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IB Chemistry HL 2.2.9 Imf Strength and Properties Questions

Use exam questions to compare intermolecular-force strength, molecular size and interactions formed or broken during phase changes and mixing.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

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.

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

IB Chemistry HL 2.2.9 Imf Strength and Properties Questions question 1

[Maximum number: 1]

Urea, (H2 N)2CO\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}, is excreted by mammals and can be used as a fertilizer.

Suggest one reason why urea is a solid and ammonia a gas at room temperature.

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