A reactant
A substance that undergoes change in a chemical reaction is called a reactant.
Burning is an oxidation reaction - a reaction with oxygen.
This substance is called the end-product of a chemical reaction.
An adverse reaction to a correct substance would be called an allergy.
The substances you have at the beginning of a chemical reaction are called the reactants.
This is a chemical reaction.
A substance that undergoes change in a chemical reaction is called a reactant. Reactants are the starting materials in a chemical reaction that are transformed into products through the rearrangement of atoms.
The substance that is created is called a product.
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.
The substance formed as a result of a chemical reaction is called a product. It is the result of the reaction between the reactants, which undergo a chemical transformation to form one or more products.
The substances that enter into a reaction are called reactants.
The reaction is called oxidation.