Chemistry Regents Practice Test 2025 – The All-in-One Guide to Exam Success!

The rate of a chemical reaction is influenced by several factors, including concentration, temperature, and the presence of catalysts. Concentration affects the number of reactant particles in a given volume, increasing the likelihood of collisions that can lead to reactions. Temperature generally affects the energy of the reactant particles; higher temperatures increase particle movement and energy, leading to more frequent and energetic collisions. Catalysts can speed up reactions by providing an alternative pathway with a lower activation energy, allowing the reaction to proceed faster.

The color of reactants does not play a role in determining the rate of reaction. While color can indicate a change in chemical composition for some reactions, it does not affect the fundamental kinetic principles that govern how quickly reactants turn into products. Thus, this factor is not relevant to the kinetics of a chemical reaction, making it the correct answer in this context.