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IB Chemistry SL 2.2.9 Imf Strength and Properties Questions

Use exam questions to connect intermolecular-force strength and molar mass with volatility, phase changes and solubility.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Rank related covalent substances by intermolecular-force type, molecular size, electron count and contact surface.
  • Explain a volatility, boiling-point, melting-point or vapour-pressure trend by the energy needed to overcome the relevant intermolecular forces.
  • Justify solubility or miscibility by comparing the interactions formed with the interactions broken during mixing.

Learn this topic

Study 2.2.9—IMF strength and properties conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 2.2.9 Imf Strength and Properties Questions question 1

[Maximum number: 2]

Phosphorus is an element that is an essential part of the biological molecules involved in both respiration and photosynthesis.

7.75 g of phosphorus was combusted in a limited supply of oxygen, the mass of the oxide produced was 13.75 g .

This oxide of phosphorus has a melting point of 296.9 K .

Outline, with reference to structure and bonding, the reasons why the melting point of this oxide is low.

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