What does dynamic equilibrium indicate in chemical reactions?

Dynamic equilibrium in chemical reactions is a state where the rate of the forward reaction is equal to the rate of the reverse reaction. This balance means that the concentrations of reactants and products remain constant over time. Although individual molecules are still reacting, their concentrations do not change because the system is in a state of balance.

This contrasts with the idea that all reactants are fully converted to products, which does not accurately describe dynamic equilibrium. Additionally, the concept does not limit reactions to occur solely at high temperatures; reactions can achieve equilibrium at various temperatures. Lastly, while there may be constant activity on a molecular level, the overall concentrations of reactants and products remain stable, contrary to the choice that suggests they change constantly.

Therefore, the correct choice reflects the definition of dynamic equilibrium and highlights the significance of equal reaction rates in maintaining a stable state in a chemical system.