sustainable chemistry (topic 10) Flashcards
1
Q
calculate the energy required to make 4 kg of packaging from cardboard
A
2
Q
suggest two reasons why extracting copper by recycling is a more sustainable way of obtaining copper (2)
A
- conserves copper ores
- uses less energy (compared to extraction)
- reduces waste reduces landfill
- reduces the need for mining/quarrying
3
Q
suggest a reason why phytomining has not become a popular way of obtaining copper
A
- land not available
- takes a long time
4
Q
explain why aluminium cannot be extracted from its ore using carbon (2)
A
- aluminium is more reactive than carbon
- so aluminium cannot be reduced with carbon
5
Q
A
6
Q
give one advantage and one disadvantage of extracting aluminium by electrolysis on the industrial scale (4)
A
- technology already exists
- high grade aluminium is obtained with few impurities
~~~~~ - electrolysis requires a large amount of energy
- expensive process
- carbon dioxide is released which is a greenhouse gas
7
Q
aluminium oxide has the formula Al2O3, alculate the maximum mass of aluminium that can be obtained from 120 tonnes of aluminium oxide
A
8
Q
give two advantages of obtaining copper by recycling rather than mining the raw material and extracting copper from that raw material (2)
A
- conserves natural reserves of raw materials
- less damage to landscape
- less noise pollution
- less energy required to recycle
- less waste going to landfill
