Collision Theory explains how chemical reactions occur when particles collide with sufficient energy and proper orientation. According to this theory, for a reaction to take place, the reacting molecules must come together in a way that allows them to break existing bonds and form new ones. The frequency and energy of these collisions determine the rate of the reaction. Factors such as temperature, concentration, and the presence of a catalyst can influence the number and energy of collisions. For instance, increasing the temperature typically increases the speed of particles, leading to more frequent and energetic collisions, which can enhance the reaction rate.