzymes become

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(Reference: Chang 13.61)12. The bromination of acetone is acid-catalyzed: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: [CH3COCH3][Br2][H+] Rate of Disappearance of Br2(M/s)(1)0.300.050.0505.7 × 10–5(2)0.300.100.0505.7 × 10–5(3)0.300.050.101.2 × 10–4(4)0.400.050.203.1 × 10–4(5)0.400.050.0507.6 × 10–5a.What is the rate law for the reaction? (5 points)
b.Determine the rate constant. (5 points)
13. Briefly comment on the effect of a catalyst on each of the following: (a) activation energy, (b) reaction mechanism, (c) enthalpy of reaction, (d) rate of forward step, (e) rate of reverse step. (15 points)(a)A catalyst will increase the rate by lower the activation energy needed for the reaction.(b)A catalyst does not affect the enthalpy.(c)A catalyst increases the rate of the forward reaction step.(d)A catalyst increase the rate of a reverse reaction step. (Reference: Chang 13.91)

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