Final answer:
A small Keq indicates few products are formed, while a large Keq indicates that more products are present at equilibrium compared to reactants.
Step-by-step explanation:
If Keq is very small, it indicates that at equilibrium the concentration of reactants is far greater than the concentration of products, suggesting the reaction has limited progress and results in minimal product formation. Conversely, a large Keq suggests that the concentration of products at equilibrium is much greater than that of reactants, implying the reaction proceeds effectively to form products. For instance, if Keq is less than 0.001, it's considered small and will primarily consist of reactants. If Keq is greater than 1000, the equilibrium will consist mostly of products. When Keq is between 0.001 and 1000, there will be substantial amounts of both reactants and products present.