In dynamic equilibrium, which condition describes the movement of substances?

In a dynamic equilibrium, substances involved in a chemical reaction are continuously moving between reactants and products, with the rates of the forward and reverse reactions being equal. This means that while individual molecules are still undergoing transformation from reactants to products and vice versa, the overall concentrations of reactants and products remain constant over time.

This state of equilibrium does not imply that the reaction has stopped; rather, the ongoing processes are balanced. Thus, the correct characterization of movement in dynamic equilibrium is that substances move between reactants and products at equal rates, maintaining a consistent concentration of each throughout the system. This concept is foundational in understanding chemical reactions and the principles behind equilibrium in chemical systems.