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Cracking: Edexcel GCSE Chemistry questions

Every Edexcel GCSE Chemistry exam question on Cracking (specification points 8.15–8.17), 2018–2025, with its mark scheme and examiner’s report.

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1,880 questions

  1. Q9(b)

    June 2023 · Paper 2 Higher

    4 marksCracking
    The whole paper ↗
    June 2023 Paper 2 Higher, question 9(b): Hydrocarbon X was cracked to form one molecule of hexane, C6H14 , and one molecule of alkene Y. X → C6H14 + Y The relative formula mass of Y is 56. The empirica

  2. Q9(b)

    November 2021 · Paper 2 Higher

    1 markCracking
    The whole paper ↗
    November 2021 Paper 2 Higher, question 9(b): 1 mole of pentadecane can be cracked to form 1 mole of octane, C8H18 , and 1 mole of propene, C3H6 , and 2 moles of another product. Complete the balanced equat

  3. Q6(c)

    November 2020 · Paper 2 Foundation

    1 markCracking
    The whole paper ↗
    November 2020 Paper 2 Foundation, question 6(c): When crude oil is fractionally distilled, the demand for some fractions is more than the amount produced. Figure 11 shows the relative amounts of each fraction

  4. Q6(d)(i)

    November 2020 · Paper 2 Foundation

    1 markCracking
    The whole paper ↗
    November 2020 Paper 2 Foundation, question 6(d)(i): Octane, C8H18, can be cracked to produce one molecule of ethene, C2H4, and one molecule of CxH14. C8H18 → C2H4 + CxH14 Determine the value of x in the molecule

  5. Q6(d)(ii)

    November 2020 · Paper 2 Foundation

    2 marksCrackingConservation of mass and moles
    The whole paper ↗
    November 2020 Paper 2 Foundation, question 6(d)(ii): Dodecane is a large hydrocarbon molecule. When one molecule of dodecane is cracked the products are one molecule of octane and one molecule of butene. dodecane

  6. Q5(a)(i)

    June 2019 · Paper 2 Foundation

    2 marksCracking
    The whole paper ↗
    June 2019 Paper 2 Foundation, question 5(a)(i): Calculate the values of x and y in CxHy. (2) x = y =

  7. Q5(a)(ii)

    June 2019 · Paper 2 Foundation

    1 markCracking
    The whole paper ↗
    June 2019 Paper 2 Foundation, question 5(a)(ii): State the total mass of products formed if 25 g of decane is cracked in this way. (1)

  8. Q6(d)(i)

    June 2018 · Paper 2 Higher

    1 markCracking
    The whole paper ↗
    June 2018 Paper 2 Higher, question 6(d)(i): Use the information in Figure 9 to give the name of the fraction that is most likely to need to be cracked. (1)

  9. Q6(d)(ii)

    June 2018 · Paper 2 Higher

    3 marksCrackingEnergy changes in reactions
    The whole paper ↗
    June 2018 Paper 2 Higher, question 6(d)(ii): In a cracking reaction, reactants are heated to form products. This reaction is endothermic. On the axes provided, draw the reaction profile of this reaction. L

  10. Q6(d)(iii)

    June 2018 · Paper 2 Higher

    1 markCracking
    The whole paper ↗
    June 2018 Paper 2 Higher, question 6(d)(iii): Dodecane, C12H26, can be cracked to form useful products. Complete the equation for the cracking of dodecane by filling in the formula of the single molecule ne

  11. Q5(d)

    June 2018 · Paper 2 Foundation

    1 markCracking
    The whole paper ↗
    June 2018 Paper 2 Foundation, question 5(d): When crude oil is separated into fractions, the amount of each fraction obtained rarely matches the demand for that fraction. Figure 7 shows the relative amount

  12. Q3(c)(i)

    Specimen · Paper 2 Higher

    3 marksCracking
    The whole paper ↗
    Specimen Paper 2 Higher, question 3(c)(i): Explain how ethene is produced using the apparatus in Figure 4. (3)

