1. Classification of Matter Matter – anything that has mass and takes up space Pure Substance - matter that CANNOT be physically separated Compound – made up of TWO or MORE elements Element – matter made of only ONE kind of atom

2. Mixture – matter that CAN be physically separated and contains TWO OR MORE substances Homogeneous (solution) – uniform composition or substances evenly mixed Heterogeneous – substance not evenly mixed Colloid – particles do not settle Suspension – particles do settle, particles are spread out but do not dissolve

4. Solution = mixture that dissolves and is spread out evenly 2 PARTS OF A SOLUTION Solute – the part that dissolves Solvent – the substance that dissolves the solute (the larger part of the solution) example of a solution: salt water the salt is the solute the water is the solvent (water is sometimes called the universal solvent)

5. Types of solutions Liquid solutions ex: vinegar pop (CO 2 gas in the liquid) * cold pop holds more CO 2 than warm pop Gaseous solutions ex: air (oxygen dissolved in nitrogen) Solid solutions ex: bronze (copper and tin) brass (copper and zinc) steel (iron and carbon) Solubility – the ability of a substance to dissolve in another substance. Hot tea will dissolve more sugar than cold tea. Cold soda will dissolve more carbon dioxide gas than warm soda.

6. Soluble – when one substance (solute) is dissolved by another substance (solvent) “like dissolves like” example: salt is soluble in water Insoluble – when one substance does NOT dissolve in another example: oil is insoluble in water