Which statement best defines chemical equilibrium for a chemical reaction occurring…
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
Which statement best defines chemical equilibrium for a chemical reaction occurring in a closed system at constant temperature?
(a) At equilibrium, the forward and reverse reaction rates are zero, so the concentrations of reactants and products remain unchanged.
(b) Chemical equilibrium is achieved when the concentrations of reactants and products become equal, causing the reaction to cease.
(c) The forward and reverse reaction rates are equal, so the concentrations of all species remain constant over time.
(d) Equilibrium is reached when the ratio [reactants][products] becomes 1 and stays constant thereafter.