According to Collision Theory, the rate of reaction depends on two factors:

1. Collision Frequency ($Z$): The number of collisions per unit volume per unit time. As temperature increases, molecules move faster, increasing $Z$.
2. Effective Collisions: Only some collisions result in a reaction. For success, the colliding molecules must have energy $\ge E_a$.

• According to the Maxwell-Boltzmann distribution, a small increase in temperature substantially increases the fraction of molecules that possess enough energy to cross the activation barrier.
• Both factors contribute, but the energy factor is much more significant.