plumiAlkenes: Edexcel International GCSE Chemistry questions
Every Edexcel International GCSE Chemistry exam question on Alkenes (specification points 4.23–4.28), 2019–2025, with its mark scheme and examiner’s report.
Paper
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Calculations
Q9(c)
The whole paper ↗Q10(a)(i)
The whole paper ↗Q10(a)(iii)
The whole paper ↗Q10(b)(iii)
The whole paper ↗Q8(a)(ii)
The whole paper ↗Q8(b)
The whole paper ↗Q5(d)
The whole paper ↗Q5(e)
The whole paper ↗Q4(b)(i)
The whole paper ↗Q4(c)(ii)
The whole paper ↗Q4(c)(iii)
The whole paper ↗Q10(a)(i)
The whole paper ↗Q2(b)
The whole paper ↗Q4(b)(ii)
The whole paper ↗Q4(b)(iii)
The whole paper ↗Q5(b)
The whole paper ↗Q7(c)
The whole paper ↗Your answerQ8(a)(iii)
The whole paper ↗Q1(a)(ii)
The whole paper ↗Q1(b)
The whole paper ↗
All 41 questions on Alkenes, as a list
- June 2025, Paper 1, Q9(c) (5 marks): Ethane and ethene undergo different types of reaction with bromine. Describe the differences between these two reactions. (5)
- November 2024, Paper 1, Q10(a)(i) (1 mark): Give a reason why ethane does not undergo an addition reaction with bromine. (1)
- November 2024, Paper 1, Q10(a)(iii) (1 mark): Give the colour change that occurs when ethene reacts with bromine water. (1)
- November 2024, Paper 1, Q10(b)(iii) (1 mark): Draw the displayed formula of another alkene that is an isomer of these two alkenes. (1)
- June 2024, Paper 1, Q8(a)(ii) (2 marks): The displayed formula of one of the isomers of the alkene is shown. H H H H H C C C C H H H Draw displayed formulae for two other alkene isomers with the molecu
- June 2024, Paper 1, Q8(b) (1 mark): But-1-ene reacts with bromine to form a compound with molecular formula C4H8Br2 What is the name given to this type of reaction? (1) A addition B combustion C d
- November 2023, Paper 1, Q5(d) (2 marks): State what you would observe when ethane and ethene are added separately to two samples of bromine water. (2) ethane ethene
- November 2023, Paper 1, Q5(e) (3 marks): Explain why straight‑chain alkenes always have the same empirical formula, but straight‑chain alkanes have different empirical formulae. Refer to the molecular
- June 2023, Paper 1, Q4(b)(i) (1 mark): State why the empirical formula of all alkenes in this homologous series is CH2 (1)
- June 2023, Paper 1, Q4(c)(ii) (3 marks): Explain why this compound is an unsaturated hydrocarbon. (3)
- June 2023, Paper 1, Q4(c)(iii) (2 marks): Describe a test to show that this hydrocarbon is unsaturated. (2)
- June 2023 (R), Paper 1, Q10(a)(i) (2 marks): The structural formula of propene is CH3CH CH2 Complete the dot-and-cross diagram for a molecule of propene. (2) H H H H C C C H H
- June 2023 (R), Paper 2, Q2(b) (2 marks): Describe a test to show that a colourless liquid is an alkene. (2)
- January 2023, Paper 2, Q4(b)(ii) (3 marks): Ethene is obtained by cracking. This is the displayed formula of ethene. H H C C H H Explain why ethene is described as an unsaturated hydrocarbon. (3)
- January 2023, Paper 2, Q4(b)(iii) (2 marks): Describe a test to show that ethene is unsaturated. (2)
- June 2022, Paper 1, Q5(b) (5 marks): Ethane (C2H6) and ethene (C2H4) both react with bromine. Describe the differences in the reactions of ethane and ethene with bromine. Refer to the conditions, t
