Question

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which statement best describes the amount of catalyst that remains at the end of a reaction? less catalyst is present at the end than at the beginning of the reaction. the amount of catalyst is the same at the end as at the beginning of the reaction. more catalyst is present at the end than at the beginning of the reaction. the catalyst is consumed by the reaction, so none remains at the end of the reaction.

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. So, the amount of catalyst at the end of the reaction should be the same as at the beginning. Let's analyze each option:

• "Less catalyst is present at the end than at the beginning of the reaction." → Incorrect, as catalysts aren't used up.
• "The catalyst is consumed by the reaction, so none remains at the end of the reaction." → Incorrect, catalysts are not consumed.
• "The amount of catalyst is the same at the end as at the beginning of the reaction." → Correct, matches the definition of a catalyst.
• "More catalyst is present at the end than at the beginning of the reaction." → Incorrect, catalysts don't increase in amount during the reaction.

Answer:

The amount of catalyst is the same at the end as at the beginning of the reaction.