CHEM 107 Lecture 3: CHEM 107 - Lecture 3
Document Summary
Chemistry is the study of matter, it"s properties, the change that matter undergoes, and the energy associated with those changes. Matter anything that has mass and takes up space. Contains only one type composed of two or of atom more different elements that are chemically combined. Element composed of only one kind of atom; cannot be decomposed into a simpler substance. Diatomic elements naturally exist as molecules of two atoms bound together. Molecule two or more atoms chemically bound together. Diatomic elements cannot exist with only one molecule of the element, must be a pair. 7 diatomic elements: hydrogen, oxygen, nitrogen, fluorine, chlorine, bromine, iodine. Compound made up of two or more different elements; connected together. A compound is considered a molecule if it is covalently bonded (more on this later) Pure substance composed of only one kind of atom or compound. Mixture combination of 2 or more substances (elements or compounds)
