The equation clearly shows that increase of temperature or lowering of Ea will
lead to an increase in the rate of reaction and presence of a catalyst lowers the
activation energy by providing an alternate path for the reaction According to
collision theory, another factor P called steric factor which refers to the orientation
of molecules which collide, is important and contributes to effective collisions,
thus, modifying the Arrhenius equation to 
a /
ZAB
e E
RT
k
P

 Rationalised 2023-24
85
Chemical Kinetics
3 1
From the rate expression for the following reactions, determine their
order of reaction and the dimensions of the rate constants