Difference between rate constant and rate of reaction

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Rate of reaction Rate constant

Rate of reaction is the change in concentration of a reactant or product per unit time It is a constant of proportionality in the rate law equation and is equal to the rate of reaction when the molar concentration of each of the reactions is unity.

The rate of reaction at any instant of time depends upon the molar concentrations of the reactants at that time. The rate constant is constant for a particular reaction at a particular temperature and does not depend upon the concentrations of the reactants.

Its units are always, M / s (molarity per second) It units depend upon the order or reaction. A reaction is said to be of the zero order, first order, second order, and third order if some of the concentration terms are equal to 0, 1, 2 and 3 respectively

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Rate of reaction	Rate constant
Rate of reaction is the change in concentration of a reactant or product per unit time	It is a constant of proportionality in the rate law equation and is equal to the rate of reaction when the molar concentration of each of the reactions is unity.
The rate of reaction at any instant of time depends upon the molar concentrations of the reactants at that time.	The rate constant is constant for a particular reaction at a particular temperature and does not depend upon the concentrations of the reactants.
Its units are always, M / s (molarity per second)	It units depend upon the order or reaction. A reaction is said to be of the zero order, first order, second order, and third order if some of the concentration terms are equal to 0, 1, 2 and 3 respectively