If increasing the concentration of A in a chemical reaction causes no increase in the rate of the reaction, then we may say:

Question

Quizplus · Accepted Answer

If increasing the concentration of A does not increase the rate of the reaction, it means the reaction rate is independent of the concentration of A. In other words, the reaction rate is zero order in [A]. Choice A is incorrect because if A were a catalyst, increasing its concentration would increase the reaction rate. Choices B and D are also incorrect because a zero-order reaction rate means the rate is independent of the concentration of A, while a first-order reaction rate would mean the rate is directly proportional to the concentration of A. Choice E is not necessarily true, as A could still be involved in the reaction as a reactant but just not influence the rate.

If Increasing the Concentration of a in a Chemical Reaction