Q.1
Economically, it is more sensible to recycle aluminum, because extracting it from its ore...
  • uses much larger amounts of energy
  • is a relatively cheap process
  • employs more people
  • takes a long time
Q.2
Which of the following is a disadvantage of bioleaching rather than extracting copper by the traditional method?
  • Bioleaching is more economical
  • Bioleaching is slower
  • Bioleaching uses less energy
  • Bioleaching allows us to use low-grade ores
Q.3
It is better to recycle aluminum than to extract it from aluminum ore because...
  • aluminium ore produces only low grade aluminum
  • aluminium ore doesn't contain many impurities
  • mining for aluminum ore destroys the local environment
  • recycling of aluminum produces ‘smart’ aluminum alloys
Q.4
A disadvantage of extracting aluminum from aluminum ore is...
  • aluminium ore is a limited resource
  • aluminium ore contains very small amounts of aluminum
  • the aluminum obtained corrodes easily
  • the aluminum obtained has a high density
Q.5
Scientists have been looking for alternative methods to extract copper from the ground. One of these methods is bioleaching. What does bioleaching use to extract copper?
  • Plants
  • Bacteria
  • Animals
  • Viruses
Q.6
If aluminum cans are not recycled, they can have a huge impact on the environment in which of the following ways?
  • They produce poisonous gasses
  • They cause acid rain
  • They fill up landfill rubbish tips
  • They corrode rapidly in lakes and rivers
Q.7
Most titanium is extracted from titanium oxide ore. The oxide is first converted to titanium chloride. The titanium chloride is then reacted with sodium. This method of extracting titanium is very expensive. Recycling titanium would increase if...
  • the cost of sodium were to fall
  • new high-grade deposits of titanium oxide were discovered
  • the cost of titanium were to fall
  • more uses of titanium were found
Q.8
Some iron is obtained by recycling scrap iron. Why does it take less energy to make iron from scrap iron than to extract the iron from its ore?
  • Scrap iron does not have to be reduced using carbon
  • Scrap iron contains the element sulfur
  • Scrap iron is an alloy
  • Corrosion of the scrap iron makes it easier to melt
Q.9
Recycling metals is often thought of as a better way to provide more metals. Which of the following is NOT an advantage of recycling?
  • Destruction of habitats
  • Preserves natural resources
  • Decreases landfill space required
  • It is cheaper than extraction from the ore
Q.10
Removing metal ores from the ground usually involves mining. Which of the following is NOT an environmental impact of mining?
  • Loss of habitat
  • Increase in global warming
  • Damage to the ozone layer
  • Noise pollution
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