Question

what is chemical reaction​

Answer 1

Chemical reaction is the reaction between two or more elements.
For example: 2H2 + O2 ---> 2H2O

Answer 2

Hi. Hope you are fine.

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

For example, iron (Fe) and sulfur (S) combine to form iron sulfide (FeS).

Fe(s) + S(s) → FeS(s)