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Edexcel A-Level Chemistry AS 7.5 Understand in Terms of Intermolecular Forces Physical Properties Shown By Substances Questions

Compare the strongest attractions first, then use electron number or molecular contact area to predict the order and link stronger forces to more energy required.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Predict alkane boiling order from chain length, branching and molecular contact area.
  • Separate London-force trends down a hydride group from hydrogen-bonding anomalies.
  • Compare alcohols with similar-sized molecules by identifying their hydrogen bonding.

Edexcel A-Level Chemistry AS 7.5 Understand in Terms of Intermolecular Forces Physical Properties Shown By Substances Questions question 1

[Maximum number: 2]

This question is about alcohols with the molecular formula C6H14O\mathrm{C}_{6} \mathrm{H}_{14} \mathrm{O}.

Two primary C6H14O\mathrm{C}_{6} \mathrm{H}_{14} \mathrm{O} alcohols, A and B, are shown.

alcohol A

alcohol A

Figure for Question Edexcel A-Level Chemistry AS 7.5 Understand in Terms of Intermolecular Forces Physical Properties Shown By Substances Questions question 1 — Edexcel A-Level Chemistry AS

Explain why alcohol B has a higher boiling temperature than alcohol A.

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