Question

7. How do catalysts speed up reactions?
A. They increase the surface area of reactants.

B.They increase the temperature of the reaction.

C.They stir the reactants, causing more particle collisions.

D.They lower the energy barrier of a reaction.



PLEASE HELP URGENT

Answer 1

Answer:

D

Explanation:

A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction.

Answer 2

Answer:

They lower the energy barrier of a reaction.

Explanation: