plumiFuels from crude oil: cracking and reforming: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 4.B.2 Fuels from crude oil: cracking and reforming, 2019–2025, with mark schemes and examiner’s reports where available.
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All 24 questions on Fuels from crude oil: cracking and reforming, as a list
- June 2025, AS Unit 1, Q13 (1 mark): Which type of reaction occurs when an alkane is cracked? A combustion B hydrolysis C neutralisation D thermal decomposition
- June 2025, AS Unit 1, Q15 (1 mark): One molecule of a hydrocarbon is cracked to form two molecules of ethene, two molecules of propene and one molecule of propane. What is the molecular formula of
- January 2025, AS Unit 1, Q16 (1 mark): Which statement about the cracking of crude oil is true? The cracking of crude oil A separates the mixture into pure compounds B separates the mixture into frac
- October 2024, AS Unit 1, Q18(b)(i) (1 mark): Name the technique that could be used for this separation. (1)
- October 2024, AS Unit 1, Q18(b)(ii) (2 marks): Describe how this technique separates isooctane from octane. (2)
- January 2024, AS Unit 1, Q16 (1 mark): Which mixture could be formed when a single molecule of C12H26 is cracked? A butene, pentane and propene B hexane, butene and ethane C nonane and ethene D prope
- October 2023, AS Unit 1, Q19(c)(i) (1 mark): Write the equation for this reaction using molecular formulae. State symbols are not required. (1)
- October 2023, AS Unit 1, Q19(c)(ii) (1 mark): Draw the structure of the cyclic hydrocarbon formed in this reaction. (1)
- January 2023, AS Unit 1, Q21(a)(ii) (1 mark): Name the industrial process used to produce X from the straight‑chain isomer. (1)
- January 2023, AS Unit 1, Q23(a) (1 mark): Suggest one difference between the fractional distillation of air and of crude oil. (1)
- October 2022, AS Unit 1, Q15(a)(ii) (1 mark): Name the industrial process used to convert octane into iso‑octane. (1)
- October 2022, AS Unit 1, Q15(a)(iii) (1 mark): Give a reason why petrol needs a high proportion of iso‑octane. (1)
- January 2022, AS Unit 1, Q12 (1 mark): A single molecule of decane, C10H22 , is cracked. Which of these mixtures could not be formed? A pentene and pentane B ethene, butene and butane C propene, prop
- October 2021, AS Unit 1, Q15(a) (2 marks): Describe how a sample of octadecane can be obtained from a mixture of alkanes. (2)
- October 2021, AS Unit 1, Q15(b)(i) (1 mark): Octadecane can be cracked to produce butene and one other product. Complete the equation. State symbols are not required. C18H38 → 2C4H8 + (1)
- June 2021, AS Unit 1, Q13 (1 mark): When C20H42 is cracked, each molecule produces one molecule of ethene, one molecule of butane and two molecules of hydrocarbon E. What is the molecular formula
- June 2021, AS Unit 1, Q21(b)(i) (2 marks): Draw the skeletal formulae of a branched-chain alkane and a cycloalkane, each containing seven carbon atoms. (2) Branched-chain alkane Cycloalkane
- June 2021, AS Unit 1, Q21(b)(ii) (1 mark): Write the equation for the reforming of heptane into a cycloalkane. Use molecular formulae. (1)
- June 2021, AS Unit 1, Q21(b)(iii) (1 mark): Give a reason for adding cycloalkanes to petrol. (1) .
- January 2021, AS Unit 1, Q21(d)(i) (1 mark): Suggest the name of a suitable technique to obtain squalene from shark liver oil. (1)
- January 2020, AS Unit 1, Q14 (1 mark): Some equations for reactions used in reforming crude oil fractions are shown. Which equation is not balanced? A o B o + H2 C o + 3H2 D o + 3H2
- June 2019, AS Unit 1, Q22(c)(i) (1 mark): Name this process. (1)
- January 2019, AS Unit 1, Q21(a)(i) (1 mark): Give a reason why petrol should not contain a high proportion of heptane. (1)
- January 2019, AS Unit 1, Q21(a)(iii) (1 mark): Write the equation for reforming heptane into cycloheptane. Use molecular formulae. State symbols are not required. (1)
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