Topic 10 - Using recources:

Question 1

Renewable energy:

Answer 1

Sources of power that quickly replenish themesleves and can be used again

Question 2

Potable water:

Answer 2

Water that is safe to drink
* Potable water is NOT ‘pure’- it contains dissolved substances
* Methods used to produce potable water depend on available supplies of water and the location in the UK:
1. An appropriate source of fresh water is selected
2. Water is passed through filter beds- removes different sized insoluble substances
3. The water is then sterilised- kills microbes

Question 3

Desalination:

Answer 3

• Process of producing potable water
• Howevere, it is very expensive

Question 5

How correct quality water is produced:

Answer 5

It must be free of poisonous salts and harmful microbes at it is essential for life.

1. Water is passed through a mesh screen to remove large bits
2. Chemicals are added- makes solids and microbes stick together to form sediment
3. There is then anaerobic digestion of sewage sludge
4. The water is then sterilised with chlroine- kills microbes

Question 6

Alternative methods of extracting metals:

Answer 6

• The earth’s resource of metal ores are limited
• Copper ores are becoming scarce- there are now new ways of extracting copper from low grade ores including phytomining and bioleaching
• These methods avoid traditional mining methods of digging large amounts of rock

Question 7

Phytomining:

Answer 7

Uses plants to absorb metal compounds
* Plants are harvested
* Then burned
* This produces ash that contains the metal compounds
* The pure metal can be ecxtracted using electrolysis

Question 8

Bioleaching:

Answer 8

• Uses bacteria
• Produces leachate solutions
• Contains metal compounds
• The pure metal can then be obtained using electrolysis