Which statement best describes homogeneous catalysis in chemical kinetics?

• A. The catalyst is in the same phase as the reactants.
• B. The catalyst is in a different phase than the reactants.
• C. The reaction rate decreases in the presence of a homogeneous catalyst.
• D. The catalyst is consumed during the reaction.

Answer: (A)

Verified step by step guidance

1. Understand the definition of catalysis: A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
2. Recognize the difference between homogeneous and heterogeneous catalysis: Homogeneous catalysis occurs when the catalyst and the reactants are in the same phase (e.g., all gases or all liquids), while heterogeneous catalysis involves catalysts and reactants in different phases (e.g., solid catalyst with liquid reactants).
3. Analyze the given options in the context of homogeneous catalysis: The catalyst must be in the same phase as the reactants for homogeneous catalysis.
4. Recall that catalysts are not consumed during the reaction; they participate temporarily and are regenerated by the end of the reaction.
5. Conclude that the correct description of homogeneous catalysis is that the catalyst is in the same phase as the reactants.