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

Use marked Edexcel IAL Chemistry questions to predict boiling and melting temperatures from chain length, branching, molecular contact area, London forces and hydrogen bonding.

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.

[Maximum number: 2]

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

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

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