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Science questions, chapter 4
Nama / NameKelas / ClassTarikh / Date

Reactivity of metals

44 marks. Use Practice to check each answer as you go, or Exam to answer everything against the clock first.

Section A: objective questions

12 marks
Choose the best answer for each question.
1

Question 1

Which statement describes a mineral?
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B
Minerals are solid elements or compounds that occur naturally with a definite crystalline structure and chemical composition (textbook p. 125).
For the teacher: Remembering, low difficulty, standard 4.1
Textbook p. 125
2

Question 2

Galena is a natural compound that is the ore of lead. Which elements are combined in galena?
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D
Galena is plumbum(II) sulphide, a compound of lead and sulphur (textbook Table 4.1, p. 125). Plumbum is lead and sulphide means sulphur.
For the teacher: Remembering, low difficulty, standard 4.1
Textbook p. 125
3

Question 3

Calcium carbonate is heated strongly and the gas released is passed through limewater. The limewater turns cloudy. Which gas is released?
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A
Limewater turns cloudy only with carbon dioxide. Calcium carbonate decomposes to calcium oxide and carbon dioxide.
For the teacher: Understanding, low difficulty, standard 4.1
Textbook p. 127
4

Question 4

Which of the following minerals is an element?
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C
Gold is found in the Earth's crust as an element. Hematite (iron oxide), quartz (silicon dioxide) and calcite (calcium carbonate) are compounds.
For the teacher: Remembering, low difficulty, standard 4.1
Textbook p. 125
5

Question 5

The reactivity series of metals arranges metals according to their reactivity towards
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B
The reactivity series is a list of metals arranged by how vigorously they react with oxygen (textbook p. 129).
For the teacher: Remembering, low difficulty, standard 4.2
Textbook p. 129
6

Question 6

Four metals are heated in oxygen. Metal W burns very brightly, X glows dimly, Y burns slowly and Z glows brightly. Which is the correct order from the most reactive to the least reactive?
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D
The more vigorous the reaction, the more reactive the metal: burns very brightly (W) > burns slowly (Y) > glows brightly (Z) > glows dimly (X).
For the teacher: Applying, medium difficulty, standard 4.2
Textbook p. 131
7

Question 7

When a mixture of zinc oxide and carbon is heated strongly, zinc is formed. What does this show?
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A
Carbon removed oxygen from zinc oxide, so carbon is more reactive than zinc (carbon is placed above zinc in the series).
For the teacher: Understanding, medium difficulty, standard 4.2
Textbook p. 133
8

Question 8

Hydrogen reduces copper(II) oxide and lead(II) oxide, but does not reduce zinc oxide or aluminium oxide. Which arrangement shows the position of hydrogen?
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C
Hydrogen cannot reduce zinc oxide, so it is less reactive than zinc. It reduces the oxides of lead and copper, so it is more reactive than they are. It sits between zinc and lead.
For the teacher: Applying, medium difficulty, standard 4.2
Textbook p. 134
9

Question 9

How is aluminium extracted from its ore?
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B
Aluminium is higher than carbon in the reactivity series, so carbon cannot reduce its oxide. It is extracted by electrolysis of the molten compound.
For the teacher: Remembering, low difficulty, standard 4.3
Textbook p. 137
10

Question 10

In a blast furnace used to extract iron, which substance floats on the molten iron and is tapped off separately?
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A
Slag is less dense than molten iron and floats on top of it, so it is tapped off separately from the molten iron.
For the teacher: Understanding, low difficulty, standard 4.3
Textbook p. 139
11

Question 11

Carbon reduces the oxide of metal R but cannot reduce the oxide of metal Q. Which statement is correct?
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C
Carbon cannot take oxygen from Q's oxide, so Q is more reactive than carbon. Carbon can reduce R's oxide, so R is less reactive than carbon. Q is therefore the most reactive of the three.
For the teacher: Analysing, medium difficulty, standard 4.3
Textbook p. 137
12

