IB Chemistry SL 2.2.9 Intermolecular Forces and Properties

Practise explaining volatility, boiling point, melting point and solubility through the type and strength of intermolecular forces. Separate molecular size and shape effects from…

Syllabus
First assessment 2025
Objective
2.2.9
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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