Classification of Matter

Matter All Matter is made of atoms. Tiny particles Think of letters Each letter is unique, and can be arranged to form different words Ex: A, F, C, T – Fact, Tac, Fat, Cat, etc.

Pure Substances Element composed of identical atoms EX: copper wire, aluminum foil

Pure Substances Compound composed of 2 or more different elements in a fixed ratio properties differ from those of individual elements EX: table salt (NaCl)

Molecules Molecule Two or more atoms chemical bonded together Does not have to contain different atoms This means, all compounds are molecules, but not all molecules are compounds Ex: H2 (Hydrogen), O2 (Oxygen), N2 (Nitrogen)

Mixtures Variable combination of 2 or more pure substances. Heterogeneous Homogeneous

Mixtures Solution homogeneous very small particles particles don’t settle EX: rubbing alcohol

Mixtures Heterogeneous medium-sized to large- sized particles particles may or may not settle EX: milk, fresh-squeezed lemonade

Mixtures Examples: Answers: tea muddy water fog saltwater Italian salad dressing Answers: Solution Heterogeneous

Can it be physically separated? Matter Flowchart MATTER yes no Can it be physically separated? MIXTURE PURE SUBSTANCE Is the composition uniform? no yes Can it be chemically decomposed? no yes Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element

Matter Flowchart Examples: element hetero. mixture compound solution graphite pepper sugar (sucrose) paint soda element hetero. mixture compound solution