how to identify the orders of any reaction?

In the rate equation

 

Rate = K[A]^x [B]^y 

The x and y represents the dependence of the rate of reaction to change in the concentration of Aand B.

 

 The sum of these exponents (x + y) in the above equation gives the overallorder of a reaction.

Hence,

 

The sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction.

 

For example, if the rate expression of a particular reaction is

 

             Rate = K[A]^1/2 [B]^3/2 

 

Then the order of the reaction will be

 

          

The reaction is of second order.