The reactants
A substance that lowers the energy needed to start a chemical reaction is a catalyst.
The substance present at the start of a chemical reaction is called a reactant. Reactants are the starting materials that undergo chemical changes to form products during a reaction.
The reactant is the substance present at the start of a chemical reaction, while the product is the substance(s) formed from a chemical reaction.
This substance is a catalyst.
The reactants
A product is a substance that is formed by a chemical reaction.
This substance is called the end-product of a chemical reaction.
Anew substance that is formed is a product in a chemical reaction
Anew substance that is formed is a product in a chemical reaction
This is a chemical reaction described by a chemical reaction.
Substances initially present in a chemical reaction that are consumed during the reaction or a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction while the end product of some chemical reactions yield products.
A substance that undergoes change in a chemical reaction is called a reactant.