Alkenes — Paper 1 · IGCSE Science - Combined 0653

15 Which diagrams show the bonding in the molecules of carbon dioxide and ethene? carbon dioxide ethene H H A O C O C C H H H H B O C O H C C H H H H H C O C O C C H H H H D O C O H C C H H H

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2005

27 Some man-made polymers, for example, poly(ethene), are made from monomers that join together by forming carbon-to-carbon bonds. From what source are the monomers obtained and what type of carbon-to-carbon bonds form? source of carbon-to-carbon bonds monomers A coal covalent B coal ionic C oil covalent D oil ionic

1 marks

Answer: C

This question in 0653/11 May/June 2006

16 Which gases have covalent molecules that contain one or more double bonds? carbon dioxide ethene hydrogen chloride A v v v B v v x Cc x v v D x x v

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2008

25 Which equation shows the complete combustion of a hydrocarbon? A C2H4 + 2O2 → 2CO + 2H2O B C2H4 + 3O2 → 2CO2 + 2H2O C C2H6O + 2O2 → 2CO + 3H2O D C2H6O + 3O2 → 2CO2 + 3H2O

1 marks

Answer: B

This question in 0653/11 May/June 2009

23 Which structure shows a polymer that is also a hydrocarbon? A B C D H H H H H H H H H Cl H Cl H C C H C C C C C C C C C C H H H H H H H H H H H H

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2010

24 Ethene burns as shown. C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) What happens to ethene in this reaction? A decomposition B neutralisation C oxidation D reduction

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2011

22 Ethene burns as shown. C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) What happens to ethene in this reaction? A decomposition B neutralisation C oxidation D reduction

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2011

27 Which statement about organic compounds is not correct? A An ethene molecule contains a double bond. B Molecules of ethane and ethanol contain the same number of carbon atoms. C The complete combustion of hydrocarbons produces carbon dioxide and water. D The main constituent of natural gas is ethane.

1 marks

Answer: D

This question in 0653/11 May/June 2018

27 P, Q, R and S are four hydrocarbons. P is unsaturated. Q contains only single covalent bonds. R undergoes addition polymerisation. S decolourises bromine water. Which row identifies these hydrocarbons? P Q R S A alkane alkene alkane alkane B alkene alkane alkane alkene C alkene alkane alkene alkane D alkene alkane alkene alkene

1 marks

Answer: D

This question in 0653/12 Feb/March 2019

27 Which substances react together? 1 ethene and methane 2 ethene and bromine 3 ethene and oxygen A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0653/13 May/June 2019

27 Which statement about hydrocarbons is correct? A Alkanes are produced by cracking alkenes. B Alkanes decolourise bromine water. C Alkenes are saturated hydrocarbons. D Alkenes contain a double bond.

1 marks

Answer: D

This question in 0653/12 Feb/March 2021

27 Which statement about ethene is not correct? A It is used to make an addition polymer. B It decolourises aqueous bromine. C It is a saturated hydrocarbon. D It is formed by cracking larger alkanes.

1 marks

Answer: C

This question in 0653/11 May/June 2021

27 Which process produces alkenes? A cracking B fractional distillation C polymerisation D reduction

1 marks

Answer: A

This question in 0653/12 May/June 2021

27 Which substance turns aqueous bromine colourless? A an alkane B an alkene C a saturated hydrocarbon D poly(ethene)

1 marks

Answer: B

This question in 0653/13 May/June 2021

26 Which description identifies the monomer that is used to form poly(ethene) by addition polymerisation? A saturated alkane B saturated alkene C unsaturated alkane D unsaturated alkene

1 marks

Answer: D

This question in 0653/12 Feb/March 2022

27 What is produced by cracking? A alkenes B fractions C naphtha D polymers

1 marks

Answer: A

This question in 0653/12 Feb/March 2023

27 Which process is used to make poly(ethene)? A addition polymerisation B cracking C fractional distillation D reacting ethane molecules together

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2023

27 Which process is used to produce alkenes? A addition polymerisation B combustion C cracking D fractional distillation

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2023

27 Which process is used to produce alkenes? A addition polymerisation B combustion C cracking D fractional distillation

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2023

27 Which statement about hydrocarbons is correct? A Alkanes rapidly decolourise bromine water. B Alkanes are unsaturated hydrocarbons. C Alkenes have double covalent bonds. D Alkenes are the main constituent of natural gas.

1 marks

Answer: C

This question in 0653/12 Feb/March 2024

27 Which statement about alkenes is correct? A They are manufactured in addition polymerisation reactions. B They react with aqueous bromine to give colourless products. C They are compounds containing carbon, hydrogen and oxygen. D They are cracked to produce other compounds.

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2024

27 Which statement about alkenes is correct? A They are manufactured in addition polymerisation reactions. B They react with aqueous bromine to give colourless products. C They are compounds containing carbon, hydrogen and oxygen. D They are cracked to produce other compounds.

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2024

26 Which statement about alkenes is correct? A They are less reactive than alkanes. B They are unsaturated compounds. C They are polymers. D They turn aqueous bromine orange-brown.

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2025

26 The structures of molecules W, X, Y and Z are shown. H H H H H H H Cl C C C C H C C H C C H CH3 H H H H H H W X Y Z Which molecules are unsaturated hydrocarbons? A W, X and Y B W, X and Z C W and X only D Y and Z only

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2025

26 The structures of molecules W, X, Y and Z are shown. H H H H H H H Cl C C C C H C C H C C H CH3 H H H H H H W X Y Z Which molecules are unsaturated hydrocarbons? A W, X and Y B W, X and Z C W and X only D Y and Z only

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2025