When a reversible reaction attains equilibrium it appears that the concentrations of individual reactants and that of the products remain constant with time that is they appear not to change. Apparently, the equilibrium appears as dead (or) as not proceeding that means the reaction seems to be stopped Actually, the reactant molecules are always reacting to form the product molecules.

When the product molecules are able to react with themselves under the same experimental condition to form the same amount of reactants simultaneously (at the same time) in an equal rate of the forward reaction, then the process is a ceaseless phenomenon. Thus chemical equilibrium is dynamic when the forward and reverse reactions take place endlessly and simultaneously with equal rates. Therefore chemical equilibrium is called as dynamic equilibrium.

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