<P> The substance ( or substances ) initially involved in a chemical reaction are called reactants or reagents . Chemical reactions are usually characterized by a chemical change , and they yield one or more products , which usually have properties different from the reactants . Reactions often consist of a sequence of individual sub-steps , the so - called elementary reactions , and the information on the precise course of action is part of the reaction mechanism . Chemical reactions are described with chemical equations , which symbolically present the starting materials , end products , and sometimes intermediate products and reaction conditions . </P>
<P> The substance ( or substances ) initially involved in a chemical reaction are called reactants or reagents . Chemical reactions are usually characterized by a chemical change , and they yield one or more products , which usually have properties different from the reactants . Reactions often consist of a sequence of individual sub-steps , the so - called elementary reactions , and the information on the precise course of action is part of the reaction mechanism . Chemical reactions are described with chemical equations , which symbolically present the starting materials , end products , and sometimes intermediate products and reaction conditions . </P>
the elements or compounds that go into a chemical reaction are
the elements or compounds that go into a chemical reaction are
reactants or reagents
reactants or reagents