Cambridge IGCSE Chemistry (9-1) 0971 — 2018 Oct/Nov Paper 2 · Variant 2

Question 1

1 Oxygen and fluorine are gaseous elements next to each other in the Periodic Table. Under the same conditions of temperature and pressure, oxygen diffuses ......1...... than fluorine because its ......2...... is less than that of fluorine. Which words correctly complete gaps 1 and 2? 1 2 A faster molecular mass B faster reactivity C slower molecular mass D slower reactivity

Accepted Answer

A

Question 2

2 The diagrams show four pieces of laboratory equipment.

balance pipette stop-clock thermometer

00:00:13.08

Which equipment is essential to find out if dissolving a salt in water is an exothermic process?

balance pipette stop-clock thermometer
A x x x v
B Jv x x v
Cc x v x v
D Jv x Jv x

Accepted Answer

A

Question 3

3 How many neutrons are present in the atom 45 X ? 21 A 21 B 24 C 45 D 66

Accepted Answer

B

Question 4

4 Two naturally occurring isotopes of oxygen are 16O and 17O. Which statement is correct? A Both isotopes react with iron to form rust. B Neither isotope reacts with iron to form rust. C Only 16O reacts with iron to form rust. D Only 17O reacts with iron to form rust.

Accepted Answer

A

Question 5

5 How many electrons are used to form covalent bonds in a molecule of methanol, CH3OH? A 5 B 6 C 8 D 10

Accepted Answer

D

Question 6

6 Potassium bromide and methanol are both compounds. Their melting points are different. Which row is correct? substance with the reason why the melting points are different higher melting point A methanol the attractive forces between oppositely charged ions is greater than the attractive forces between molecules B methanol the attractive forces between molecules is greater than the attractive forces between oppositely charged ions C potassium bromide the attractive forces between oppositely charged ions is greater than the attractive forces between molecules D potassium bromide the attractive forces between molecules is greater than the attractive forces between oppositely charged ions

Accepted Answer

C

Question 7

7 Which gas sample contains the smallest number of molecules? A 4 g of helium B 16 g of oxygen C 28 g of carbon monoxide D 28 g of nitrogen

Accepted Answer

B

Question 8

8 The equation for the reaction between calcium carbonate and dilute nitric acid is shown. CaCO3(s)  +  2HNO3(aq)  →  Ca(NO3)2(aq)  +  CO2(g)  +  H2O(l) 25 g of calcium carbonate is reacted with an excess of dilute nitric acid. Which mass of calcium nitrate and which volume of carbon dioxide is produced at room temperature and pressure? mass of volume of calcium nitrate / g carbon dioxide / dm3 A 29 6 B 29 12 C 41 6 D 41 12

Accepted Answer

C

Question 9

9 The formulae of some ions are shown. positive ion negative ion Ti4+ PO4 3– Al 3+ SO4 2– Mg2+ NO3 – K+ Cl – Which formula is not correct? A Al 3(SO4)2 B K3PO4 C Mg(NO3)2 D TiCl 4

Accepted Answer

A

Question 10

10 Concentrated aqueous copper(II) chloride is electrolysed using copper electrodes as shown. power supply + – copper electrodes aqueous copper(II) chloride What happens to the mass of each electrode during this process? positive electrode negative electrode A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

B

Question 11

11 The diagram shows a circuit used to electrolyse aqueous copper(II) sulfate. power supply + – 3 4 + – copper electrodes 1 aqueous 2 copper(II) sulfate Which arrows indicate the movement of the copper ions in the electrolyte and of the electrons in the external circuit? copper ions electrons A 1 3 B 1 4 C 2 3 D 2 4

Accepted Answer

C

Question 12

12 Hydrogen peroxide, H–O–O–H, decomposes to form water and oxygen. 2H2O2(g)  →  2H2O(g)  +  O2(g) The bond energies are shown in the table. The reaction is exothermic. bond energy bond in kJ / mol O–H +460 O–O +150 O=O +496 What is the energy change for the reaction? A –346 kJ / mol B –196 kJ / mol C +196 kJ / mol D +346 kJ / mol

