The decomposition of hydrogen peroxide is catalyzed by iodideion. The catalyzed

Question

The decomposition of hydrogen peroxide is catalyzed by iodideion. The catalyzed reaction is thought to proceed by a two-stepmechanism: 1.H2O2(aq) + I-(aq) H2O(l)+IO-(aq)             (slow) 2.IO-(aq) +H2O2(aq)H2O(l)+O2(g)+I-(aq)     (fast) a. assuming that the first step of the mechanism is ratedetermining, predict the rate expression for the overallprocess. b. Write the chemical equation for the overall process. c. Identify the intermediate, if any, in the mechanism. d. What distinguishes an intermediate from a catalyst in thechemical reaction The decomposition of hydrogen peroxide is catalyzed by iodideion. The catalyzed reaction is thought to proceed by a two-stepmechanism: 1.H2O2(aq) + I-(aq) H2O(l)+IO-(aq)             (slow) 2.IO-(aq) +H2O2(aq)H2O(l)+O2(g)+I-(aq)     (fast) a. assuming that the first step of the mechanism is ratedetermining, predict the rate expression for the overallprocess. b. Write the chemical equation for the overall process. c. Identify the intermediate, if any, in the mechanism. d. What distinguishes an intermediate from a catalyst in thechemical reaction

Explanation / Answer

1.  H2O2(aq) + I-(aq) H2O(l) + IO-(aq)              (slow)

2.  IO-(aq)+ H2O2(aq) H2O(l) + O2(g) +I-(aq)   (fast)

It becomes2H2O2(aq) 2H2O(l) + O2(g)

(Note: H2O2 is not an intermediatebecause in both equations, they are on the same side of theequation. If it was on the reactant side of the first step and theproduct side of the second step, then it would be anintermediate)

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