Which of the following actions will increase the rate of a chemical reaction?

• A. Lowering the temperature
• B. Decreasing the surface area of a solid reactant
• C. Removing a catalyst
• D. Increasing the concentration of reactants

Answer: (D)

Verified step by step guidance

1. Understand that the rate of a chemical reaction depends on factors such as temperature, surface area, presence of a catalyst, and concentration of reactants.
2. Recall that increasing temperature generally increases reaction rate because particles have more kinetic energy and collide more frequently and energetically.
3. Recognize that increasing the surface area of a solid reactant increases the reaction rate by providing more area for collisions to occur.
4. Know that catalysts increase reaction rate by lowering the activation energy without being consumed in the reaction.
5. Understand that increasing the concentration of reactants increases the frequency of collisions, thereby increasing the reaction rate.