Cambridge IGCSE Chemistry (9-1) 0971 — 2019 May/June Paper 2 · Variant 1

Question 1

1 Which statement explains why ammonia gas, NH3, diffuses at a faster rate than hydrogen chloride gas, HCl ? A Ammonia expands to occupy all of the space available. B Ammonia has a smaller relative molecular mass than hydrogen chloride. C Ammonia is an alkali and hydrogen chloride is an acid. D Ammonia molecules diffuse in all directions at the same time.

Accepted Answer

B

Question 2

2 2.00 g of powdered calcium carbonate is added to 50.0 cm3 of hydrochloric acid. Which apparatus is used to measure the calcium carbonate and the hydrochloric acid? calcium carbonate hydrochloric acid A balance burette B balance thermometer C pipette burette D pipette thermometer

Accepted Answer

A

Question 3

3 The measurements from a chromatography experiment using substance F are shown. The diagram is not drawn to scale. solvent front distance moved by F 100 mm 90 mm 55 mm 15 mm baseline What is the Rf value of F? A 0.55 B 0.61 C 0.90 D 1.64

Accepted Answer

B

Question 4

4 Which statement about an atom of fluorine, 19 9 , is correct? F A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.

Accepted Answer

B

Question 5

5 Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of electrons in their outer shell C electrons are transferred from one both atoms gain a atom to another noble gas electronic structure D electrons are transferred from one both atoms have the same number atom to another of electrons in their outer shell

Accepted Answer

A

Question 6

6 Which statement describes the structure of an ionic compound? A It is a giant lattice of oppositely charged ions. B It is a giant lattice of positive ions in a ‘sea’ of electrons. C It is a giant molecule of oppositely charged ions. D It is a simple molecule of oppositely charged ions.

Accepted Answer

A

Question 7

7 Propane burns in oxygen. C3H8  +  xO2  →  3CO2  +  yH2O Which values of x and y balance the equation? x y A 5 4 B 7 4 C 10 8 D 13 8

Accepted Answer

A

Question 8

8 A tablet contains 0.080 g of ascorbic acid (Mr = 176). What is the concentration of ascorbic acid when one tablet is dissolved in 200 cm3 of water? A 9.1 × 10–5 mol / dm3 B 4.5 × 10–4 mol / dm3 C 9.1 × 10–2 mol / dm3 D 2.3 × 10–3 mol / dm3

Accepted Answer

D

Question 9

9 Which statement about the electrolysis of copper(II) sulfate solution using carbon electrodes is correct? A A colourless gas is produced at the anode. B A colourless gas is produced at the cathode. C The colour of the electrolyte remains the same. D The mass of both electrodes remains constant.

Accepted Answer

A

Question 10

10 Aluminium metal is extracted from aluminium oxide by electrolysis. Which ionic half-equation describes a reaction that occurs at the named electrode? ionic half-equation electrode A 2O2–  →  O2  +  2e– anode B Al 3+  +  3e–  →  Al anode C 2O2–  →  O2  +  4e– cathode D Al 3+  +  3e–  →  Al cathode

Accepted Answer

D

Question 11

11 Which statement about the hydrogen fuel cell is not correct? A Chemical energy is converted into electrical energy. B Hydrogen is oxidised. C The reaction that takes place is endothermic. D Water is the only product.

Accepted Answer

C

Question 12

12 Nitrogen reacts with hydrogen to produce ammonia. N2  +  3H2  →  2NH3 The reaction is exothermic. The bond energies are shown in the table. bond energy bond in kJ / mol N≡N 945 H–H 436 N–H 390 What is the energy change for this reaction? A –1473 kJ / mol B –87 kJ / mol C 87 kJ / mol D 1473 kJ / mol

Accepted Answer

B

Question 13

13 Which change in reaction conditions increases both the collision rate and the proportion of molecules with sufficient energy to react? A addition of a catalyst B increasing the concentration of a reactant C increasing the surface area of a reactant D increasing the temperature of the reaction

Accepted Answer

D

Question 14

14 When blue-green crystals of nickel(II) sulfate are heated, water is produced and a yellow solid remains. When water is added to the yellow solid, the blue-green colour returns. Which process describes these changes? A combustion B corrosion C neutralisation D reversible reaction

Accepted Answer

D

Question 15

15 The graph shows how the yield of product in a reversible reaction changes as the temperature and pressure are changed. All reactants and products are gases. reactants products yield of product 300 °C 100 °C pressure Which row is correct for this reversible reaction? side of reaction forward with fewer moles reaction A reactant exothermic B reactant endothermic C product endothermic D product exothermic

Accepted Answer

B

Question 16

16 Which changes represent oxidation? 1 2I–  →  I2  +  2e– 2 Cr(VI)  →  Cr(III) 3 Fe(II)  →  Fe(III) A 1 and 2 B 1 and 3 C 1 only D 2 only

Accepted Answer

B

Question 17

17 Nitrogen(I) oxide, N2O, nitrogen(II) oxide, NO, and carbon monoxide, CO, are all non-metal oxides. They do not react with acids or bases. Which statement is correct? A They are acidic oxides. B They are amphoteric oxides. C They are basic oxides. D They are neutral oxides.

