Which of the following factors does not impact the rate of a chemical reaction?

• A. Temperature
• B. Presence of a catalyst
• C. Concentration of reactants
• D. Color of the reactants

Answer: (D)

Verified step by step guidance

1. Understand that the rate of a chemical reaction is influenced by factors that affect the frequency and energy of collisions between reactant molecules.
2. Recognize that temperature impacts reaction rates because increasing temperature generally increases the kinetic energy of molecules, leading to more frequent and energetic collisions.
3. Identify that the presence of a catalyst affects reaction rates by providing an alternative pathway with a lower activation energy, thus increasing the rate without being consumed in the reaction.
4. Acknowledge that the concentration of reactants influences reaction rates because higher concentrations lead to more collisions per unit time, increasing the likelihood of reaction.
5. Realize that the color of the reactants does not impact the rate of a chemical reaction, as it does not affect the molecular interactions or energy changes involved in the reaction process.