Question 12

A company plans to extract iron near a town. Which action would best reduce air pollution from the blast furnace?
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D
Filtering the gases removes pollutants before they are released. A taller chimney only spreads them, burning more fuel adds pollution, and washing ore in a river pollutes the water.
For the teacher: Evaluating, medium difficulty, standard 4.3
Textbook p. 140

Section B: structured questions

32 marks
Answer all questions. Write your answers in the spaces provided.
13

Question 13

A student heats calcium carbonate strongly in a boiling tube and passes the gas released through limewater.
[1 mark] (a)Name the gas released.
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Tick each point you got.
[1 mark] (b)State the change in the limewater.
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[1 mark] (c)Complete the word equation: calcium carbonate → ______ + carbon dioxide
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[3 marks] (d)Name the three elements combined in calcium carbonate.
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For the teacher: Remembering, low difficulty, standard 4.1
Textbook p. 126
14

Question 14

Four metals, W, X, Y and Z, are heated in oxygen. The table shows the observations. One of the metals is iron.
MetalObservation
WBurns very quickly and brightly
XGlows dimly
YGlows brightly
ZBurns slowly
[1 mark] (a)Arrange the metals in order of decreasing reactivity towards oxygen.
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[1 mark] (b)Which metal is iron?
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Y
Iron glows brightly when heated in oxygen.
[1 mark] (c)Write the word equation for the reaction of iron with oxygen.
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[1 mark] (d)State the relationship between the vigour of the reaction and the reactivity of the metal.
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For the teacher: Applying, medium difficulty, standard 4.2
Textbook p. 131
15

Question 15

Metal oxides were each mixed with carbon powder and heated strongly. The table shows the results.
MixtureObservation
Zinc oxide and carbonShiny grey metal formed; gas turned limewater cloudy
Aluminium oxide and carbonNo change
Lead(II) oxide and carbonShiny grey bead formed; gas turned limewater cloudy
[1 mark] (a)Write the word equation for the reaction between zinc oxide and carbon.
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[2 marks] (b)Name the metal oxide that carbon cannot reduce and explain why.
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[1 mark] (c)Arrange aluminium, carbon and zinc in order of increasing reactivity.
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[1 mark] (d)State one use of this result in industry.
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For the teacher: Analysing, medium difficulty, standard 4.2
Textbook p. 133
16

Question 16

Diagram 1 shows the apparatus used to find out how a metal powder reacts with a gas released by heating potassium manganate(VII) crystals.
Boiling tube lying on its side with metal powder on a porcelain plate at one end, glass wool in the middle and potassium manganate(VII) crystals at the other end
Diagram 1
[1 mark] (a)Name the gas released by the potassium manganate(VII) crystals.
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[1 mark] (b)Why is glass wool placed between the metal powder and the crystals?
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[1 mark] (c)State the correct order of heating.
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[1 mark] (d)State the aim of this activity.
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For the teacher: Applying, low difficulty, standard 4.2
Textbook p. 130
17

Question 17

Diagram 2 shows a blast furnace used to extract iron.
Blast furnace with P at the top inlet, Q at the hot air inlet, R at the upper outlet and S at the lower outlet
Diagram 2
[2 marks] (a)Name two substances added at P.
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Any 2 points
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[1 mark] (b)What is blown in at Q?
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[2 marks] (c)Name the substances tapped off at R and at S.
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[1 mark] (d)Why does the substance at R float on the substance at S?
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For the teacher: Understanding, low difficulty, standard 4.3
Textbook p. 138
18

Question 18

A company wants to open a bauxite mine on a hillside near a river and a village.
[2 marks] (a)State two problems that the mine may cause.
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Any 2 points
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[2 marks] (b)Suggest two ways to reduce the harm to the environment.
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For the teacher: Evaluating, high difficulty, standard 4.3
Textbook p. 140
19

Question 19

Lead(II) oxide is a yellow powder. Plan a simple activity to show that carbon is more reactive than lead.
[3 marks] (a)State the materials and apparatus, the steps you will follow and the result you expect.
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For the teacher: Creating, high difficulty, standard 4.2
Textbook p. 132