I'm taking online classes I need to know,

what is chemistry?

its sorta like science but not quite. You learn more about matter, its properties, and what reactions substances have when combining some together

Besides a pain to study and ace it's tests, it is the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.