Key Stage 3 Science Book 3 Assessments
Obtaining Useful Materials (Orange level)
Answers
1. Which of these metals was the first to be extracted from an ore? [1 mark]
b)
Difficulty level: moderate
Skill level: knowledge
2. Which gas is produced when a metal carbonate is decomposed by heating? [1 mark]
d)
Difficulty level: moderate
Skill level: knowledge
3. Which of the following does not happen when magnesium is added to a solution of copper sulfate? [1
mark]
Difficulty level: moderate
Skill level: application
4. Why is limestone added to a blast furnace? [1 mark]
c)
Difficulty level: moderate
Skill level: knowledge
5. Copper pyrites contains copper sulfide. What must it be changed into before the copper can be
extracted using carbon? [1 mark]
b)
Difficulty level: moderate
Skill level: knowledge
6. Zinc sulfide is roasted in air to produce zinc oxide. Zinc is extracted by heating zinc oxide with carbon.
Which of the following is not produced during this process? [1 mark]
b)
Difficulty level: moderate
Skill level: application
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
7. Place the steps in order, 1-4, to describe what happens during a chemical reaction. [1 mark]
Particles of reactants collide
1
Bonds are broken
2
New bonds are made
3
Product is formed
4
Difficulty level: moderate
Skill level: knowledge
8. Place the steps in order, 1-4, to describe what happens during photosynthesis. [1 mark]
Green leaves absorb energy from the Sun
1
Bonds in carbon dioxide and water are broken
2
New but slightly weaker bonds are made
3
Glucose and oxygen are formed
4
Difficulty level: moderate
Skill level: application
9.Which two statements about catalysts are true? [1 mark]
c), d)
Difficulty level: moderate
Skill level: knowledge
10. Which two applications might ceramics be useful for? [1 mark]
a), c)
Difficulty level: moderate
Skill level: application
11. Why are refractory ceramics used to line kilns? [2 marks]
(the answer should contain the following)
1) They retain their strength at high temperatures
2) They resist corrosion and chemical attack
Difficulty level: moderate
Skill level: knowledge
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
12. Name two types of natural polymer found in plants. [2 marks]
(the answer should contain the following)
1) Proteins (also accept DNA as an answer)
2) Cellulose
Difficulty level: moderate
Skill level: knowledge
13. What is the relationship between crude oil and polythene? [2 marks]
(the answer should contain the following)
1) Polythene is made from ethene (its monomer)
2) Ethene is produced from crude oil
Difficulty level: moderate
Skill level: application
14. What are the raw materials needed to make concrete? [2 marks]
(the answer should contain two of the following)
1) Limestone is needed to make cement
2) Cement is mixed with sand, gravel and water to make concrete
Difficulty level: moderate
Skill level: knowledge
15. Tennis rackets used to be made of wood. Why are they are usually made of carbon fibre nowadays?
[2 marks]
(the answer should contain the following)
1) The rackets are stronger and lighter
2) They do not bend or warp over time
Difficulty level: difficult
Skill level: application
16. Why is the ease of thermal decomposition of metal carbonates important in metal extraction? [2
marks]
(the answer should contain the following)
1) Many metals exist as carbonate ores
2) Carbonate ores must be changed into metal oxides prior to extraction
Difficulty level: moderate
Skill level: evaluation
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
17. Precious metals are often recycled from discarded computers. The processes involve sorting and
separating, dissolving in suitable acids or other solutions, and electrolysis. What effect might this have
on the environment?
[4 marks]
(the answer should contain the following)
1) It avoids mining and processing ores needed to extract the metals, so preserve supplies
2) The chemicals used to dissolve and separate metals from other materials are likely to be hazardous
3) Electricity is needed for electrolysis and this has to be generated in power stations which may pollute
the atmosphere
4) There may be dangers associated with the disposal of waste from the sorting, separation and metal
extraction processes
Difficulty level: difficult
Skill level: application
18. This is a diagram of a froth flotation tank:
Froth flotation is used in the extraction of some metals. What happens in the process is that ground up
ore, oil and water are pumped into the tank. Air is pumped in and the particles of metal gather in the
froth on top of the tank. Explain why this process is used in the mining industry. [4 marks]
(the answer should contain the following)
1) It is used to concentrate metal ores
2) It enables metal to be extracted that could otherwise be lost
3) It reduces the amount of metal that has to be discarded, thus making the process more efficient
4) Reducing the amount of metal discarded reduces contamination of the environment
Difficulty level: moderate
Skill level: evaluation
© HarperCollinsPublishers 2014