Compounds Compound: a substance that contains two or more elements chemically combined. Often have different properties Examples: H2O, NaCl
Mixtures Can be separated physically. Example: salt water How: evaporation Compound =/= mixture!
What is a mineral? A mineral: 1. occurs naturally 2. is a solid 3. has a definite chemical composition (elements are combined in definite proportions) 4. its atoms are arranged in a pattern (CRYSTALS) 5. is inorganic (not formed by plants, animals, or other organisms)
Examples of minerals gold diamond quartz rock salt (halite) Each occurs naturally, is a solid, has a definite chemical composition, is arranged in a pattern, is inorganic