Integrated Rate Laws

(a)  Zero Order Reactions


Examples of zero order reactions:


Generally, decomposition of gases on metal surfaces at high concentrations follow zero order kinetics.


(b) First order Reactions:



First order growth reaction:


For bacterial multiplication of virus growth use following concept

Generation Time:



Examples of 1st order reaction:



(c)   Second order Reactions:


Second order reaction is determined by the variation of two concentration terms or rate of the reaction is proportional to the second power of the concentration of a single substance.


They are of two types:


1.      When the concentration of the reactants is same,

2.      When the concentration of the reactants is different,


(d) Pseudo first order reaction:


A second order (or of higher order) reactions can be converted into a first order reaction if the other reactant is taken in large access. Such first order reactions are known as pseudo first order reactions.   


For A + B → Products    Rate = K[A]1[B]1

Now if 'B' is taken in large access

'b' is very large can be taken as constant

  • K1 is pseudo first order rate.

  • K1 will have units of first order.

  • K will have units of second order.

Post By : Mohit Rana 06 Mar, 2019 3721 views Chemistry