Accepted Answer

D

Question 18

18 The positions of elements W, X, Y and Z in the Periodic Table are shown. W Y X Z Which elements form basic oxides? A W, X and Y B W and X only C Y only D Z only

Accepted Answer

A

Question 19

19 Ethanoic acid is a weak acid. Hydrochloric acid is a strong acid. Which statements are correct? 1 Ethanoic acid molecules are partially dissociated into ions. 2 1.0 mol / dm3 ethanoic acid has a higher pH than 1.0 mol / dm3 hydrochloric acid. 3 Ethanoic acid is always more dilute than hydrochloric acid. 4 Ethanoic acid is a proton acceptor. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Accepted Answer

A

Question 20

20 The properties of an element are shown. electrical conductivity density reaction with water high low reacts violently with cold water Which element has these properties? A B C D

Accepted Answer

D

Question 21

21 Which statement about elements in Group I and Group VII of the Periodic Table is correct? A Bromine reacts with potassium chloride to produce chlorine. B Iodine is a monoatomic non-metal. C Lithium has a higher melting point than potassium. D Sodium is more reactive with water than potassium.

Accepted Answer

C

Question 22

22 Which statement about elements in Group VIII of the Periodic Table is correct? A They all have a full outer shell of electrons. B They all react with Group I elements to form ionic compounds. C They are all diatomic molecules. D They are all liquids at room temperature.

Accepted Answer

A

Question 23

23 The diagrams show the structure of two substances used to make electrical conductors. X Y Which statement correctly describes X and Y? A X is a pure metal and Y is a compound. B X is a pure metal and Y is an alloy. C X is a solid and Y is a liquid. D X is harder and stronger than Y.

Accepted Answer

B

Question 24

24 Three metal compounds, P, Q and R, are heated using a Bunsen burner. The results are shown. P colourless gas produced, which relights a glowing splint Q colourless gas produced, which turns limewater milky R no reaction Which row shows the identity of P, Q and R? P Q R A magnesium carbonate potassium carbonate potassium nitrate B magnesium carbonate potassium nitrate potassium carbonate C potassium nitrate magnesium carbonate potassium carbonate D potassium nitrate potassium carbonate magnesium carbonate

Accepted Answer

C

Question 25

25 Zinc is extracted from its ore, zinc blende, using two chemical reactions. 1 2ZnS  +  3O2  →  2ZnO  +  2SO2 2 2ZnO  +  C  →  2Zn  +  CO2 Which substance is reduced in reactions 1 and 2? reaction 1 reaction 2 A O2 C B O2 ZnO C ZnS C D ZnS ZnO

Accepted Answer

B

Question 26

26 Four metals, zinc, M, copper and magnesium, are reacted with aqueous solutions of their
nitrates.

The results are shown.

magnesium M copper zinc
metal . . ; ;
nitrate nitrate nitrate nitrate
magnesium v v v key
zinc x Jv v J/ = reacts
M x Jv x X =no reaction
copper x x

What is the order of reactivity of these four metals starting with the most reactive?
A copper > zinc + M + magnesium
B copper > M -> zinc + magnesium
C magnesium > M -> zinc > copper
D

magnesium — zinc + M -— copper

Accepted Answer

D

Question 27

27 Why is aluminium used to make containers for storing food? A It conducts electricity. B It has a high melting point. C It is resistant to corrosion. D It is strong.

Accepted Answer

C

Question 28

28 Water can be treated by filtration then chlorination. Which uses do not need water of this quality? 1 water for cooling in industry 2 water for washing clothes 3 water for drinking A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

B

Question 29

29 Oxides of nitrogen are formed in car engines and are a source of air pollution. To decrease this pollution, catalytic converters are fitted to car exhausts. What happens to the oxides of nitrogen in the catalytic converter? A combustion B cracking C oxidation D reduction

Accepted Answer

D

Question 30

30 The diagram shows an experiment to investigate how paint affects the rusting of iron. P Q iron painted iron air water What happens to the water level in tubes P and Q? tube P tube Q A falls rises B no change rises C rises falls D rises no change

Accepted Answer

D

Question 31

31 Ammonia is manufactured by the Haber Process. N2(g)  +  3H2(g) 2NH3(g) The forward reaction is exothermic. Which conditions maximise the yield of ammonia? pressure temperature A high high B high low C low high D low low

Accepted Answer

B

Question 32

32 The carbon cycle is shown. atmospheric carbon dioxide X respiration decomposition Y Z green plants dead organic matter death and excretion animals Which row describes processes X, Y and Z? X Y Z A respiration combustion photosynthesis B respiration photosynthesis combustion C photosynthesis combustion respiration D photosynthesis respiration combustion

Accepted Answer

C

Question 33

33 Which row shows the conditions used in the Contact process? temperature pressure catalyst / °C / atm A 25 2 iron B 25 200 iron C 450 2 vanadium(V) oxide D 450 200 vanadium(V) oxide

