<P> In chemistry, a substrate is typically the chemical species being observed in a chemical reaction, which is organic in nature and reacts with a reagent to generate a product . In synthetic and organic chemistry, the substrate is the chemical of interest that is being modified . In biochemistry, an enzyme substrate is the material upon which an enzyme acts . When referring to Le Chatelier's principle, the substrate is the reagent whose concentration is changed . The term substrate is highly context - dependent . </P> <Table> <Tr> <Td> <P> Spontaneous reaction </P> <Dl> <Dd> S ⟶ P (\ displaystyle (\ ce (S -> P))) </Dd> </Dl> <Ul> <Li> Where S is substrate and P is product . </Li> </Ul> </Td> <Td> <P> Catalysed reaction </P> <Dl> <Dd> S + C ⟶ P + C (\ displaystyle (\ ce ((S) + C -> (P) + C))) </Dd> </Dl> <Ul> <Li> Where S is substrate, P is product and C is catalyst . </Li> </Ul> </Td> </Tr> </Table>

What is a substrate in a chemical reaction