Which component is affected when a catalyst is added to a chemical reaction?

A.) the amount of substrate

B.) the activation energy

C.) the amount of product

D.) the concentration of reactants

The component that is affected due to addition of a catalyst is B. The activation Energy.

The component of the reaction that is affected by the addition of catalyst is the activation energy. So, the answer to this item is letter B. Catalyst lowers down the activation energy or the energy needed for the reaction to happen. Subsequently, allowing the reaction to finish faster.