Part 1: Classification of matter
by TLPSES HKIEd
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. mixture
2.1. Definition
2.1.1. A mixture is two or more substances that are mixed together but not chemically joined
2.2. Examples
2.2.1. mixture of iron and sulphur
3. compound
3.1. Definition
3.1.1. A compound is formed when two or more elements are chemically joined
3.2. Examples
3.2.1. Iron (II) sulphide
3.2.2. Water
3.2.3. Sodium chloride