Page 341 - Primary Six Notes

Why are alloys made?

 To make the metal harder

 To lower the melting point of the metal.

 To make the metal more resistant to corrosion i.e. wear and

tear

 To increase the electrical resistively of metals.

FUELS

A fuel is anything that burns to produce heat and light energy.

Examples of fuels; Fire wood, Charcoal, Oil (Petroleum),

Coal

 Fire wood and charcoal are renewable resources while oil

and coal are non-renewable resources.

 Coal was formed from marshy vegetables and plants which

lived long ago and were buried under ground but due to

heat and pressure they changed to coal.

 Coal is burnt to get thermal electricity.

 Oil (petroleum) is refined through the process of fractional

distillation.

 The products after refining crude oil (petroleum) are; Petrol,
diesel and kerosene.

 These products are burnt to produce heat and light.

 Petrol and diesel are used to run engines.

 Oil was formed from animals which lived long ago and were
buried due to heat and pressure they changed to oil.