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Metal Processing

basic technology (Secondary School)

Metal Alloys

An alloy is a material made by melting one or more metals together with other elements. This is an alphabetical list of alloys grouped according to the base metal of the alloy. Some alloys are listed under more than one element, since the composition of the alloy may vary such that one element is present in a higher concentration than the others.

ALUMINUM ALLOYS

 

Properties of metals

Metals: Non-metals:
Strong Brittle
Malleable and ductile Brittle
React with oxygen to form basic oxides React with oxygen to form acidic oxides
Sonorous Dull sound when hit with hammer
High melting and boiling points Low melting and boiling points
Good conductors of electricity Poor conductors of electricity
Good conductors of heat Poor conductors of heat
Mainly solids at room temp. Exception mercury – liquid at room temp. Solids, liquids and gases at room.temp.
Shiny when polished Dull looking
When they form ions, the ions are positive When they form ions, the ions are negative – except hydrogen that forms a positive ion, H+.
High density Low density

 

Common Metals and Non-Metals

Metals: Non-metals:
Calcium Sulphur
Potassium Oxygen
Lead Chlorine
Copper Hydrogen
Aluminium Bromine
Zinc Nitrogen
Lithium Helium

 

Uses of metals and non-metals

Metals

The uses of metals are related to their properties:

They are made into jewellery due to their hard and shiny appearance.

They are used to make pans, since they are good conductors of heat.

They are used in electrical cables, because they are malleable, ductile and good conductors of electricity.

They are strong so used to build scaffolding and bridges.

They make a ringing sound, sonorous, hence their use in bell making.

Non-metals

Used as insulating material around wire cables since they do not conduct electricity.

Used to make pan handles as they are poor conductors of heat.

Question:

1.     describe 5 properties of metals

2.     state 5 uses of  metals

See also

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Processing Wood

Processing of Wood

Carrier opportunities in technology

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