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Metals - Problems of Extraction
Recycling titanium would increase if more uses of titanium were found.

Metals - Problems of Extraction

This Chemistry quiz is called 'Metals - Problems of Extraction' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.

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In this high school Chemistry quiz, one in a series on the subject of metals, we look at some of the problems associated with the extraction of metals from their ores, such as the financial and the environmental costs.

1.
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
Even with the costs of transport, recycling usually requires less energy than starting from an ore which requires a lot of treatment and transport before it can reach the same point as the metal being recycled
2.
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
Bacteria live in the copper ore and break down the copper compounds. They produce acidic solutions which dissolve the copper compounds and these can be collected
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
Recycling won't bring back the area destroyed by the mining but it will slow down the amount of damage being done
4.
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
Bioleaching takes longer than traditional mining as you have to wait for the bacteria to 'do its thing'
5.
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
Electrolysis uses huge amounts of electrical energy. Generating this electricity has an effect on the environment as well as the extraction process
6.
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
To extract iron from haematite requires iron to be heated with carbon. This uses huge amounts of energy and requires other resources to be mined (limestone and coal)
7.
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
It is better to crush cans for recycling as it means that more can be transported in fewer journeys, saving more energy
8.
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
Mining does not release CFCs, which are the leading contributor to damage of the ozone layer
9.
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
There would be more of an incentive to recycle
10.
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
The deposits of aluminum ore are a finite resource, i.e. they will run out eventually
Author:  Kate Gardiner

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