Key Stage 3 Science Book 3 Assessments
Obtaining Useful Materials (Blue level)
Answers
1. When added to a dilute acid, copper shows no visible change. Why is this? [1 mark]
a)
Difficulty level: easy
Skill level: application
2. Which of the following forms when galena (lead sulfide) is heated with carbon? [1 mark]
d)
Difficulty level: easy
Skill level: application
3. Which of the following does not happen when magnesium is added to a solution of copper sulfate? [1
mark]
d)
Difficulty level: moderate
Skill level: application
4. A mining company is seeking permission to mine for metal ore. Which of the following is a method of
land reclamation? [1 mark]
d)
Difficulty level: easy
Skill level: evaluation
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. Some students are investigating a chemical reaction. They explore what they can add to it to make
the reaction more vigourous and find out that liver seems to make it work well. However, after the
reaction has finished they find that all the liver has been left behind.
Which one of these statements is not a valid conclusion? [1 mark]
c)
Difficulty level: moderate
Skill level: evaluation
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
7.Which two applications might ceramics be useful for? [1 mark]
a), c)
Difficulty level: moderate
Skill level: application
8. 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
9.Which two objects are often made from ceramics? [1 mark]
a), d)
Difficulty level: easy
Skill level: knowledge
10. Which two statements about catalysts are true? [1 mark]
c), d)
Difficulty level: moderate
Skill level: knowledge
11. What is a polymer? [2 marks]
(the answer should contain the following)
1) Long chains made from atoms
2) Chains contain repeating chemical units (molecules called monomers)
Difficulty level: easy
Skill level: knowledge
12. 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
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
13. Why are bricks made from mud and straw said to be composites? [2 marks]
(the answer should contain the following)
1) Two different materials are used to make the bricks
2) The combination of materials gives the bricks desirable properties that either of them alone would
not
Difficulty level: easy
Skill level: application
14. 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
15. Why is gold a native metal, but iron is not? [2 marks]
(the answer should contain the following)
1) Gold is found uncombined in nature
2) Iron is always found chemically bonded
Difficulty level: easy
Skill level: application
16. Which types of fibres are usually used to reinforce plastic? [2 marks]
(the answer should contain the following)
1) Glass
2) Carbon
Difficulty level: moderate
Skill level: knowledge
17. Outline what happens when carbon is used to extract iron, including the types of chemical reactions.
[4 marks]
(the answer should contain the following)
1) Carbon is heated with iron oxide
2) A displacement reaction happens
3) Iron oxide is reduced (oxygen removed)
4) Carbon is oxidised (gains oxygen) to form carbon dioxide
Difficulty level: easy
Skill level: knowledge
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
18. This graph shows the percentage abundance of the elements in the Earth’s crust
What does this show about which metals are more common in the crust? [4 marks]
(the answer should contain the following)
1) Aluminium is the most common at 8.1%
2) Iron is the second most common at 5%
3) Others present in significant amounts are calcium, magnesium, sodium and potassium
4) Silicon is not a metal but a metalloid
Difficulty level: easy
Skill level: evaluation
© HarperCollinsPublishers 2014