Question

What is Chemistry, their reaction​

Answer 1

Answer:

The branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

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Answer 2

Answer:

Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy.

and

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.