Water AQA

River water is filtered then sterilised to make drinking water. Why is it filtered?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

River water is filtered then sterilised to make drinking water. Why is it sterilised?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

Why is distilling sea water to make drinking water expensive?

• uses a lot of chemicals
• it's slow
• needs expensive equipment
• takes lots of time
• takes a lot of energy

How is distilled water different to sea water?

• it's a mixture
• it's a formulation
• it boils at 100 degrees C
• it freezes over a range of temperatures
• it is more salty

Which of these methods is not used for sterilising water?

• UV

• chlorine

• ozone

• filtering

How does UV sterilise water?

• mutates DNA to stop replication
• produces chlorine
• gets rid of salt
• filters out solids

Give a difference between pure and potable water?

• Pure water is suitable for drinking
• Potable water contains dissolves solids & chlorine
• Pure water contains dissolved solids & chlorine
• Potable water is not safe to drink

Which is a method of making water potable

• Anaerobic digestion

• Cracking

• Electrolysis

• Phytomining

• Desalination

Give the four aspects of sewage treatment used:

• Screening

• Anaerobic digestion

• Aerobic digestion

• Sedimentation

• Purification

Give two ways in which sea water can be turned into potable water through desalination

• UV light

• Distilling

• Reverse osmosis

• Chlorine

• Ozone