To increase the rate of a chemical, a catalyst

 To increase the rate of a chemical, a catalyst 

A. decreases the activation energy

B. increases the activation

C. decreases the collision frequency

D. increases the collision frequency

The correct answer is:

A. decreases the activation energy ✅

Explanation:
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It works by providing an alternative reaction pathway with lower activation energy, which allows more reacting particles to successfully collide and form products.

• B. increases the activation energy → ❌ would slow the reaction.

• C. decreases the collision frequency → ❌ slows the reaction.

• D. increases the collision frequency → ❌ sometimes helps, but the main effect of a catalyst is lowering activation energy, not changing collisions.

✅ Answer: A

PQN: 17