Which of the following statements about catalysts is correct?

• A. A catalyst lowers the activation energy of a reaction.
• B. A catalyst changes the products of a chemical reaction.
• C. A catalyst is consumed during the reaction.
• D. A catalyst increases the equilibrium constant of a reaction.

Answer: (A)

Verified step by step guidance

1. Understand the role of a catalyst in a chemical reaction: A catalyst provides an alternative reaction pathway with a lower activation energy, which increases the reaction rate without being consumed.
2. Recall that a catalyst does not change the reactants or products; it only affects how quickly equilibrium is reached.
3. Recognize that a catalyst is not consumed in the reaction, meaning it can be used repeatedly.
4. Know that a catalyst does not affect the position of equilibrium or the equilibrium constant; it only helps the system reach equilibrium faster.
5. Based on these points, identify that the correct statement is: 'A catalyst lowers the activation energy of a reaction.'