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Edexcel IGCSE Chemistry 4.18 why cracking is needed

Edexcel IGCSE Chemistry 4.18 why cracking is needed
Edexcel IGCSE Chemistry syllabusChemistry 4CH1First assessment 2019

Practise cracking-need questions by linking long-chain fraction surplus to short-chain fuel demand and alkene production for polymers.

How this is tested

  • Explain that surplus long-chain fractions are cracked because shorter alkanes are in higher demand.
  • Link shorter-chain alkanes to better fuels because they are more flammable than longer chains.
  • Explain that cracking also produces alkenes used to make addition polymers.

Question 9(c)(ii)

[Maximum number: 3]

This question is about products from crude oil.

The equation shows the cracking of a hydrocarbon produced from the fractional distillation of crude oil.

C10H22→C8H18+C2H4\mathrm{C}_{10} \mathrm{H}_{22} \rightarrow \mathrm{C}_{8} \mathrm{H}_{18}+\mathrm{C}_{2} \mathrm{H}_{4}

Explain why cracking is a useful process in the oil industry.