What is the primary benefit of using a catalyst in a chemical reaction between two substances?

• A. It changes the equilibrium position of the reaction.
• B. It increases the yield of products by creating new reactants.
• C. It raises the activation energy required for the reaction.
• D. It increases the reaction rate without being consumed.

Answer: (D)

Verified step by step guidance

1. Understand that a catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
2. Recognize that catalysts work by providing an alternative reaction pathway with a lower activation energy, which allows more reactant molecules to have enough energy to react.
3. Note that catalysts do not change the equilibrium position of the reaction; they only help the system reach equilibrium faster.
4. Realize that catalysts do not increase the yield by creating new reactants; the amount of products at equilibrium depends on the reaction conditions and equilibrium constant.
5. Remember that catalysts lower, not raise, the activation energy, which is why the reaction rate increases.