Question

question 28 of 32
how does the rate of a reaction change after a catalyst is added?

a. the rate decreases.

b. the rate remains the same.

c. the rate increases.

d. the rate becomes zero.

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur, without being consumed in the process. So when a catalyst is added, the reaction rate increases. Option A is incorrect as catalysts don't decrease rate. Option B is wrong because catalysts do affect the rate. Option D is incorrect as catalysts don't stop the reaction (make rate zero).

Answer:

C. The rate increases.