What is chemistry and what types of questions do chemists try to answer

Chemistry 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.

They answer questions like,  like "What makes up this material?," "How does this material change when heated or cooled,?" What happens when I mix this material with another material,?" and "What rules determine how materials change in different situations?" What makes up Chemical X?

ok whats the question if not i cannot you i need question and need a thing to answer

yes the answer is total mass in unchanged   : )