Matter

1. Pure Substances

1.1. A material that consists of only one type of atom, molecule or compound.

1.1.1. Compound

1.1.1.1. A substance that forms when two or more elements combine.

1.1.1.1.1. Crystal

1.1.1.1.2. Molecule

1.1.1.2. Example: Water/H2O which consist of hydrogen and oxygen.

1.1.2. Element

1.1.2.1. A pure substance that consists of only atoms that have the same number of proteins in their nuclei. Unlike compounds they cannot be broken down.

1.1.2.2. Example: Oxygen

1.1.2.3. Atom

1.1.2.3.1. The basic unit of a chemical element.

2. A substance that ocupies space and contains mass: everything is matter, air, gas, water, fire, metal, etc.

3. Mixture

3.1. A substance that is made by mixing other substances together .

3.1.1. Homogeneous

3.1.1.1. A mixture with the same uniform appearance.

3.1.1.1.1. Solution

3.1.1.1.2. Colloid

3.1.1.2. Example: Coffee and Milk

3.1.2. Heterogeneous

3.1.2.1. A mixture that has visible difference in substance.

3.1.2.1.1. Suspension

3.1.2.2. Example: Oil and water