Which is a property of a reaction that has reached equilibrium?
A. The amount of products is equal to the amount of reactants.
B. The amount of products is greater than the amount of reactants.
C. The rate of the forward reaction is greater than the rate of the reverse reaction.
D. The rate of the forward reaction is equal to than the rate of the reverse reaction.
Equilibrium means equal reaction rates. Choices 2 and 3 are "greater than", not "equal to" and choice #1 does not mention reaction rates. Only choice 4 states "equal reaction rates." A system in equilibrium can have unequal amounts of product and reactants; or it could have equal amounts of product and reactants. Equal reaction rates, however, are necessary for dynamic equilibrium to result.