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5 March, 10:18

Which of the following is true about a system at equilibrium? a The concentration (s) of the reactant (s) is equal to the concentration (s) of the product (s). b No new product molecules are formed. c The concentration (s) of reactant (s) is constant over time. d The rate of the reverse reaction is equal to the rate of the forward reaction and both rates are equal to zero. e None of the above (a-d) is true.

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  1. 5 March, 14:11
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    c The concentration (s) of reactant (s) is constant over time.

    Step-by-step explanation:

    When the reaction A ⇌ B reaches equilibrium, the concentrations of reactants and products are constant over time.

    a is wrong, because the concentrations of reactants and products are usually quite different.

    b is wrong, because both product and reactant molecules are being formed at equilibrium.

    d is wrong. The rates of the forward and reverse reactions are equal, but they are not zero.
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