At equilibrium, the two opposing reactions takes place at equal rates, or velocities, and hence there is no net change in the amounts of substances that are involved.
A chemical reaction is in equilibrium when there is no tendency for the quantities of reactants and products to change. They represent the same chemical reaction system in which the roles of the components are usually reversed, and both yield the same mixture of components when the change is completed fully.
A reversible chemical reaction is one in which the products, as soon as they are formed, react to produce the original reactants back. At equilibrium, generally the two opposing reactions go on at equal rates, or velocities, and hence there is no net change in the amounts of substances involved.
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