CAPP Chemistry Lab Practice Test 2026 - Free Chemistry Lab Practice Questions and Study Guide

The primary effect of temperature on the rate of a chemical reaction is that it increases the kinetic energy of molecules. As temperature rises, the molecules move faster because they have more energy. This increased motion leads to a higher frequency of collisions between reactant molecules. Moreover, with more energy, a greater proportion of these collisions will have enough energy to overcome the activation energy barrier necessary for a reaction to occur. As a result, the rate of the chemical reaction increases.

The other options do not accurately describe the primary influence of temperature on reaction rates. For instance, decreasing the energy of reactants or stabilizing reactants does not typically occur with an increase in temperature. Additionally, while higher temperatures generally lead to faster reaction times due to increased kinetic energy, the specific phrasing of option D may imply a misunderstanding of how temperature influences rates rather than accurately reflecting the increase in energy and collision frequency.