Part 1: Classification of matter

1. element

1.1. Definition

1.1.1. An element is a pure chemical substance and cannot be separated into simpler substances.

1.2. Examples

1.2.1. Iron (Fe)

1.2.2. Sulphur (S)

1.2.3. Copper (Cu)

2. compound

2.1. Definition

2.1.1. A compound is formed when two or more elements are chemically joined

2.2. Examples

2.2.1. Iron (II) sulphide

2.2.2. Water

2.2.3. Sodium chloride

3. mixture

3.1. Definition

3.1.1. A mixture is two or more substances that are mixed together but not chemically joined

3.2. Examples

3.2.1. mixture of iron and sulphur