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IB Chemistry HL 2.2.9 Intermolecular Force Strength Question Bank

Practise IB Chemistry HL 2.2.9 by comparing competing intermolecular forces and using molecular mass, polarity and hydrogen bonding to explain property trends.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • rank related substances by intermolecular-force type, size and molecular surface area
  • explain a phase-change trend by the energy needed to overcome forces between molecules
  • justify solubility by comparing the interactions formed with those broken during mixing

2.2.9—IMF strength and properties 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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