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Matter anything that has mass and takes up spaces Pure Substance made of one kind of material and has a set of specific properties Element can not be broken down into other substances Example - oxygen , zinc Compound two more more elements held together by chemical bonds Ex - water, salt Mixture two or more substances not chemically combined Heterogeneous least mixed, not uniform throughout Ex. - salad, chexmix Suspension small particles in a liquid or a gas and they settle over time Ex. - salad dressing, sand and water Homogeneous well mixed, uniform throughout, particles do not settle Solution best mixed, one material dissolves Ex. koolaid, brass Colloid suspended particles, do not settle, scatters light Ex. - milk. glue