plumiCracking: Edexcel GCSE Combined Science questions
Every Edexcel GCSE Combined Science exam question on Cracking (specification points 8.15–8.17), 2018–2025, with its mark scheme and examiner’s report.
Paper
All papers
Exam
All years
Calculations
Q6(b)
The whole paper ↗Q6(b)
The whole paper ↗Q4(c)
The whole paper ↗Q4(d)(i)
The whole paper ↗Q4(d)(ii)
The whole paper ↗Q4(d)(i)
The whole paper ↗Q4(d)(ii)
The whole paper ↗Q4(d)(iii)
The whole paper ↗Q3(d)
The whole paper ↗
All 9 questions on Cracking, as a list
- June 2023, Chemistry Paper 2 Higher, Q6(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
- November 2021, Chemistry Paper 2 Higher, Q6(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
- November 2020, Chemistry Paper 2 Foundation, Q4(c) (1 mark): When crude oil is fractionally distilled, the demand for some fractions is more than the amount produced. Figure 8 shows the relative amounts of each fraction i
- November 2020, Chemistry Paper 2 Foundation, Q4(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
- November 2020, Chemistry Paper 2 Foundation, Q4(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
- June 2018, Chemistry Paper 2 Higher, Q4(d)(i) (1 mark): Use the information in Figure 5 to give the name of the fraction that is most likely to need to be cracked. (1)
- June 2018, Chemistry Paper 2 Higher, Q4(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
- June 2018, Chemistry Paper 2 Higher, Q4(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
- June 2018, Chemistry Paper 2 Foundation, Q3(d) (1 mark): When crude oil is separated into fractions, the amount of each fraction obtained rarely matches the demand for that fraction. Figure 4 shows the relative amount
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