In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present at concentrations which have no further tendency to change with time. Usually, this state results when the forward reaction proceeds at the same rate as the reverse reaction. The reaction rates of the forward and reverse reactions are generally not zero but, being equal, there are no net changes in the concentrations of the reactant and product. This process is called dynamic equilibrium.
Read more about Chemical Equilibrium: Historical Introduction, Thermodynamics, Pure Substances, Multiple Equilibria, Effect of Temperature, Effect of Electric and Magnetic Fields, Types of Equilibrium, Composition of A Mixture
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