Cambridge IGCSE Chemistry (9-1) 0971 — 2025 May/June Paper 2 · Variant 2

Question 1

1 An ice cube melts. ice cube pool of water What happens to the molecules of water in the ice cube? A They evaporate. B They dissolve. C They gain energy. D They lose energy.

Accepted Answer

C

Question 2

2 A sample of a liquid, X, is heated to a temperature above its boiling point. X is then cooled, so that it condenses and then freezes. Which graph describes the change in temperature of X over time? A B temperature / °C temperature / °C time / s time / s C D temperature / °C temperature / °C time / s time / s

Accepted Answer

D

Question 3

3 Which row gives the number of protons, electrons and neutrons in an atom of zinc? protons electrons neutrons A 30 30 35 B 30 35 35 C 35 30 30 D 35 35 30

Accepted Answer

A

Question 4

4 Which particles have the electronic configuration 2,8,8? 1 an argon atom, Ar 2 an aluminium ion, Al 3+ 3 a sodium ion, Na+ 4 a chloride ion, Cl – A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Accepted Answer

B

Question 5

5 A sample of element Q has two isotopes. Their relative masses and abundances are shown. relative mass abundance of isotope / % 238 66 244 34 What is the relative atomic mass of this sample of Q to three significant figures? A 240 B 241 C 242 D 243

Accepted Answer

A

Question 6

6 Which statement about silicon(IV) oxide, SiO2, is correct? A It conducts electricity because it contains delocalised electrons. B It has a giant covalent structure with each silicon atom bonded to four oxygen atoms. C It is a simple covalent molecule. D Its structure is similar to that of graphite.

Accepted Answer

B

Question 7

7 When 65 g of zinc reacts with 32 g of sulfur, 97 g of zinc sulfide is produced. When 65 g of zinc reacts with 40 g of sulfur, the mass of zinc sulfide produced is still 97 g. Which statement explains this observation? A Some of the zinc sulfide evaporates. B The reaction rate is slow. C The reaction stops before it is complete. D Zinc is the limiting reactant.

Accepted Answer

D

Question 8

8 Aluminium reacts with iron(III) oxide to form aluminium oxide and iron. Which chemical equation for the reaction between aluminium and iron(III) oxide is correct? A Al  +  FeO    Al O  +  Fe B 2Al  +  Fe2O    Al 2O  +  2Fe C Al  +  Fe2O3    Al 2O3  +  Fe D 2Al  +  Fe2O3    Al 2O3  +  2Fe

Accepted Answer

D

Question 9

9 The concentration of a solution of aqueous sodium hydroxide is 0.50 mol / dm3. Which mass of sodium hydroxide is used to make 500 cm3 of this solution? A 10 g B 20 g C 40 g D 160 g

Accepted Answer

A

Question 10

10 Molten zinc oxide is electrolysed using inert electrodes. Which row identifies the product at each electrode? anode cathode A zinc oxygen B hydrogen oxygen C oxygen zinc D oxygen hydrogen

Accepted Answer

C

Question 11

11 Dilute aqueous sodium chloride is electrolysed using platinum electrodes. What is the half-equation for the reaction at the cathode? A 2H+  +  2e–    H2 B Na+  +  e–    Na C 2Cl –    Cl 2  +  2e– D 4OH–    2H2O  +  O2  +  4e–

Accepted Answer

A

Question 12

12 Hydrogen–oxygen fuel cells can be used to power vehicles. Which statement about hydrogen–oxygen fuel cells is correct? A The equation for the overall reaction is H2  +  O2    H2O2. B The only chemical products are water and carbon dioxide. C Chemical energy in the fuel is converted into electrical energy. D The hydrogen used in hydrogen–oxygen fuel cells is a fossil fuel.

Accepted Answer

C

Question 13

13 A reaction pathway diagram is shown. products energy reactants progress of reaction Which row identifies the type of reaction and how the temperature of the surroundings changes during the reaction? temperature of type of reaction the surroundings A endothermic decreases B endothermic increases C exothermic decreases D exothermic increases

Accepted Answer

A

Question 14

14 The average bond energy for the C–H bond is 413 kJ / mol. What is the enthalpy change when 1.0 mol of methane molecules is formed from carbon and hydrogen atoms? A –1652 kJ B – 413 kJ C +413 kJ D +1652 kJ

Accepted Answer

A

Question 15

15 Which statement describes the effect of adding a catalyst to a chemical reaction? A The activation energy, Ea, of the reaction is increased. B The enthalpy change, H, of the reaction stays unchanged. C The frequency of collisions between the particles is decreased. D The kinetic energy of the particles is increased.

Accepted Answer

B

Question 16

16 Which row describes the conditions used in the manufacture of sulfuric acid by the Contact process? catalyst pressure temperature A iron high high B iron low low C vanadium(V) oxide high low D vanadium(V) oxide low high

Accepted Answer

D

Question 17

17 Which equations show the underlined species acting as a reducing agent? 1 Fe2O3  +  3CO    2Fe  +  3CO2 2 Fe  +  CuSO4    FeSO4  +  Cu 3 5Fe2+  +  MnO4 –  +  8H+    5Fe3+  +  Mn2+  +  4H2O 4 Fe(OH)2  +  H2SO4    FeSO4  +  2H2O A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

C

Question 18

18 A farmer incorrectly adds two substances to the soil at the same time. They react together to form a gas which turns damp red litmus paper blue. What are the two substances? A a basic oxide and a potassium salt B a basic oxide and an ammonium salt C an acidic oxide and a potassium salt D an acidic oxide and an ammonium salt

Accepted Answer

B

Question 19

19 Which row shows the equations for the dissociation of hydrochloric acid and of ethanoic acid in
aqueous solution?

hydrochloric acid ethanoic acid

HCl(aq) > H*(aq) + Cl-(aq) CH,COOH(aq) = H*(aq) + CH,COO (aq)
HCi(aq) =  H’*(aq) + Cl-(aq) CH,COOH(aq) = H*(aq) + CH,COO (aq)

HCl(aq) — H*(aq) + Cl-(aq) CH,COOH(aq) — H*(aq) + CH,COO (aq)

0 |QO WD PY}

HCl(aq) — H’*(aq) + Cl(aq) CH,COOH(aq) — H*(aq) + CH,COO (aq)

Accepted Answer

A

Question 20

20 Which three oxides are all acidic? A CaO, NO2, SO2 B CaO, CO2, Na2O C CO2, NO2, SO2 D CO2, Na2O, SO2

Accepted Answer

C

Question 21

21 The table shows some properties of noble gases. density boiling point noble gas in g / dm3 in °C helium 0.2 –269 neon 0.9 –246 argon 1.8 –186 krypton xenon 5.9 –108 Which row predicts the density and the boiling point of krypton? density boiling point in g / dm3 in C A 1.4 –75 B 2.4 –195 C 3.8 –153 D 8.5 –213

Accepted Answer

C

Question 22

22 Sodium is a Group I metal. What is a physical property of sodium? A non-conductor of electricity B high melting point C high density D malleable

Accepted Answer

D

Question 23

23 Tennessine (atomic number 117) is a manufactured element that is below astatine in Group VII of the Periodic Table. What is the expected state of tennessine at room temperature and pressure? A a diatomic gas B a liquid C a monatomic gas D a solid

Accepted Answer

D

Question 24

24 When chlorine is bubbled into aqueous sodium bromide, a displacement reaction occurs. Which description of this reaction is correct? A Chloride displaces bromide. B Chlorine displaces bromine. C Chloride displaces bromine. D Chlorine displaces bromide.

Accepted Answer

B

Question 25

25 Brass is an alloy of copper. Which statement about brass or copper is correct? A Brass does not conduct electricity because it is a compound. B Copper conducts electricity because its atoms are free to move. C Brass is harder than copper because its layers of atoms cannot easily slide over each other. D Copper is stronger than brass because it is a pure metal.