Accepted Answer

B

Question 13

13 The equation for the formation of ammonia is shown. N2  +  3H2  →  2NH3 The energy level diagram for the reaction is shown. activation energy = +250 kJ / mol total energy N2  +  3H2 released energy = –342 kJ / mol energy change 2NH3 progress of reaction What is the energy change for the reaction? A –592 kJ / mol B –92 kJ / mol C +92 kJ / mol D +592 kJ / mol

Accepted Answer

B

Question 14

14 The rate of reaction between magnesium ribbon and 2 mol / dm3 hydrochloric acid at 25 °C to produce hydrogen gas is measured. In another experiment, either the concentration of the hydrochloric acid or the temperature is changed. All other conditions are kept the same. Which conditions increase the rate of reaction? A 1 mol / dm3 hydrochloric acid at 25 °C B 2 mol / dm3 hydrochloric acid at 10 °C C 2 mol / dm3 hydrochloric acid at 20 °C D 3 mol / dm3 hydrochloric acid at 25 °C

Accepted Answer

D

Question 15

15 Methanol is prepared by the reversible reaction shown. CO(g)  +  2H2(g) CH3OH(g) The forward reaction is exothermic. Which conditions produce the highest equilibrium yield of methanol? temperature pressure A high high B high low C low high D low low

Accepted Answer

C

Question 16

16 The thermite reaction can be used to produce iron from iron(III) oxide. The equation for the reaction is shown. 2Al  +  Fe2O3  →  2Fe  +  Al 2O3 Which statements about this reaction are correct? 1 Aluminium is the oxidising agent. 2 Aluminium is less reactive than iron. 3 Electrons are transferred from aluminium to iron. 4 The iron in the iron(III) oxide is reduced. A 1 and 3 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

D

Question 17

17 In which row are the oxides correctly identified? acidic basic A magnesium oxide, calcium oxide sulfur dioxide, carbon dioxide B magnesium oxide, sulfur dioxide carbon dioxide, calcium oxide C sulfur dioxide, carbon dioxide calcium oxide, magnesium oxide D sulfur dioxide, magnesium oxide calcium oxide, carbon dioxide

Accepted Answer

C

Question 18

18 When dilute sulfuric acid is added to solid X, a colourless solution is formed and a gas is produced. What is X? A copper(II) oxide B sodium oxide C copper(II) carbonate D sodium carbonate

Accepted Answer

D

Question 19

19 A few drops of methyl orange are added to a reaction mixture. During the reaction, a gas is produced and the methyl orange turns from red to orange. What are the reactants? A aqueous sodium hydroxide and ammonium chloride B aqueous sodium hydroxide and calcium carbonate C dilute hydrochloric acid and magnesium D dilute hydrochloric acid and aqueous sodium hydroxide

Accepted Answer

C

Question 20

20 Some general rules for the solubility of salts in water are listed. ● Carbonates are insoluble (except ammonium carbonate, potassium carbonate and sodium carbonate). ● Chlorides are soluble (except lead(II) chloride and silver chloride). ● Nitrates are soluble. ● Sulfates are soluble (except barium sulfate, calcium sulfate and lead(II) sulfate). Which substances produce an insoluble salt when aqueous solutions of them are mixed? A barium chloride and magnesium nitrate B calcium chloride and ammonium nitrate C silver nitrate and zinc chloride D sodium carbonate and potassium sulfate

Accepted Answer

C

Question 21

21 Elements in Group I of the Periodic Table react with water. Which row describes the products made in the reaction and the trend in reactivity of the elements? products trend in reactivity A metal hydroxide and hydrogen less reactive down the group B metal hydroxide and hydrogen more reactive down the group C metal oxide and hydrogen less reactive down the group D metal oxide and hydrogen more reactive down the group

Accepted Answer

B

Question 22

22 The equation shows the reaction between a halogen and aqueous bromide ions. X2 + 2Br– → 2X– + Br2 ......1...... ......2...... ......3...... Which words complete gaps 1, 2 and 3? 1 2 3 A chlorine brown colourless B chlorine colourless brown C iodine brown colourless D iodine colourless brown

