Dynamic equilibrium: equal opposing rates

Steps:

• Define dynamic equilibrium as the state where forward and reverse reaction rates are identical.
• Confirm this balance prevents net production or consumption of species.
• Verify that constant concentrations follow from rate equality.
• Assess each statement against this definition to identify the core truth.

Why A is correct:

• It states the kinetic definition of dynamic equilibrium, where rate_forward = rate_reverse, ensuring no net reaction progress.

Why the others are wrong:

• B: Describes a macroscopic observation but overlooks that individual reactant/product molecules continue interconverting.
• C: Measurable properties like concentrations are constant, but microscopic changes (e.g., molecular collisions) persist, making the statement overly absolute.
• D: Not enough information.

Final answer: A