Which statement is true of a reversible reaction at equilibrium? a) The concentration of reactants is less than the concentration of products. b) The concentration of reactants and the concentration of products are equal. c)The concentration of reactants is greater than the concentration of products. d) The concentration of reactants and the concentration of products are constant. e) The concentration of reactants is decreasing and the concentration of products is increasing.

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Which statement is true of a reversible reaction at equilibrium? a) The concentration of reactants is less than the concentration of products. b) The concentration of reactants and the concentration of products are equal. c)The concentration of reactants is greater than the concentration of products. d) The concentration of reactants and the concentration of products are constant. e) The concentration of reactants is decreasing and the concentration of products is increasing.

Chemistry
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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The concentrations must be constant, because we have no idea about the reaction quotient K of what it's value is which tells us where the equilibrium lies. Say if K>1 then we know that the equilibrium favors products and the concentration of products must be greater. The opposite must be true if K<1 So, Without this information we can't say anything about whether the reactants or products are at a higher concentration. Instead, all we know is the general rule that defines equilibrium a state where the concentrations of both reactants and products are constant, implying that the foreword and reverse reactions occur at the same rate.

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