Question

in a chemical reaction, what role does a catalyst play?
a. consumes all reactants
b. decreases activation energy
c. increases activation energy
d. has no effect on activation energy

Explanation:

A catalyst is a substance that speeds up a chemical reaction by providing an alternative reaction pathway with a lower activation energy. It is not consumed in the reaction and does not affect the amounts of reactants or products in the long - run equilibrium.

Answer:

B. Decreases activation energy