Accepted Answer

B

Question 23

23 An inert gas R is used to fill weather balloons. Which descriptions of R are correct? number of outer shell structure of gas R electrons in atoms of R A 2 diatomic molecules B 2 single atoms C 8 diatomic molecules D 8 single atoms

Accepted Answer

B

Question 24

24 Heating copper(II) carbonate produces copper(II) oxide and carbon dioxide. Heating the copper(II) oxide formed with carbon produces copper. Which processes are involved in this conversion of copper(II) carbonate to copper? A sublimation followed by oxidation B sublimation followed by reduction C thermal decomposition followed by oxidation D thermal decomposition followed by reduction

Accepted Answer

D

Question 25

25 Four metals, W, X, Y and Z, are separately reacted with water and dilute hydrochloric acid. The results are shown. metal W X Y Z reaction with water fizzes no reaction fizzes no reaction vigorously reaction with dilute fizzes no reaction fizzes fizzes hydrochloric acid violently What is the order of reactivity of the four metals starting with the least reactive? least reactive most reactive A X W Z Y B X Z W Y C Y W Z X D Y Z W X

Accepted Answer

B

Question 26

26 Which statement about the uses of metals is not correct? A Aluminium is used in aircraft because of its strength and good electrical conductivity. B Copper is used in electrical wiring because of its good electrical conductivity. C Stainless steel resists corrosion and is used to make cutlery. D Transition elements are often used as catalysts.

Accepted Answer

A

Question 27

27 Bauxite contains aluminium oxide. Aluminium is extracted from aluminium oxide by electrolysis. Why is cryolite added to the electrolytic cell used to extract aluminium? A Cryolite prevents the carbon anodes being burned away. B Cryolite removes impurities from the bauxite. C Cryolite increases the rate at which aluminium ions are discharged. D Molten cryolite dissolves the aluminium oxide.

Accepted Answer

D

Question 28

28 Which statement about the Haber process is correct? A The hydrogen used is obtained from the air. B The nitrogen used is obtained from nitrates in the soil. C Nitrogen reacts with hydrogen to make ammonia. D The reaction takes place at room temperature and pressure.

Accepted Answer

C

Question 29

29 Which statements about sulfur dioxide pollution are correct? 1 It increases the pH of rivers. 2 It damages limestone buildings. 3 It causes respiratory problems. A 1 only B 2 only C 1 and 3 D 2 and 3

Accepted Answer

D

Question 30

30 Argon is a noble gas used to fill light bulbs. What is the approximate percentage of argon in air? A 1% B 20% C 79% D 99%

Accepted Answer

A

Question 31

31 The diagrams show experiments involving the rusting of iron. tube P tube Q tube R oil iron nails water water boiled to anhydrous remove the air calcium chloride to dry the air A student predicted the following results. 1 In tube P, the iron nails rust. 2 In tube Q, the iron nails do not rust. 3 In tube R, the iron nails do not rust. Which predictions are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

A

Question 32

32 In the carbon cycle, which two processes add carbon dioxide to the atmosphere? A combustion and carbonate formation B combustion and photosynthesis C combustion and respiration D respiration and photosynthesis

Accepted Answer

C

Question 33

33 Which statement about sulfur or one of its compounds is correct? A Sulfur occurs naturally as the element sulfur. B Sulfur dioxide is used to kill bacteria in drinking water. C Sulfuric acid is a weak acid. D Dilute sulfuric acid is a dehydrating agent.

Accepted Answer

A

Question 34

34 What is not a use of lime? A It is used as a bleach in the manufacture of wood pulp. B It is used to desulfurise flue gases. C It is used to neutralise acidic industrial waste. D It is used to treat acidic soil.

