Which factor would most influence the rate of a chemical reaction?

• A. Number of products formed
• B. Temperature
• C. Color of container
• D. Time of day

Answer: (B)

The rate of a chemical reaction depends on how often particles collide and how energetically they collide. Temperature directly affects this: when the temperature rises, particles move faster and have greater kinetic energy, so they collide more often and with enough energy to overcome the activation energy of the reaction. That combination makes more successful collisions occur in a given amount of time, speeding up the reaction.

The other options don’t change the speed in a meaningful way. The number of products formed describes how far the reaction has progressed, not how quickly it goes. The color of the container and the time of day have no impact on the molecular collisions or energy driving the reaction.