C14

Question 1

What is portable water?

Answer 1

• Water that is safe to drink.
• NOT pure water because it contains dissolved substances like certain mineral ions.

Question 2

What is pure water?

Answer 2

Contains only water molecules.

Question 3

How does water do from freshwater (ground water) to portable water (AFS)?

Answer 3

• Choose an appropriate source of fresh water.
• Pass the water through filter beds (made out of sand and gravel).
• Sterilising (using chlorine, ozone, UV light).

Question 4

What is freshwater?

Answer 4

• In the UK, rainwater provides low levels of dissolved substances (freshwater).
• This collects in lakes and rivers in the ground.

Question 5

How do we get portable water from seawater?

Answer 5

• If supplies of freshwater is limited, desalinisation of salty water may be needed.

Question 6

What is desalinisation? What could it require?

Answer 6

• Can be done by distillation or processes that use membranes such as reverse osmosis.
• These process require large amounts of energy.