3.
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When they reach the place they are to be recycled, how is recycling of metals carried out? |
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Metals are added to their molten ore |
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Metals are taken from pieces of waste recovered from spoil heaps |
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Metals are reduced using carbon and moulded into ingots |
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Metals are melted down and reshaped |
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4.
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Why is extracting iron from its ore so expensive compared to recycling it? |
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Iron ore has to be mined |
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The iron ore needs to be purified |
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Extraction requires chemical reactions to be carried out |
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All of the above |
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5.
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Apart from the costs associated with preparing the ore, which of the following is likely to make extracting aluminium expensive? |
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The cost of the staff needed to work in the factory |
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The cost of the electricity used during the electrolysis of the aluminium ore |
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The cost of the carbon required to displace the aluminium from its ore |
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The cost of casting the aluminium into ingots |
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6.
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Why is aluminium easy to recycle? |
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It is a shiny metal |
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It is a soft metal |
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It is mainly made into drinks cans |
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It has a relatively low melting point for a metal |
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7.
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Titanium is also an expensive metal. Only a small portion is ever recycled. Which of the following reasons is the most likely explanation? |
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It is usually used in small quantities to make alloys rather than using it on its own |
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It is only used to make small items and it is not worth it |
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It is a heavy metal and the cost of transporting it for recycling is too expensive |
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All of the above |
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8.
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Which of the following environmental issues could recycling metals reduce? |
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Air pollution in cities |
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Low level atmospheric ozone |
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Pollution of land and rivers |
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Cutting down of forests |
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9.
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Read the following information and then decide which of the four answers contains the missing words in the correct order.
Before any metals can be ________ the scrap metal has to be collected, ____________ and sorted, which all cost money. The main problem with recycling metals is ____________ the useful metal from the rest of the rubbish. In domestic recycling plants iron and steel objects can be picked out using an __________ as most other materials are non-magnetic. |
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transported, recycled, electromagnetism, separated |
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taken, melted, removing, electromagnet |
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recycled, transported, separating, electromagnet |
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recycled, stored, picking, brush |
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10.
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Why is the recycling of copper becoming more and more important? |
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The world's reserves of high grade copper ores are very limited and could be exhausted within a few human generations |
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Many copper manufacturers have gone out of business so not much is being made |
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It is a precious metal |
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New laws have made copper ore mining much more difficult |
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