Question

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

Explanation:

A catalyst speeds up a reaction without being consumed. So its amount remains unchanged.

Answer:

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