Accepted Answer

C

Question 26

26 The ionic equations for some reactions between metals and aqueous metal ions are shown. Cu  +  2Ag+    2Ag  +  Cu2+ Mg  +  Zn2+    Mg2+  +  Zn Zn  +  Cu2+    Cu  +  Zn2+ Sn  +  Cu2+    Sn2+  +  Cu Which further information can be used to place copper, magnesium, silver, tin and zinc in order of their reactivity? A Zinc reacts with Sn2+ ions. B Copper does not react with Sn2+ ions. C Magnesium reacts with Cu2+ ions. D Magnesium reacts with Ag+ ions.

Accepted Answer

A

Question 27

27 Zinc is used to galvanise iron to prevent it from rusting. Which statements are correct? 1 Galvanising is an example of a barrier method. 2 If the zinc is scratched, the iron will rust very quickly. 3 Galvanising is an example of sacrificial protection. 4 Zinc is more reactive than iron and so accepts electrons more readily. A 1, 2 and 4 B 1 and 3 C 2, 3 and 4 D 2 and 3 only

Accepted Answer

B

Question 28

28 Which equation represents a reaction that occurs in a blast furnace during the extraction of iron from hematite? A Ca  +  CO2    CaO  +  CO B Fe2O3  +  3Ca    2Fe  +  3CaO C Ca(OH)2    CaO  +  H2O D Fe2O3  +  3CO    2Fe  +  3CO2

Accepted Answer

D

Question 29

29 Water is added separately to anhydrous copper(II) sulfate and to anhydrous cobalt(II) chloride. Which row shows the colour changes? anhydrous anhydrous copper(II) sulfate cobalt(II) chloride A blue to white blue to pink B blue to white pink to blue C white to blue blue to pink D white to blue pink to blue

Accepted Answer

C

Question 30

30 Gases which cause acid rain form in car engines. These gases can be removed using a catalytic converter. Which equation represents the removal of one of these gases using a catalytic converter? A CO2  +  C    2CO B 2CO  +  2NO    2CO2  +  N2 C N2  +  2O2    2NO2 D 2NO  +  O2    2NO2

Accepted Answer

B

Question 31

31 Which statements about carbon dioxide are correct? 1 Carbon dioxide absorbs thermal energy from the Earth. 2 Carbon dioxide increases the thermal energy loss to space. 3 The level of carbon dioxide in the atmosphere has increased due to the burning of fossil fuels. 4 Carbon dioxide is the only gas that causes global warming. A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

Accepted Answer

B

Question 32

32 What is the structural formula of butan-2-ol? A CH3CH2CH2OH B CH3CH(OH)CH3 C CH3CH2CH2CH2OH D CH3CH2CH(OH)CH3

Accepted Answer

D

Question 33

33 Methanol reacts with ethanoic acid to form an ester. What is the displayed formula for this ester? A B O H O H H H C O C H H C O C C H H H H C D H O H H O H H H C C O C H H C C O C C H H H H H H

Accepted Answer

C

Question 34

34 Petroleum can be separated into useful fractions by fractional distillation. Which row shows a correct use of the named fraction? fraction use A bitumen lubricant B naphtha fuel for home heating C kerosene jet fuel D refinery gas making chemicals

Accepted Answer

C

Question 35

35 Ethane reacts with chlorine in the presence of ultraviolet light. Which products are formed? A Cl CH2CH2Cl and H2 B 2CH3Cl and H2 C C2H5Cl and HCl D CH2=CH2 and 2HCl

Accepted Answer

C

Question 36

36 Ethanol can be made by the fermentation of aqueous glucose and by the catalytic addition of steam to ethene. What are two advantages of making ethanol by the catalytic addition of steam to ethene rather than by the fermentation of aqueous glucose? A faster reaction and renewable raw materials B purer product and faster reaction C renewable raw materials and continuous process D uses more energy and forms a purer product

