In either case, the material creates new,  faster steps in the reaction mechanism.
The homogenous variety often consists of the reaction, the product, and this material  in the liquid phase, while "heterogeneous" usually signifies that it is a solid and  reactants and products are liquids or gases. In either case, the material creates new,  faster steps in the reaction mechanism. A common example of this material is a  protein that lowers the EA [Big E sub Big A] of metabolic processes. FTP, name this  foreign material, an example of which is the enzyme, which speeds up chemical  reactions.
The homogenous variety often consists of the reaction, the product, and this material  in the liquid phase, while "heterogeneous" usually signifies that it is a solid and  reactants and products are liquids or gases.
Catalysts