- June 2022 (R), Paper 1, Q7(c) (1 mark): This is the equation for one of the reactions that may occur during process 3. H H H H C C + Cl2 H C C H H H Cl Cl What is the name of this type of reaction? (1
- January 2022, Paper 1, Q8(a)(iii) (1 mark): Name compound E. (1)
- January 2022, Paper 2, Q1(a)(ii) (1 mark): Give the reason why ethene is described as unsaturated. (1)
- January 2022, Paper 2, Q1(b) (1 mark): Ethene is bubbled through bromine water until there is no further colour change. Which of these is the appearance of the solution formed? (1) A colourless B ora
- January 2022 (R), Paper 1, Q6(c) (3 marks): The displayed formula of ocimene is H H H C H H C H H H H H H H H C C C C C C C C H H H Explain why ocimene is described as an unsaturated hydrocarbon. (3)
- January 2022 (R), Paper 1, Q6(d)(i) (1 mark): Which of these types of reaction occurs between ocimene and bromine? (1) A addition B polymerisation C precipitation D substitution
- January 2022 (R), Paper 1, Q6(d)(ii) (1 mark): Many alkenes have the general formula CnH2n Suggest why ocimene does not have this general formula. (1)
- November 2021, Paper 1, Q6(a)(v) (1 mark): Give the displayed formula of an alkene that is an isomer of compound X. (1)
- June 2021, Paper 1, Q5(b)(i) (1 mark): What is the name of this type of reaction? (1) A addition B decomposition C precipitation D substitution
- June 2021, Paper 1, Q5(b)(ii) (2 marks): Draw displayed formulae for two different alkenes with the molecular formula C4H8 (2) alkene 1 alkene 2
- January 2021 (R), Paper 1, Q8(a)(ii) (2 marks): Organic compound Q reacts with bromine, without the presence of ultraviolet radiation, to form the compound C4H8Br2 Draw the displayed formulae of two isomers o
- January 2021 (R), Paper 1, Q8(b)(i) (2 marks): A student describes the molecule as an unsaturated hydrocarbon. Explain whether this is a correct description. (2)
- November 2020, Paper 2, Q5(a) (3 marks): Explain why butadiene is described as an unsaturated hydrocarbon. (3)
- November 2020, Paper 2, Q5(b)(i) (1 mark): Butadiene reacts with bromine water. State the colour change that occurs during this reaction. (1) from to
- November 2020 (R), Paper 1, Q3(b)(i) (1 mark): State what is meant by the term unsaturated. (1)
- November 2020 (R), Paper 1, Q3(b)(ii) (2 marks): Describe a test to show that a compound is unsaturated. (2)
- January 2020, Paper 1, Q5(b) (3 marks): Describe a test that can be used to distinguish between compounds Q and T. (3) test result with compound Q result with compound T
- January 2020, Paper 1, Q5(d)(i) (1 mark): Give the name of alkene V. (1)
- January 2020, Paper 1, Q5(d)(ii) (1 mark): Draw the displayed formula of another alkene that is an isomer of alkene V. (1)
- June 2019, Paper 1, Q8(c)(i) (1 mark): State why chloroethene is described as an unsaturated compound. (1)
- June 2019, Paper 1, Q8(c)(ii) (2 marks): Describe a test to show that chloroethene is unsaturated. (2)
- June 2019 (R), Paper 1, Q4(c)(i) (1 mark): Give the general formula for the alkenes. (1)
- June 2019 (R), Paper 1, Q4(c)(ii) (1 mark): State the meaning of the term unsaturated. (1)
- June 2019 (R), Paper 1, Q4(c)(iii) (2 marks): Describe a test to show that a hydrocarbon is unsaturated. (2)
- June 2019 (R), Paper 1, Q6(b)(iv) (1 mark): What type of reaction occurs in stage 1 between ethene and chlorine? (1) A addition B displacement C neutralisation D substitution
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