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1. Fractional distillation is used to separate crude oil into fractions - Edexcel - GCSE Chemistry - Question 1 - 2012 - Paper 1
Question 1
1. Fractional distillation is used to separate crude oil into fractions. A fractionating column is used for the process. The diagram shows a fractionating colu... show full transcript
Worked Solution & Example Answer:1. Fractional distillation is used to separate crude oil into fractions - Edexcel - GCSE Chemistry - Question 1 - 2012 - Paper 1
Step 1
Which of the following statements is true?
Answer
The correct statement is:
C Molecules in diesel are larger than molecules in petrol.
This can be verified by understanding the molecular structures of the hydrocarbons involved. Diesel is composed of longer-chain hydrocarbons compared to petrol.
Step 2
Explain what is meant by cracking.
Answer
Cracking is a chemical process used to break down larger hydrocarbon molecules into smaller, more useful alkenes and alkanes. This is typically done by heating the larger hydrocarbons in the presence of a catalyst or by applying high temperatures and pressures. The smaller molecules produced, such as ethene and propene, are important for creating various chemicals and fuels.