Learning objective

Describe the changes in properties of petroleum fractions from the bottom to the top of the fractionating column, including: (a) shorter chain length (b) increased volatility (c) lower boiling points (d) reduced viscosity.

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Exam focus

Cambridge IGCSE ChemistryOrganic chemistryCore content

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Quick explanation

This point belongs to Fuels, especially Fuels outcomes.
You need to be able to describe the changes in properties of petroleum fractions from the bottom to the top of the fractionating column, including: (a) shorter chain length (b) increased volatility (c) lower boiling points (d) reduced viscosity.
The key ideas to know are Describe.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

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This objective helps connect Fuels outcomes to exam-style questions, flashcards, and revision notes for Fuels.

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Paper 3Theory (Core)1 marks

Description

As crude oil is heated and passed through a fractionating column, various fractions are collected at different heights.

a
State the trend in boiling points of petroleum fractions from the bottom to the top of the column.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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