Q.Write Arrhenius equation and explain the terms involved.

The Arrhenius equation, $k=Ae^{-E_a/RT}$, is the fundamental relationship showing how a reaction's rate constant depends exponentially on temperature and activation energy, with $A$ capturing the frequency and orientation of effective molecular collisions.

The Arrhenius equation is written: $k = A\,e^{-E_a/RT}$ where:

• $k$ is the rate constant of the reaction at temperature $T$.
• $A$ is the pre-exponential factor (also called the frequency factor or Arrhenius factor) — related to the frequency of collisions between reactant molecules and the fraction of those collisions having the correct orientation for reaction; it has the same units as $k$.
• $E_a$ is the activation energy of the reaction — the minimum extra energy that colliding reactant molecules must possess (over their average energy) for the reaction to occur, usually expressed in $J\,mol^{-1}$ or $kJ\,mol^{-1}$.
• $R$ is the universal gas constant ($8.314\ J\,K^{-1}mol^{-1}$).
• $T$ is the absolute temperature (in Kelvin). …