Final answer:
Enzymes hasten the achievement of equilibrium in chemical reactions but do not alter the equilibrium concentrations of reactants and products, thus maintaining the reaction balance.
Step-by-step explanation:
The effect of an enzyme on the end equilibrium concentration of reactants and products:
An enzyme does not change the end equilibrium concentrations of reactants and products in a reaction, but it accelerates the rate at which equilibrium is reached. Enzymes are biological catalysts that increase the rate of chemical reactions without being consumed or altering the final equilibrium state of the reaction.
Applying this to enzymatic reactions, when we increase the concentration of the substrate, the rate of the reaction may increase initially but will level off when the enzyme becomes saturated. Upon reaching equilibrium, the concentrations of reactants and products will remain constant, and the value of the reaction quotient (Qc) will also remain stable, reflecting the particular ratio of product to reactant concentrations determined by the reaction's equilibrium constant (Kc).