Final answer:
Chemical equilibrium occurs when the rates of the forward and reverse reactions are equal, resulting in no net change in reactant and product concentrations, a dynamic state referred to as dynamic equilibrium.
Step-by-step explanation:
The correct answer is (D) opposing reactions attaining equal speeds. Chemical equilibrium is the result of both the forward and reverse reactions in a chemical process happening at the same rate. In this state, there is no net change in the concentrations of reactants and products over time, although both reactions continue to occur. This is known as a dynamic equilibrium.
It is essential to understand that reaching equilibrium does not mean that reactants and products are equal in mass, nor does it imply that the reaction has stopped or that reactants are no longer available; it simply means that the forward and reverse reactions are balanced.