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The rate of reaction may be defined as the speed of the reactant reacting to obtaina product in a particular reaction at a particular time. The concentration of the reactant and product are represented into mole/L.

\({\bf{Rate = k}}{\left( {\bf{A}} \right)^{\bf{m}}}{\left( {\bf{B}} \right)^{\bf{n}}}^{}\)

Catalysed reaction has a lower activation energy because there is an enzyme present in the reaction. Un-catalysed reaction has a higher activation energy because there is no enzyme present in the reaction

The only difference between a catalysed reaction and an un-catalysed reaction is that the activation energy is different. There is no effect on the. Catalysis is the process of increasing the rate of a chemical reaction by adding a substance Catalysed reactions have a lower activation energy (rate-limiting free energy of activation) than the corresponding un-catalysed reaction, resulting in a higher reaction.\(\)

\(\begin{aligned}{}\left( {\bf{a}} \right){\bf{\;Ea = 90 - 75 = 25 KJ}}\\\left( {\bf{b}} \right){\bf{Ea = 80 - 75 = 5 KJ}}\end{aligned}\) \(\)

Catalysed reaction with an activation energy of about 70 kJshown in Diagram (b)