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.

Question

Emmy Cain

Chemistry

21 December, 17:44

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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Summer · Answer 1

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.