Accepted Answer

A

Question 35

35 Which equation representing a reaction of methane is correct? A CH4  +  Cl 2  →  CH3Cl  +  HCl B CH4  +  Cl 2  →  CH4Cl 2 C CH4  +  Cl 2  →  CH2Cl 2  +  H2 D 2CH4  +  2Cl 2  →  2CH3Cl  +  Cl 2  +  H2

Accepted Answer

A

Question 36

36 Which two compounds are molecules which both contain a double bond? A ethane and ethanoic acid B ethane and ethanol C ethene and ethanoic acid D ethene and ethanol

Accepted Answer

C

Question 37

37 Ethanol can be formed by:

1 fermentation

2 reaction between steam and ethene.

Which of these processes use a catalyst?

—

0 ONO WwW >
~~ KN
~*~ QL €K NIN

Accepted Answer

A

Question 38

38 Ethanol is manufactured from ethene. What is an advantage of this process? A It is a continuous process. B It has high labour costs. C It needs high temperature and pressure. D It uses non-renewable materials.

Accepted Answer

A

Question 39

39 Which reaction can be used to make ethanoic acid? A oxidation of ethanol B oxidation of ethene C reduction of ethanol D reduction of ethene

Accepted Answer

A

Question 40

40 The structure of an addition polymer is shown. H OH H OH H OH C C C C C C H H H H H H Which monomer is used to make this polymer? A B C D OH OH OH H OH H H H C H H C C H C C C C H H H HO H H OH

Accepted Answer

D

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · Oxygen and fluorine are gaseous elements next to each other in the Periodic Table

Q2 · The diagrams show four pieces of laboratory equipment

Q3 · How many neutrons are present in the atom 45 X ?

Q4 · Two naturally occurring isotopes of oxygen are 16O and 17O

Q5 · How many electrons are used to form covalent bonds in a molecule of methanol, CH3OH?

Q6 · Potassium bromide and methanol are both compounds

Q7 · Which gas sample contains the smallest number of molecules?

Q8 · The equation for the reaction between calcium carbonate and dilute nitric acid is shown

Q9 · The formulae of some ions are shown

Q10 · Concentrated aqueous copper(II) chloride is electrolysed using copper electrodes as shown

Q11 · The diagram shows a circuit used to electrolyse aqueous copper(II) sulfate

Q12 · Hydrogen peroxide, H–O–O–H, decomposes to form water and oxygen

Q13 · The equation for the formation of ammonia is shown

Q14 · The rate of reaction between magnesium ribbon and 2 mol / dm3 hydrochloric acid at 25 °C…

Q15 · Methanol is prepared by the reversible reaction shown

Q16 · The thermite reaction can be used to produce iron from iron(III) oxide

Q17 · In which row are the oxides correctly identified?

Q18 · When dilute sulfuric acid is added to solid X, a colourless solution is formed and a gas…

Q19 · A few drops of methyl orange are added to a reaction mixture

Q20 · Some general rules for the solubility of salts in water are listed

Q21 · Elements in Group I of the Periodic Table react with water

Q22 · The equation shows the reaction between a halogen and aqueous bromide ions

Q23 · An inert gas R is used to fill weather balloons

Q24 · Heating copper(II) carbonate produces copper(II) oxide and carbon dioxide

Q25 · Four metals, W, X, Y and Z, are separately reacted with water and dilute hydrochloric acid

Q26 · Which statement about the uses of metals is not correct?

Q27 · Bauxite contains aluminium oxide

Q28 · Which statement about the Haber process is correct?

Q29 · Which statements about sulfur dioxide pollution are correct?

Q30 · Argon is a noble gas used to fill light bulbs

Q31 · The diagrams show experiments involving the rusting of iron

Q32 · In the carbon cycle, which two processes add carbon dioxide to the atmosphere?

Q33 · Which statement about sulfur or one of its compounds is correct?

Q34 · What is not a use of lime?

Q35 · Which equation representing a reaction of methane is correct?

Q36 · Which two compounds are molecules which both contain a double bond?

Q37 · Ethanol can be formed by: 1 fermentation 2 reaction between steam and ethene

Q38 · Ethanol is manufactured from ethene

Q39 · Which reaction can be used to make ethanoic acid?

Q40 · The structure of an addition polymer is shown

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