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
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
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.
The diagram shows an experiment where hydrogen gas reacts with copper oxide.
Which are the two products of this reaction?
This question is about obtaining metals.
Rocks from which metals can be extracted economically
are called . . .
2 fossil fuels.
4 sedimentary rocks.
Aluminium is extracted from aluminium oxide by
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.
The diagram shows a blast furnace.
Match words from the list with the labels 1– 4 on the diagram.
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.
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.
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
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.