Which three factors affect the rate of a chemical reaction?

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The rate of a chemical reaction is mainly influenced by how often reacting molecules collide and whether those collisions have enough energy to overcome the activation barrier. Temperature increases molecular speed, boosting both collision frequency and the fraction of collisions energetic enough to react. Higher reactant concentration means more collisions per unit time, speeding up the process. A catalyst provides an alternative pathway with a lower activation energy, so more collisions lead to products without changing the amounts of reactants. Among the options, this trio—temperature, reactant concentration, and catalyst—covers the factors that universally affect reaction rate in most contexts. The other choices introduce factors like solvent, surface area, or volume/pressure that can alter rates in specific situations but not as universally applicable determinants across diverse reactions.