# Chemistry --- **Chemistry** is the study of [[matter]] and [[substance|substances]], and how they interact with one another. It is important to understand for [[nursing]] because understanding it is essential to the understanding of [[biology]]. Everything is made up of [[atom|atoms]]; they are the smallest "building block" of matter. A substance that is made up entirely of one type of atom is a pure [[element]]. Some atoms can come together to form [[molecule|molecules]]. Sometimes molecules or atoms react when they are brought together in [[chemical reaction|chemical reactions]]. ## Biochemistry [[Biology]] is really [[xkcd 435.png|just applied chemistry]]. Every biological reaction is, at it's core, a [[chemical reaction]]. Tons and tons of them happen all day, every day, in every living being. ___