Question

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 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 concentration is never included in a rate law not 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.

Answer 1

Answer: (C)

A catalyst concentration is never included in a rate law not is the actual catalyst shown in any step of a chemical reaction.

Catalyst concentration is never included in rate law and do not appear in the balanced overall chemical equation but it can be shown in intermediate products where it is used to increase the speed of reaction and form intermediate products