Rate of reaction
It is defined as the change in concentration of the reactant or product with time, each divided by its stoichiometric coefficient.
It is defined as the rate of chemical reaction when the concentration of each reactant appearing in the rate equation is taken as unity.
It always has a unit of (conc)/time.
Its units depends on the order of a reaction. For nth order reaction the units of rate constant
= (conc)1-n time-1
It depends on the initial concentration of the reactants.
It is independent of the initial concentration of the reactants.