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IB Chemistry SL 2.2.9 Intermolecular Force Strength Question Bank

Practise IB Chemistry SL 2.2.9 by ranking intermolecular forces and explaining how molecular size, polarity and hydrogen bonding affect volatility, solubility and properties.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

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: 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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