Rate law :-
The rate of reaction is directly proportional to molar concentration of reactant raised to simple power.
The experimentallly determined equation that expresses the rate of a chemical reaction in terms of molar concentration of reactants raised to simple power is called as rate law.
Consider, a reaction
The rate of above is given by
i.e.
proportionality constant called rate constant.
Note that, 'x' and 'y' are experimentallly determined quantities and may or may not be equal to 'a' and 'b'
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Elementary reaction :-
The reaction which take place in single step and cannot be broken down further into any simpler chemical reaction is called Elementary reaction.
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