Accepted Answer

B

Question 37

37 The structure of a polymer repeat unit is shown. H H H O H H N C C N C C C C H H H H H O n Which pair of monomers is used to make this polymer? monomer 1 monomer 2 H H H H H O O H A N C C N C C H H H H O O H H H H H O H H O H B N C C N C C C C H H H H O H H O H H H H H H H O O H C N C C C C N C C H H H H H H O O H H H H H H H O H H O H D N C C C C N C C C C H H H H H H O H H O

Accepted Answer

B

Question 38

38 Which item of apparatus is used to measure exactly 26.3 cm3 of a liquid? A B C D

Accepted Answer

A

Question 39

39 A mixture containing an aqueous salt and an insoluble salt is filtered. X Y Which row describes X and Y? X Y A solute pure water B solute filtrate C residue pure water D residue filtrate

Accepted Answer

D

Question 40

40 Pure ethanol has a melting point of –114 °C and a boiling point of 78 °C. What are the melting and boiling points of a sample of ethanol with glucose dissolved in it? melting boiling point / °C point / °C A –116 77 B –116 79 C –112 77 D –112 79

Accepted Answer

B

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · An ice cube melts

Q2 · A sample of a liquid, X, is heated to a temperature above its boiling point

Q3 · Which row gives the number of protons, electrons and neutrons in an atom of zinc?

Q4 · Which particles have the electronic configuration 2,8,8?

Q5 · A sample of element Q has two isotopes

Q6 · Which statement about silicon(IV) oxide, SiO2, is correct?

Q7 · When 65 g of zinc reacts with 32 g of sulfur, 97 g of zinc sulfide is produced

Q8 · Aluminium reacts with iron(III) oxide to form aluminium oxide and iron

Q9 · The concentration of a solution of aqueous sodium hydroxide is 0.50 mol / dm3

Q10 · Molten zinc oxide is electrolysed using inert electrodes

Q11 · Dilute aqueous sodium chloride is electrolysed using platinum electrodes

Q12 · Hydrogen–oxygen fuel cells can be used to power vehicles

Q13 · A reaction pathway diagram is shown

Q14 · The average bond energy for the C–H bond is 413 kJ / mol

Q15 · Which statement describes the effect of adding a catalyst to a chemical reaction?

Q16 · Which row describes the conditions used in the manufacture of sulfuric acid by the…

Q17 · Which equations show the underlined species acting as a reducing agent?

Q18 · A farmer incorrectly adds two substances to the soil at the same time

Q19 · Which row shows the equations for the dissociation of hydrochloric acid and of ethanoic…

Q20 · Which three oxides are all acidic?

Q21 · The table shows some properties of noble gases

Q22 · Sodium is a Group I metal

Q23 · Tennessine (atomic number 117) is a manufactured element that is below astatine in Group…

Q24 · When chlorine is bubbled into aqueous sodium bromide, a displacement reaction occurs

Q25 · Brass is an alloy of copper

Q26 · The ionic equations for some reactions between metals and aqueous metal ions are shown

Q27 · Zinc is used to galvanise iron to prevent it from rusting

Q28 · Which equation represents a reaction that occurs in a blast furnace during the extraction…

Q29 · Water is added separately to anhydrous copper(II) sulfate and to anhydrous cobalt(II)…

Q30 · Gases which cause acid rain form in car engines

Q31 · Which statements about carbon dioxide are correct?

Q32 · What is the structural formula of butan-2-ol?

Q33 · Methanol reacts with ethanoic acid to form an ester

Q34 · Petroleum can be separated into useful fractions by fractional distillation

Q35 · Ethane reacts with chlorine in the presence of ultraviolet light

Q36 · Ethanol can be made by the fermentation of aqueous glucose and by the catalytic addition…

Q37 · The structure of a polymer repeat unit is shown

Q38 · Which item of apparatus is used to measure exactly 26.3 cm3 of a liquid?

Q39 · A mixture containing an aqueous salt and an insoluble salt is filtered

Q40 · Pure ethanol has a melting point of –114 °C and a boiling point of 78 °C

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