Question

question 3 of 10
what is the purpose of a catalyst?
a. to increase the kinetic energy of the reactants
b. to shift the equilibrium position of a reaction
c. to lower the activation energy of a reaction
d. to change the potential energy of the reactants

Explanation:

A catalyst is a substance that speeds up a chemical reaction. It does this by providing an alternative reaction pathway with a lower activation energy. Activation energy is the minimum energy required for a reaction to occur.

• Option A: Catalysts do not increase the kinetic energy of reactants. Kinetic energy is related to the motion of particles and is mainly affected by temperature.
• Option B: Catalysts do not shift the equilibrium position of a reaction. They only increase the rate at which equilibrium is reached.
• Option C: This is correct as explained above.
• Option D: Catalysts do not change the potential energy of reactants. Potential energy is related to the position and composition of substances.

Answer:

C. To lower the activation energy of a reaction