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Moderate

Catalyst Definition

APCHEM-8EJQE8

A catalyst is defined as a substance that changes the speed of a reaction without being used in the reaction.

Which of the following statements is NOT an accurate description of a catalyst?

A

A catalyst can be homogeneous, meaning it is in the same phase as the reaction medium.

B

A catalyst can be heterogeneous, which involves the adsorption of a reactant molecule onto the surface of the catalyst at an active site.

C

A catalyst's concentration is never included in a rate law nor is the actual catalyst shown in any step of a chemical reaction.

D

A catalyst increases the rate of the reaction by providing a new reaction path with a lower activation energy.