Concept:Chemical equilibrium is a dynamic balance where the forward and reverse reactions occur at the same rate, causing no visible change in concentration.
Explanation:When equilibrium is reached, the reactants and products continue to react, but their amounts stop changing with time.
This happens because the rate of the forward reaction becomes exactly equal to the rate of the reverse reaction.
As a result, the concentrations of both reactants and products remain steady and constant.
Equilibrium does not mean that all reactants are used up, nor does it mean the reaction has gone to completion.
Also, the concentrations of reactants and products do not have to be equal to each other; only their values become fixed.
Therefore, the only correct statement is that concentrations stay unchanged.
Answer:C. The concentration of reactants and products remain constant