An increase in the concentration of the reactants of a reaction leads to a change in

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Collision frequency is defined as the number of collisions between reacting molecules per unit volume per unit time.

When the concentration of reactants increases, the number of reactant molecules per unit volume increases. This results in a higher probability of molecules colliding with each other, thereby increasing the collision frequency.

Heat of reaction, threshold energy, and activation energy are characteristic properties of the specific reaction and are independent of the concentration of the reactants.

Answer: collision frequency

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