Homogenous and heterogenous?

Answer:
This question is too vague. However, I would assume that you are talking about catalysis. Homogenous catalyst is when all products, reactants and the catalysts are in the same phase. Heterogenous catalysis is when either products, reactants or catalysts are in different phases.
First answer by Tonoius. Last edit by Tonoius. Contributor trust: 4 [recommend contributor recommended]. Question popularity: 1 [recommend question].