Which of the following is NOT a factor affecting the rate of reaction?

The rate of a chemical reaction can be influenced by several factors, including temperature, surface area, and the presence of a catalyst. Temperature affects the kinetic energy of the particles; as the temperature increases, particles move faster, resulting in more frequent and energetic collisions, which enhances the reaction rate. Surface area increases the exposure of reactant molecules to each other, allowing for more collisions to occur per unit time. Catalysts lower the activation energy of a reaction, providing an alternative pathway for the reaction to proceed more rapidly without being consumed in the process.

In contrast, the amount of light does not generally influence the rate of reaction for most chemical processes, particularly those that are not photochemical in nature. Therefore, light is not a relevant factor unless specifically dealing with reactions that involve light energy, such as photosynthesis or certain types of photochemical reactions. This is why the correct choice is the amount of light; it does not serve as a standard factor affecting the rate of reaction.