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Catalysts DO speed up reactions. You're right that catalysts lower activation energy by providing an alternate mechanism for the reaction. If you look at the exponential form of the Arrhenius equation, when you decrease activation energy, you are increasing the rate of the reaction exponentially.
they do have an effect. catalysts lowerr the Ea for both the forward and reverse rxns and thus the rxn would happen faster in both the forward and reverse rxns. Therefore the rate of the entire reaction would increase. Look at rxn profile to help you visualize what happens --> it would make a lot more sense seeing how the rxn pathyway changes with a catalyst.
chari_maya 3B wrote:Question 7.17E asks whether a catalyst accelerating the third step of a three step reaction would increase the overall rate of reaction. Why is the answer no?
I think the answer is no because the rate of the overall reaction depends on the slowest step of the reaction and the third step is the fastest, so the addition of a catalyst shouldn't affect the overall reaction.
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