Multiple Choice
Which type of substance is commonly used to increase the decomposition rate of hydrogen peroxide (H_2O_2)?
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15. Chemical Kinetics
Catalyst
Multiple Choice
Which of the following best describes how a catalyst can be recognized in a reaction mechanism?
A
It is present in the rate-determining step but not in any other step.
B
It is consumed in the first step and regenerated in the final step.
C
It appears only as a product in the overall reaction.
D
It is consumed and not regenerated during the reaction.
Verified step by step guidance1
Understand the role of a catalyst in a chemical reaction: a catalyst speeds up the reaction without being consumed in the overall process.
Recognize that in a reaction mechanism, a catalyst participates in one or more steps but is regenerated by the end of the mechanism, so it does not appear in the overall balanced equation as a reactant or product.
Identify that a catalyst is often consumed in an intermediate step but must be regenerated in a subsequent step, ensuring it is present at the start and end of the mechanism.
Note that the catalyst does not only appear as a product or only in the rate-determining step; it must be involved in multiple steps to facilitate the reaction.
Conclude that the best description is: the catalyst is consumed in the first step and regenerated in the final step, reflecting its temporary involvement and regeneration.
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