The forward rate constant, kf, and reverse rate constant, kr, for a chemical reaction are not equal. Which of the following must be true?
a. The reaction will be unable to achieve equilibrium.
b. kf and kr will become equal as equilibrium is approached, owing to concentration changes.
c. kf and kr will become equal as equilibrium is approached, owing to temperature changes.
d. kf and kr will remain unequal but the rates will become equal, owing to concentration changes.
e. kf and kr will remain unequal but the rates will become equal, owing to temperature changes.
Answer: d. kf and kr will remain unequal but the rates will become equal, owing to concentration changes.