International A Level (IAL)ChemistryEdexcelExam Questions2. Energetics, Group Chemistry, Halogenoalkanes & AlcoholsIntermolecular Forces

Intermolecular Forces (Edexcel International A Level (IAL) Chemistry): Exam Questions

Exam code: YCH11

32 mins13 questions

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Intermolecular Forces

1a
6 marks

This question is about the forces between molecules and ions.

Some data for three small molecules are shown.

Molecule

Mr

Boiling temperature / °C

Fluorine

38.0

−188

Hydrogen chloride

36.5

−85

Methanol

32.0

65

Explain the large variation in boiling temperatures, given the small range in Mr values.

Detailed descriptions of the forces involved are not required.

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1b
2 marks

Calcium chloride is soluble in water.

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q20b-paper-2-june-2021-edexcel-ial-chemistry

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1c
2 marks

Explain why bromine is a liquid but iodine is a solid at room temperature.

Detailed explanations of the forces involved are not required.

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2a
2 marks

This question is about intermolecular forces.

State what is meant by the term hydrogen bonding.

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2b
2 marks

Draw a diagram to show a hydrogen bond between two molecules of propan-1-ol. Your diagram must clearly show the relative positions of the atoms involved, any relevant dipoles, and the lone pair on the acceptor atom.

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2c
6 marks

(*) The boiling points of the three compounds are shown below.

Compound

Boiling point / °C

Butane

–1

Methoxyethane

+8

Propan-1-ol

+97

Compare and explain the boiling points of butane, methoxyethane and propan-1-ol.

In your answer, you should include:

  • the types of intermolecular force present in each compound

  • the relative strengths of these forces and how they account for the boiling-point trend

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