Explain the roles of products, reactants, and limiting reactant in a chemical reaction.

Products and reactants are substances. The first one (the products) are obtained when the reactants are changed. The process of change of one element into another is called chemical reaction. The reactants are transformed during the chemical reaction into products. Limiting reactant is the reactant which defines the amount of product as a a result of the reaction. This reactant is also called limiting reagent.