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What is the reason for the difference in rates in chemical kinetics?

The reason for the difference in rates in chemical kinetics is that a reaction involves the breaking and making of bonds. Since different bonds require different amounts of energy for breaking and different amounts of energies are evolved when different kinds of new bonds are formed, the rates of different of different reactions are different. The instantaneous nature of the ionic reactions is due to the fact that these do not involve any breaking of bonds as ions are already present in the aqueous solutions.