1
Q
Name properties of ceramics
A
Insulators, brittle, stiff
2
Q
Name properties of polymers
A
Insulators, flexible, easily moulded
3
Q
Name properties of metals
A
Malleable, conductors, ductile, shiny, stiff
4
Q
What are alloys
A
Where another metal is added to a metal which makes the alloy harder than the pure metal
5
Q
What is rusting
A
The corrosion of iron or steel
6
Q
What is corrosion
A
Where a metal reacts with the environment and is gradually destroyed
7
Q
What is necessary for iron to rust
A
Air and water
8
Q
How do you prevent rusting
A
- Painting/coating
- Electroplating
- Oiling
- Sacrificial layer
- Galvanisation
9
Q
A
10
Q
What is potable water
A
Water that has been treated or is naturally safe to drink
11
Q
How do you make potable water from freshwater
A
- Filtration (through a wire mesh then sand and gravel)
- Sterilisation ( via chlorine or ozone)
12
Q
How do you desalinate water
A
Distillation
13
Q
How do you treat waste water
A
- Screening ( removes large materials)
- Sedimentation ( heavy solids sink to the bottom and produce sludge)
- Digestion (aerobic bacteria break down organic matter)
- Anaerobic digestion ( sludge is broken down to produce methane)
