The new substances produced in a reaction are called as

Chemical changes, such as the formation or breaking of bonds between various atoms or molecules, are what is referred to as reactions. Chemical equations are created when a reaction is stated using symbols and formulas. Chemical reactions include the transformation of reactants, which are elements or compounds, into products, which are compounds or elements. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

During a chemical reaction, the substances that are reacting are called reactants and the new substances that are produced are called products.

A catalyst is a substance that is used to speed up a chemical reaction.

Hence, the correct option is A.