Define reactant and product.

Explanation

(i) A chemical reaction is a process in which some substances undergo bond breaking and are transformed into new substances by formation of new bonds.
(ii) The substances taking part in chemical reaction are called reactants, whereas the substances formed as a result of a chemical reaction by formation of new bonds are aclled products.
(iii) For example :
(a) Formation of carbon dioxide gas by combustion of coal in air is a chemical reaction. In this reaction Coal (carbon) and Oxygen (from air) are the reactants while carbon dioxide is the product.
` overset(C+O_(2))to to overset(CO_(3))to`
`underset("Sulphate")underset("Copper"(CuSO_(4))+ underset("Zinc")(Zn)to underset("sulphate")underset("Zinc")(ZnSO_(4))+underset("Copper")(Cu)`
In the above equation, copper sulphate and zinc are the reactants and zinc sulphate and copper are the products.