When a Chemical System Is at Equilibrium

Multiple Choice

When a chemical system is at equilibrium,

A) the concentrations of the reactants are equal to the concentrations of the products.
B) the concentrations of the reactants and products have reached constant values.
C) the forward and reverse reactions have stopped.
D) the reaction quotient, Q, has reached a maximum.
E) the reaction quotient, Q, has reached a minimum.