Alkanes — Paper 2 · IGCSE Science - Combined 0653

27 Butane, C4H10, and decane, C10H22, are alkanes. Molecules of decane are larger than molecules of butane. Which row describes the properties of decane compared to those of butane? intermolecular boiling point attractive forces A higher stronger B higher weaker C lower stronger D lower weaker

1 marks

Answer: A

This question in 0653/21 May/June 2018

26 Which statement about alkanes is not correct? A Alkanes are unsaturated hydrocarbons. B Alkanes burn to release heat energy. C Alkanes form carbon dioxide and water when they burn. D Alkane molecules contain only single bonds.

1 marks

Answer: A

This question in 0653/21 May/June 2019

26 Which statement about alkanes is correct? A Alkanes are compounds containing carbon, hydrogen and oxygen. B Alkanes are saturated hydrocarbons. C Ethane is used to make poly(ethene). D Methane is the only alkane that does not contain a double bond.

1 marks

Answer: B

This question in 0653/22 May/June 2019

27 Which row identifies the temperature used and describes the change to the alkane molecules during the cracking process? temperature change to the / °C alkane molecules A 100 become larger B 100 become smaller C 500 become larger D 500 become smaller

1 marks

Answer: D

This question in 0653/22 May/June 2019

27 What is a typical property of alkanes? A They are catalysts. B They burn in air. C They can be neutralised. D They react endothermically.

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2019

27 In which list are all of the hydrocarbons in the same homologous series? A CH4, C2H6, C3H8, C5H10 B C2H4, C2H6, C3H6, C4H8 C C2H4, C3H6, C4H8, C5H10 D C2H6, C3H6, C4H8, C5H10

1 marks

Answer: C

This question in 0653/22 May/June 2020

27 Which statement about hydrocarbons is not correct? A Alkenes are made by cracking alkanes. B Butene decolourises aqueous bromine. C C2H4 is used to make poly(ethene). D The general formula of alkanes is CnH2n.

1 marks

Answer: D

This question in 0653/22 Feb/March 2021

26 Refinery gas contains methane. Which statement about methane is correct? A Its boiling point is high because it has strong forces of attraction between molecules. B Its boiling point is high because it has weak forces of attraction between molecules. C Its boiling point is low because it has strong forces of attraction between molecules. D Its boiling point is low because it has weak forces of attraction between molecules.

1 marks

Answer: D

This question in 0653/22 Feb/March 2022

26 Methane, ethane and propane are all alkanes. Their formulae are shown. methane, CH4 ethane, C2H6 propane, C3H8 Which statement is not correct? A All three compounds are hydrocarbons. B All three compounds burn. C Methane is the main constituent of natural gas. D Propane burns completely to form carbon dioxide and hydrogen.

1 marks

Answer: D

This question in 0653/21 May/June 2022

26 Methane, ethane and propane are all alkanes. Their formulae are shown. methane, CH4 ethane, C2H6 propane, C3H8 Which statement is not correct? A All three compounds are hydrocarbons. B All three compounds burn. C Methane is the main constituent of natural gas. D Propane burns completely to form carbon dioxide and hydrogen.

1 marks

Answer: D

This question in 0653/22 May/June 2022

26 Methane, ethane and propane are all alkanes. Their formulae are shown. methane, CH4 ethane, C2H6 propane, C3H8 Which statement is not correct? A All three compounds are hydrocarbons. B All three compounds burn. C Methane is the main constituent of natural gas. D Propane burns completely to form carbon dioxide and hydrogen.

1 marks

Answer: D

This question in 0653/23 May/June 2022

26 The formula of the hydrocarbon octane is C8H18. What are the products of the complete combustion of octane? A carbon and hydrogen B carbon and water C carbon dioxide and water D carbon monoxide and water

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2022

26 Why are alkanes members of the same homologous series? A They are all hydrocarbons. B They have similar physical properties. C They have the same general formula. D They all undergo combustion to give carbon dioxide and water.

1 marks

Answer: C

This question in 0653/21 May/June 2023

26 Which statement about all alkanes is correct? A They contain the same number of carbon atoms. B They have different chemical properties. C They have the same general formula. D They have the same melting point.

1 marks

Answer: C

This question in 0653/23 May/June 2023

27 Which statement about alkanes is correct? A Their molecules are unsaturated. B They are generally reactive compounds. C They are mixtures of carbon and hydrogen atoms only. D They produce water when they burn.

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2023

27 Decane is an alkane. Which statement about decane is correct? A It burns in air to form carbon dioxide and hydrogen. B It is an unsaturated hydrocarbon. C It only contains single C–C and C–H bonds. D It rapidly decolourises bromine water.

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2023

27 Which statement about alkanes is correct? A They are unsaturated hydrocarbons. B They are very reactive. C They burn to form carbon dioxide and hydrogen. D They contain only single covalent bonds.

1 marks

Answer: D

This question in 0653/23 Oct/Nov 2023

26 Which statements about the alkanes are correct? 1 They are saturated hydrocarbons. 2 They produce carbon monoxide and water during complete combustion. 3 They are generally unreactive, except in terms of burning. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2024

24 Methane, ethane and propane are all members of the same homologous series. Which statement about these compounds is correct? A They contain double carbon–carbon covalent bonds. B They have different general formulas. C They have the same molecular structure. D They react in similar ways.

1 marks

Answer: D

This question in 0653/23 May/June 2025

23 Which equation represents cracking? A C10H22  2C2H4 + C6H12 + H2 B C10H20 + H2  C10H22 C 2C10H22 + 21O2  20CO + 22H2O D 2C10H22 + 31O2  20CO2 + 22H2O

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2025

24 The structures of some compounds are shown. H H H H H H H C H H C C H H C C C H H H H H H H Which statement about these compounds is correct? A They have the same boiling point. B They are in the same homologous series. C They are unsaturated. D They have different chemical properties.

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2025

25 Which statement about methane is correct? A Its increase in the atmosphere contributes to climate change. B It reacts with steam in the presence of an acid catalyst. C It has the molecular formula CH3OH. D It reacts with bromine in an addition reaction.

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2025