They are generally known as substrates.
The substances you have at the beginning of a chemical reaction are the reactants or the reagents.
Reactants are the substances that are present at the start of a chemical reaction and are consumed during the reaction. Products are the substances that are formed as a result of the chemical reaction.
Reactants are the starting materials of a reaction. Reactants combine to form the products.
You can determine if a reaction is stoichiometric by comparing the balanced chemical equation to the actual amounts of reactants and products in the reaction. If the amounts of reactants and products are in the exact ratios as predicted by the balanced equation, then the reaction is stoichiometric.
The reactants
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Reactants are added into the equation to form the chemical reaction. Reactants are substances that are changed into products. Without these reactants, there would be no formula, resulting in no product.
The reactants in the reaction are A and B.
Reactants
If you know know the molar masses of the reactants in a chemical reaction you can determine the molar masses of the products because the combined molar masses of the reactants equals the combined molar masses of the products.
Reactants are the substances present at the beginning of a chemical reaction. They are consumed during the reaction to yield products. Reactants typically undergo a transformation in their chemical structure or properties during the reaction.
The reactants exist before a reaction begins, and also the products are the result of the reaction of the reactants.