1. Arrhenius equation.
2. The excess amount of energy that is to be given to the reactant molecules in order to involve in a chemical reaction is called activation energy (Ea).
3.

4. By noting the value of k, we can predict the speed of a chemical reaction. In the case of a fast reaction, the value of k is high and in the case of a slow reaction value of k is small. By noting the unit of rate constant, we can predict the order of chemical reaction.