For a chemical system at equilibrium, the concentrations of both the reactants and the products must
(1) decrease
(2) increase
(3) be constant
(4) be equal
Answer and Explanation:
Some reactions go to completion, where the reactants react completely to form products. Other reactions, however, do not go to completion but rather reach equilibrium where as the reactants form products, product react to form reactants. At equilibrium, the rates of the forward and reverse reactions are equal. The concentration of both the reactants and the products are constant. Therefore, choice 3 is the correct answer choice.
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