Metal extraction
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Metal Extraction. Question 1. Most metals are extracted from naturally occurring compounds called ores, which are mined from the ground. Iron can be extracted from its ore by heating it with carbon because . . . 1 Iron reacts with carbon to form steel

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Metal Extraction

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Metal extraction

Metal Extraction


Question 1

Question 1

Most metals are extracted from naturally occurring compounds called

ores, which are mined from the ground.

Iron can be extracted from its ore by heating it with carbon because . . .

1 Iron reacts with carbon to form steel

2 Iron is a more reactive element than carbon

3 Carbon produces a lot of heat when it burns

4 Carbon is a more reactive element that iron


Question 2

Question 2

It is important to recycle metals because . . .

1 Recycled metals have superior properties.

2 Recycling uses less energy and pollutes less than extracting metals.

3 Recycling does not contribute to global warming.

4 Metals extracted from their ores are too soft for most uses.


Question 3

Question 3

The diagram shows an experiment where hydrogen gas reacts with copper oxide.

Which are the two products of this reaction?

copper

copper hydroxide

copper sulphate

oxygen

water


Question 4

Question 4

This question is about obtaining metals.

Rocks from which metals can be extracted economically

are called . . .

1 alloys.

2 fossil fuels.

3 ores.

4 sedimentary rocks.


Question 5

Question 5

Aluminium is extracted from aluminium oxide by

electrolysis.

One reason why the process is expensive is that . . .

1 aluminium cannot be recycled.

2 aluminium has a low density.

3 aluminium is very easily corroded.

4 electrolysis uses a large quantity of energy.


Question 6

Question 6

The diagram shows a blast furnace.

Match words from the list with the labels 1– 4 on the diagram.

iron ore

molten iron

slag

waste gases


Question 7

Question 7

Bauxite, an ore containing aluminium, is very abundant.

Aluminium is more expensive to extract than iron because . . .

1 There is very little aluminium ore in the Earth.

2 The process of extracting aluminium from its ore requires more energy.

3 Iron occurs naturally as an element and requires no energy to extract.

4 Aluminium cannot be recycled.


Question 8

Question 8

Copper can be extracted from its ore by reduction with carbon.

The product of this is often further processed by electrolysis

because . . .

1 Reduction by carbon alone produces very impure copper.

2 Electrolysis uses very little energy and so is a cheaper method.

3 Carbon is too expensive to use commercially.

4 The world’s supply of carbon has nearly run out.


Question 9

Question 9

This question is about iron.

Choose from the list the two statements that are correct.

haematite contains an oxide of iron

in the blast furnace, iron oxide is reduced by limestone

iron can be extracted from haematite

iron does not react with oxygen or water

iron is in Group 2 of the periodic table


Question 10

Question 10

A blast furnace is operated continuously, sometimes for

several years, without a break.

One reason for this is . . .

1 to improve the quality of the iron.

2 to keep down the cost of the energy used.

3 so that large stockpiles of ore do not accumulate.

4 so that less waste slag is produced.


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