Matter
anything that has mass and takes up space
Atom
small particle that is a building block of matter
Substance
matter with a composition that is always the same
Elements
substance that contains only one type of atom
Compound
type of substance that contains atoms of two or more different elements chemically bonded together
Chemical formula
combination of symbols and numbers that represents a compound
Mixture
matter that can vary in composition
Heterogeneous mixture
individual substances are not evenly mixed
Homogeneous mixture
individual substances are evenly mixed