Alkanes — Paper 1 · IGCSE Chemistry (9-1) 0971

37 Which statement about ethane is correct? A It rapidly decolourises aqueous bromine. B It does not burn. C It forms long-chain compounds called polymers. D It only contains single bonds between its atoms.

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2019

37 Which statement describes methane? A It is an alcohol. B It is an unsaturated molecule. C It contains carbon, hydrogen and oxygen atoms only. D Each molecule contains four single covalent bonds.

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2020

39 The structure of propane is shown. H H H H C C C H H H H Which statement about the atoms and the bonding in propane is correct? A All the bonds are single bonds. B Each carbon atom only bonds with two hydrogen atoms. C Propane is an unsaturated molecule. D There are three carbon-carbon bonds.

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2020

36 Which statement about alkanes is correct? A They burn in oxygen. B They contain carbon, hydrogen and oxygen atoms. C They contain double bonds. D They contain ionic bonds.

1 marks

Answer: A

This question in 0971/11 May/June 2021

37 Some properties of colourless liquid L are listed. ● It boils at 65 C. ● When added to water, two layers form which do not mix. ● It does not react with sodium carbonate. ● It has no effect on bromine water. What is L? A ethanol B hexane C hexene D ethanoic acid

1 marks

Answer: B

This question in 0971/11 May/June 2022

36 What is the equation for the complete combustion of methane? A CH4 + 4O2  CO2 + 2H2O B 2CH4 + 3O2  2CO + 4H2O C CH4 + 2O2  CO2 + 2H2O D C2H6 + 3O2  2CO2 + 3H2O

1 marks

Answer: C

This question in 0971/12 May/June 2022

37 Alkenes can be produced by cracking large hydrocarbon molecules to form smaller hydrocarbon molecules. Which equations represent possible reactions when tetradecane, C14H30, is cracked? 1 C14H30  C2H6 + C3H6 + C4H8 + C5H10 2 C14H30  H2 + C2H4 + C3H6 + C4H8 + C5H10 3 C14H30  C2H6 + 4C3H6 4 C14H30  C2H6 + C3H8 + C9H18 A 1 only B 1 and 4 C 1, 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0971/12 May/June 2022

34 Which statement about both ethane and ethanol is correct? A They are hydrocarbons. B They contain oxygen. C They contain the same number of atoms. D They produce water when burned.

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2022

34 Which equation represents the cracking of an alkane? A 3C2H4 → C6H12 B C6H12 + H2 → C6H14 C C6H14 → 6C + 7H2 D C6H14 → C2H4 + C4H10

1 marks

Answer: D

This question in 0971/11 May/June 2023

33 Which formula represents a compound that is a member of the homologous series of alkanes? A C2H4 B C3H6 C C4H8 D C5H12

1 marks

Answer: D

This question in 0971/11 May/June 2024

34 Which statement about ethane is correct? A It rapidly decolourises aqueous bromine. B It does not burn. C It forms long-chain compounds called polymers. D It only contains single bonds between its atoms.

1 marks

Answer: D

This question in 0971/11 May/June 2024

34 The molecular formula of compound Z is C4H10. Which row identifies the substance that reacts with Z and describes the type of reaction that occurs? substance type of reaction A chlorine addition B chlorine substitution C steam addition D steam substitution

1 marks

Answer: B

This question in 0971/11 May/June 2025

10 Which equation represents the complete combustion of butane, C4H10? A 2C4H10 + 5O2  8C + 10H2O B 2C4H10 + 9O2  8CO + 10H2O C 2C4H10 + 13O2  8CO2 + 10H2O D C4H10 + 4O2  4CO2 + 5H2

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2025