Define Rate law and Rate constant.

Explanation

Rate law : It is the expression which relates the rates of reaction with concentration of the reactants. In rate law, the rate of the reaction is expressed as function of the concentration of reactant and products present in the reaction `A+B rarr C`, For a reaction rate law `= K[A] [B]`
Rate constant : When the concentration of reactants is unity, then the rate of reaction is known as rate constant. It is also called specific reaction rate.