Identify which of the following statements are incorrect. If the statement is incorrect, rewrite it to be correct.
a. Reactions are faster at higher temperature because activation energies are lower.
b. Rates increase with increasing concentration of reactants because there are more collisions between reactant molecules.
c. At higher temperatures, a larger fraction of molecules have enough energy to get over the activation energy barrier.
d. Catalyzed and uncatalyzed reactions have identical mechanisms.