Accepted Answer

C

Question 34

34 The diagram represents a lime kiln used to heat limestone to a very high temperature. waste gases lime kiln limestone fuel in fuel in air in air in X What leaves the kiln at X? A calcium carbonate B calcium hydroxide C calcium oxide D calcium sulfate

Accepted Answer

C

Question 35

35 Which fuel could be gasoline? Is it obtained from petroleum? yes no Is it used as Is it used as fuel for cars? fuel for cars? yes no yes no A B C D

Accepted Answer

A

Question 36

36 Why is ethanol a member of the homologous series of alcohols but propane is not? A Ethanol has two carbon atoms per molecule but propane has three. B Ethanol can be made from ethene but propane is obtained from petroleum. C Ethanol is a liquid but propane is a gas. D Ethanol contains the same functional group as other alcohols but propane does not.

Accepted Answer

D

Question 37

37 Chlorine reacts with methane. Which statements are correct? 1 The reaction takes place in the dark. 2 The reaction of chlorine with methane forms chloromethane. 3 Chloromethane reacts with chlorine to produce dichloromethane. 4 The reaction of chlorine with methane is an addition reaction. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Accepted Answer

C

Question 38

38 Which statements about aqueous ethanoic acid are correct? 1 Ethanoic acid contains the functional group –COOH. 2 Ethanoic acid reacts with carbonates to produce hydrogen. 3 Ethanoic acid turns Universal Indicator paper blue. 4 Ethanoic acid has a pH lower than pH 7. A 1 and 2 B 1 and 3 C 1 and 4 D 2 and 4

Accepted Answer

C

Question 39

39 The structure of an ester is shown. O CH3 C OCH2CH2CH3 What is the name of the ester? A ethyl propanoate B methyl propanoate C propyl ethanoate D propyl methanoate

Accepted Answer

C

Question 40

40 The structure of a polymer is shown. O O O O Which type of polymer is shown and by which process is it formed? type of polymer formed by A carbohydrate addition polymerisation B carbohydrate condensation polymerisation C polyester addition polymerisation D polyester condensation polymerisation

Accepted Answer

B

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · Which statement explains why ammonia gas, NH3, diffuses at a faster rate than hydrogen…

Q2 · 2.00 g of powdered calcium carbonate is added to 50.0 cm3 of hydrochloric acid

Q3 · The measurements from a chromatography experiment using substance F are shown

Q4 · Which statement about an atom of fluorine, 19 9 , is correct?

Q5 · Which row describes the formation of single covalent bonds in methane?

Q6 · Which statement describes the structure of an ionic compound?

Q7 · Propane burns in oxygen

Q8 · A tablet contains 0.080 g of ascorbic acid (Mr = 176)

Q9 · Which statement about the electrolysis of copper(II) sulfate solution using carbon…

Q10 · Aluminium metal is extracted from aluminium oxide by electrolysis

Q11 · Which statement about the hydrogen fuel cell is not correct?

Q12 · Nitrogen reacts with hydrogen to produce ammonia

Q13 · Which change in reaction conditions increases both the collision rate and the proportion…

Q14 · When blue-green crystals of nickel(II) sulfate are heated, water is produced and a yellow…

Q15 · The graph shows how the yield of product in a reversible reaction changes as the…

Q16 · Which changes represent oxidation?

Q17 · Nitrogen(I) oxide, N2O, nitrogen(II) oxide, NO, and carbon monoxide, CO, are all…

Q18 · The positions of elements W, X, Y and Z in the Periodic Table are shown

Q19 · Ethanoic acid is a weak acid

Q20 · The properties of an element are shown

Q21 · Which statement about elements in Group I and Group VII of the Periodic Table is correct?

Q22 · Which statement about elements in Group VIII of the Periodic Table is correct?

Q23 · The diagrams show the structure of two substances used to make electrical conductors

Q24 · Three metal compounds, P, Q and R, are heated using a Bunsen burner

Q25 · Zinc is extracted from its ore, zinc blende, using two chemical reactions

Q26 · Four metals, zinc, M, copper and magnesium, are reacted with aqueous solutions of their…

Q27 · Why is aluminium used to make containers for storing food?

Q28 · Water can be treated by filtration then chlorination

Q29 · Oxides of nitrogen are formed in car engines and are a source of air pollution

Q30 · The diagram shows an experiment to investigate how paint affects the rusting of iron

Q31 · Ammonia is manufactured by the Haber Process

Q32 · The carbon cycle is shown

Q33 · Which row shows the conditions used in the Contact process?

Q34 · The diagram represents a lime kiln used to heat limestone to a very high temperature

Q35 · Which fuel could be gasoline?

Q36 · Why is ethanol a member of the homologous series of alcohols but propane is not?

Q37 · Chlorine reacts with methane

Q38 · Which statements about aqueous ethanoic acid are correct?

Q39 · The structure of an ester is shown

Q40 · The structure of a polymer is shown

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