Question

Write two differences between 'order of reaction' and 'molecularity of reaction'.

Answer 1

Order	Molecularity
The overall order of reaction is the sum of all the exponents of all the reactants present in the rate law expression.	It is the number of reacting species taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction.
It is determined experimentally.	It is a theoretical concept.
It may be equal to zero or have fractional values.	It can not be equal to zero and it always have integral values( which cannot exceeds 3)