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WEEK: 8
TOPIC: PROPERTIES OF MATERIALS (CONTD.) – METALS
SUB-TOPICS:
- Identification of Metals by Physical Properties
- Classification of Metals
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
Sub-Topic 1: Identification of Metals by Physical Properties
Identification of metals can be defined as method used to differentiate one particular type of metal from another and from other materials which are non-metals.
Metals can be identified through their properties.
- Density – This is the weight of a metal and it varies from metal to metal. E.g., aluminium is light and lead is heavy in weight.
- Colour/Lustre– This is the appearance of a metal when the surface is polished. For example, when polished and examined under a microscope, copper presents a different appearance from polished mild steel.
- Fusibility – This is the property of a metal which makes it melt and join with other metals while in a liquid form.
- Magnetic property – This is property that if a metal possesses it, it is attracted by a magnet. It is used to identify ferrous metals from non-ferrous metals. A magnet will attract ferrous metal while non-ferrous metals will not be attracted by a magnet.
- Elasticity or Stretching – This is the elastic property of a metal i.e., ability to stretch
- Brittleness – When a metal breaks suddenly or cracks easily, then it is said to possess brittleness e.g., glass.
Other properties of metals are hardness, malleability and tenacity.
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