Homogeneous catalysis heterogeneous catalysis is the petrochemical alkylation process, where the liquid reactants are immiscible with a solution containing the catalyst. Heterogeneous catalysis offers the advantage that products are readily separated from the catalyst, and heterogeneous catalysts are often more stable and degrade much slower than homogeneous catalysts. However, heterogeneous catalysts are difficult to study, so their reaction mechanisms are often unknown. Enzymes possess properties of both homogeneous and heterogeneous catalysts. As such, they are usually regarded as a third, separate category of catalyst. Homogeneous catalysis In chemistry, homogeneous catalysis is catalysis in a solution by a soluble catalyst. Homogeneous catalysis refers
Who is a Jew? in Jewish congregations. A person with one or two grandparents enrolled in a Jewish congregation could be classified as "Mischling", a crossbreed, of "mixed blood", if they were not a member of a Jewish congregation at the time the Nuremberg Laws were enacted. Only people with at least two of their grandparents of "German blood" could be German Reich's citizens, other Germans dropped into the new second class group of citizens, the so-called state citizens. If a person, with grandparents of the same religious combination, was enrolled as a member of a Jewish congregation in 1935 or would join later,