CHEMISTRY RATE OF REACTION EXAM QUESTIONS AND ANSWERS 2024

rate of chemical reaction A rate is a measure of how much something changes within a specified amount of time. In chemistry, the rate of a chemical reaction, or the reaction rate, is usually expressed as the change in the amount of reactant or product per unit time. Collision Theory A model called collision theory is used to relate the properties of particles to the rates of chemical reactions. According to collision theory, atoms, ions, and molecules can react to form products when they collide if the particles have enough kinetic energy. Particles that do not have enough energy to react bounce apart unchanged when they collide. activation energy. The minimum energy that colliding particles must have in order to react is called the activation energy. You can think of the activation energy for a reaction as a barrier that reactants must cross before products can form.