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 2492 views Chemistry