MATTER Definition: Anything that contains mass and occupies space (volume.)

Classification of Matter Elements Draw this chart!, leave space to define the terms Pure Substances Compounds Matter Homogeneous Mixtures Heterogeneous

Mixtures and Pure Substances A pure substance is made of only one kind of material and has definite properties. Matter that consists of two or more substances mixed together but not chemically combined is called a mixture.

Pure Substances: Elements are the simplest pure substance. Examples: hydrogen, carbon, and oxygen. The smallest particle of an element that has the properties of that element is called an atom.

Pure substances: Compounds are pure substances that are made of more than one element bound together. Examples: water (H2O), and carbon dioxide. A molecule (or a Formula Unit) is formed when two or more atoms combine. Example: water (H2O), O2

MIXTURES Heterogeneous vs. Homogeneous Homogeneous matter (solutions): matter that has identical properties throughout. Examples: Salt water, and whipped cream Heterogeneous matter: matter that has parts with different properties. Examples: granite, soil, potpourri

EXAMPLES What type of matter are each of the following… ?

SAND

SAND Heterogeneous mixture

Salt (NaCl)

Salt (NaCl) COMPOUND

Air

Air Homogeneous mixture of: Nitrogen, N2 78.08% Oxygen, O2 20.95% Argon, Ar 0.93% Carbon dioxide, CO2 0.033% Neon, Ne 0.0018% Helium, He 0.00052% Methane, CH4 0.0002% Krypton, Kr 0.00011% Nitrogen(I) oxide, N2O 0.00005% Hydrogen, H2 0.00005% Xenon, Xe 0.0000087% Ozone, O3 0.000001% Homogeneous mixture of: Many gases make up mixture, but it looks like it is all one gas.

Gold

Gold ELEMENT: Au

Bronze

Bronze Homogeneous mixture of copper and tin (alloy: mixture of metals)

Salad Dressing

Salad Dressing: Heterogeneous