Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
Enzymes are macromolecular biological catalysts.
Isomerases are a general class of enzymes which convert a molecule from one isomer to another.
Products are the species formed from chemical reactions.
In chemistry, a substrate is typically the chemical species being observed in a chemical reaction, which reacts with reagent to generate a product.