Elements, Compounds, and Mixtures January 12 th and 13 th

Determine if they are physical or chemical properties Blue Color Physical

Density Physical

Flammability Chemical

Solubility Physical

Reacts with Acid Chemical

Sour Taste Physical

Melting Point Physical

Boiling Point Physical

Odor Physical

Rusting Chemical

Evaporation Physical

Ice Melting Physical

Milk Souring Chemical

Wood Rotting Chemical

Pancakes cooking on a griddle Chemical

Grass growing from seed Chemical

A tire is inflated with air Physical

Water is absorbed by a paper towel Physical

Main Categories of Matter  Pure Substances  Elements  Compounds  Mixtures  Homogeneous  Heterogeneous

Pure Substances  Definition- Have the same composition throughout. Most occur naturally.  Elements  Compounds

Elements  Cannot be separated into a simpler substance by physical or chemical changes.  Have unique characteristics, such as boiling point or density.

Compounds  Are created when two or more different elements combine chemically.  Cannot be broken down by physical changes, but can be broken down by chemical means.  The compound does not retain the properties of the components that formed it.

Mixtures  Forms when two or more substances are physically combined. They can be physically separated.  Homogeneous  Heterogeneous

Homogeneous  The parts are evenly distributed and looks the SAME throughout

Heterogeneous  The parts are not evenly distributed and look DIFFERENT throughout.