  13. Q3(c)(ii)

    Specimen · Paper 2 Higher

    1 markCracking
    The whole paper ↗
    Specimen Paper 2 Higher, question 3(c)(ii): One molecule of decane produced two molecules of propene, C3H6, and one molecule of product Z. C10H22 → 2C3H6 + product Z What is the formula of product Z? (1)

  14. Q8(d)(i)

    Specimen · Paper 2 Foundation

    3 marksCracking
    The whole paper ↗
    Specimen Paper 2 Foundation, question 8(d)(i): Explain how ethene is produced using the apparatus in Figure 12. (3)

  15. Q8(d)(ii)

    Specimen · Paper 2 Foundation

    1 markCracking
    The whole paper ↗
    Specimen Paper 2 Foundation, question 8(d)(ii): One molecule of decane produced two molecules of propene, C3H6, and one molecule of product Z. C10H22 → 2C3H6 + product Z What is the formula of product Z? (1)
All 15 questions on Cracking, as a list
  1. June 2023, Paper 2 Higher, Q9(b) (4 marks): Hydrocarbon X was cracked to form one molecule of hexane, C6H14 , and one molecule of alkene Y. X → C6H14 + Y The relative formula mass of Y is 56. The empirica
  2. November 2021, Paper 2 Higher, Q9(b) (1 mark): 1 mole of pentadecane can be cracked to form 1 mole of octane, C8H18 , and 1 mole of propene, C3H6 , and 2 moles of another product. Complete the balanced equat
  3. November 2020, Paper 2 Foundation, Q6(c) (1 mark): When crude oil is fractionally distilled, the demand for some fractions is more than the amount produced. Figure 11 shows the relative amounts of each fraction
  4. November 2020, Paper 2 Foundation, Q6(d)(i) (1 mark): Octane, C8H18, can be cracked to produce one molecule of ethene, C2H4, and one molecule of CxH14. C8H18 → C2H4 + CxH14 Determine the value of x in the molecule
  5. November 2020, Paper 2 Foundation, Q6(d)(ii) (2 marks): Dodecane is a large hydrocarbon molecule. When one molecule of dodecane is cracked the products are one molecule of octane and one molecule of butene. dodecane
  6. June 2019, Paper 2 Foundation, Q5(a)(i) (2 marks): Calculate the values of x and y in CxHy. (2) x = y =
  7. June 2019, Paper 2 Foundation, Q5(a)(ii) (1 mark): State the total mass of products formed if 25 g of decane is cracked in this way. (1)
  8. June 2018, Paper 2 Higher, Q6(d)(i) (1 mark): Use the information in Figure 9 to give the name of the fraction that is most likely to need to be cracked. (1)
  9. June 2018, Paper 2 Higher, Q6(d)(ii) (3 marks): In a cracking reaction, reactants are heated to form products. This reaction is endothermic. On the axes provided, draw the reaction profile of this reaction. L
  10. June 2018, Paper 2 Higher, Q6(d)(iii) (1 mark): Dodecane, C12H26, can be cracked to form useful products. Complete the equation for the cracking of dodecane by filling in the formula of the single molecule ne
  11. June 2018, Paper 2 Foundation, Q5(d) (1 mark): When crude oil is separated into fractions, the amount of each fraction obtained rarely matches the demand for that fraction. Figure 7 shows the relative amount
  12. Specimen, Paper 2 Higher, Q3(c)(i) (3 marks): Explain how ethene is produced using the apparatus in Figure 4. (3)
  13. Specimen, Paper 2 Higher, Q3(c)(ii) (1 mark): One molecule of decane produced two molecules of propene, C3H6, and one molecule of product Z. C10H22 → 2C3H6 + product Z What is the formula of product Z? (1)
  14. Specimen, Paper 2 Foundation, Q8(d)(i) (3 marks): Explain how ethene is produced using the apparatus in Figure 12. (3)
  15. Specimen, Paper 2 Foundation, Q8(d)(ii) (1 mark): One molecule of decane produced two molecules of propene, C3H6, and one molecule of product Z. C10H22 → 2C3H6 + product Z What is the formula of product Z? (1)

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