In class we watched a demonstration where the color of the solution oscillated b

Question

In class we watched a demonstration where the color of the solution oscillated between orange and blue. This is a very complicated reaction with multiple pathways the reaction can take. One pathway can be described as follows: H_2O_2 + 3 I^- + 2 H^+ rightarrow I_3^- + 2 H_2O H_2O_2 + H^+ rightarrow H_3O_2^+ H_3O_2^+ + I^- rightarrow H_2O + HOI HOI + I^- rightarrow OH^- + I_2 OH^- + H^+ rightarrow H^2O I_2 + I^- rightarrow I_3^- Which of the following statements about this proposed mechanism is false based on the information given? All steps after the highest peak WILL NOT be involved in the rate law for the reaction The reaction coordinate diagram for this reaction will have five peaks Intermediate species are found in the valleys of the reaction coordinate diagram The products will be lower in energy than the reactants in this reaction coordinate diagram The activation energy for the reverse react reaction will be the energy from the products to the highest peak of

Explanation / Answer

The incorrect statement about the given reaction is the first one. The rate limiting step of the reaction is the slowest step of the reaction. Consequently, the activation energy for the slowest step of the reaction is the highest. Infacty, only the step with the highest energy is involved in the rate determinining step. No step before or after this step is involved in the rate determining step. Hence the given statement is partly correct. The given statement should be modified to read as only the step with the highest peak will be involved in the rate law for the reaction.

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