This document discusses pseudo-order kinetics. It defines pseudo-order as occurring when one reactant is present in excess, making its concentration appear constant and effectively zero-order. This can turn an overall second-order reaction into an apparent first-order reaction. Continuous experiments can also show pseudo-order kinetics if one reactant is isolated. The half-life of a pseudo-first-order reaction depends on the concentration of the excess reactant, unlike a true first-order reaction.