The following are factors that influence the rate of a reaction. Which are stated correctly?
I. The rate increases when the concentration of reactants decreases.
II. The rate increases when a catalyst is added.
III. The rate increases when the temperature increases.

Question

Quizplus · Accepted Answer

II and III are correct because adding a catalyst lowers the activation energy required for the reaction, thus increasing the rate, and increasing the temperature generally increases the kinetic energy of the molecules, leading to more frequent and effective collisions, thus also increasing the rate. I is incorrect because increasing the concentration of reactants typically increases the rate of reaction, not decreasing it.

The Following Are Factors That Influence the Rate of a Reaction