Most reactions have a reaction mechanism.
Catalysts increase the rate of a reaction by offering an alternative reaction mechanism of lower activation energy. Research involving reaction mechanisms results in medical, commercial, and industrial advances that affect our everyday lives. Point out how many particles must collide according to the balanced equation and review the probability of collisions involving more than three particles. Discuss, demonstrate the reaction, and have students explain how it is possible for the reaction to occur. Discuss the fundamentals of reaction mechanisms.