Final answer:
A system at chemical equilibrium is when the rates of the forward and reverse reactions are equal, and the concentrations of reactants and products are constant. It is a dynamic process where reactions are still occurring in both directions, but there is no net change in concentrations.
Step-by-step explanation:
A system at chemical equilibrium is when the rates of the forward and reverse reactions are equal. This means that the concentrations of reactants and products in the system are not changing or are constant. Chemical equilibrium is a dynamic process, where reactions are still occurring in both directions, but there is no net change in the concentrations. The amounts of reactants and products do not have to be equal, but the concentrations remain constant.