Now, for the catalyzed reaction, even though equilibrium will be reached much quicker because of a catalyst, the final concentrations are exactly the same. They have not changed. In other words, catalysts do not touch the equilibrium of our reaction. They affect the kinetics of our reaction, but they do not affect equilibrium. Now, we're going to examine the two types of catalysts. So we have heterogeneous catalysts are molecules that are in a different state compared to the reactants.