Question

Write short notes on :
(i) Activation energy
(ii) Arrhenium equation.

Answer 1

(i) Activation energy : According to Arrhenius any chemical reaction is only possible when reacting molecules are activated with minimum energy which is called threshold energy. Kinetic energy of most of the moIecules are less then this minimum energy. The excess energy which is required to activate reactant molecules, is called activation energy.
(ii) Arrhenius equation : Arrhenius represented the change in rate with temperature, for homogeneous gaseous reactions by the following reactions:
$K=A{e}^{-Ea/RT}$
It is called Arrhenius equation.
Here,
K= Rate of constant of reaction,
A= Frequency factor,
E= Activate energy,
R = Gas constant, and
T = Absolute temperature.