Which of the following factors can influence the rate of a chemical reaction?

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

Answer: (D)

Verified step by step guidance

1. Understand that the rate of a chemical reaction depends on factors that affect how often and how effectively reactant particles collide with each other.
2. Recognize that temperature influences reaction rate because increasing temperature increases the kinetic energy of particles, leading to more frequent and energetic collisions.
3. Know that the presence of a catalyst affects the reaction rate by providing an alternative reaction pathway with a lower activation energy, thus speeding up the reaction without being consumed.
4. Realize that the concentration of reactants affects the rate because higher concentration means more particles in a given volume, increasing the likelihood of collisions.
5. Identify that the color of reactants does not directly influence the reaction rate, as it is a physical property related to light absorption and not to collision frequency or energy.