Using Resources

Question 1

Finite

Answer 1

Limited amount

Question 2

Renewable

Answer 2

Replaced same as used up

Question 3

Cotton

Answer 3

Used for clothing
Polyester replaces it

Question 4

Wood

Answer 4

Used for construction material
PVC replaces it

Question 5

Potable water

Answer 5

Water that is safe for people to drink

Question 6

Desalination (distillation) advantages

Answer 6

Uses salt water which is in plentiful supply
Large volumes of water can be distilled

Question 7

Reservoir method

Answer 7

1. Source of water
2. Reservoir
3. Screening mesh this removed large sediment
4. Sedimentation
5. Passing untreated water through filter beds made of sand and gravel to remove solid particles
6. The addition of chlorine or ozone to sterilise the water by killing microorganisms or, without adding chemical sterilising agents by passing ultraviolet light through the water
7. Temporary storage of purified water

Question 8

Advantages of reservoir

Answer 8

Lots of potable water produced
Low set up cost

Question 9

Disadvantages of reservoir

Answer 9

Relies on the reservoir to be full.
Droughts can affect production

Question 10

Disadvantages of distillation

Answer 10

Lots of energy require for the process

Question 11

Advantages of reverse osmosis

Answer 11

Less energy required for the process

Question 12

Disadvantages of reverse osmosis

Answer 12

Pumps and parts need to be replaced

Question 13

How to treat sewage

Answer 13

Filtering the large solids
Sedimentation to produce sewage sludge (sinks) and effluent (floats)
Anaerobic digestion of solid sludge
Aerobic biological treatment of liquid effluent using bacteria

Question 14

Phytomining

Answer 14

Growing plants which contains copper
Plants are burnt to produce ash
The ash is dissolved in sulphuric acid to produce a solution of copper sulphate
The solution undergoes electrolysis to extract the copper

Question 15

Advantages of phytomining

Answer 15

Uses low grade copper ore
Requires less energy than smelting
Produces less air pollution
Reduces amount of waste rock

Question 16

Disadvantages of phytomining

Answer 16

Can produce toxic chemicals
Much slower process
Electrolysis requires large amounts of electricity

Question 17

Bioleaching

Answer 17

Uses bacteria
To produce solutions containing copper compound
From which copper is obtained by displacement

Question 18

Advantages of bioleaching

Answer 18

Simple process
Cheap process
Use low grade ores
Environmentally friendly

Question 19

Disadvantages of bioleaching

Answer 19

Slow process
Toxic chemicals are produced
Low efficiency