What overall effect does adding a catalyst have on a chemical reaction?

• A. It decreases the activation energy and shifts the equilibrium position.
• B. It increases the rate of the reaction without being consumed.
• C. It changes the products formed in the reaction.
• D. It increases the equilibrium constant of the reaction.

Answer: (B)

Verified step by step guidance

1. Understand that a catalyst provides an alternative reaction pathway with a lower activation energy, which increases the rate at which the reaction reaches equilibrium.
2. Recognize that a catalyst is not consumed in the reaction, meaning it can be used repeatedly without being permanently changed.
3. Know that while a catalyst speeds up both the forward and reverse reactions equally, it does not affect the position of the equilibrium or the equilibrium constant.
4. Realize that a catalyst does not change the products formed; it only helps the reaction reach equilibrium faster.
5. Summarize that the overall effect of adding a catalyst is to increase the reaction rate without altering the equilibrium position or the nature of the products.