Which of the following statements explains how concentration of a solution affects the rate of a reaction? when concentration decreases, kinetic energy increases. when concentration increases, particles collide less often. when concentration increases, particles collide more often. when concentration decreases, collision of particles increases.

When concentration increases, particles collide more often. This is caused by the increased number of particles per unit volume compared to when the concentration is low. For a successful reaction, there must be a collision resulting to the formation of new particles. The higher the rate of collisions the higher the rate of reaction.

Option (c) is the correct answer.

Explanation:

Increase in concentration means there are more number of solute particles present in a solvent.

Hence, this will lead to more number of collisions between the particles. As a result, there will be increase in kinetic energy of particles of solution.

As we known that rate of reaction directly depends on the number of collisions. So, this will lead to increase in rate of reaction.

Thus, we can conclude that the statement when concentration increases, particles collide more often, best explains how concentration of a solution affects the rate of a reaction.