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IB Chemistry HL 3.2.4 Physical Property Trends Questions

Use real exam questions to compare physical properties and justify melting or boiling trends from molecular size, branching, polarity and intermolecular forces.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Rank or compare boiling points using molecular size, chain length, branching, polarity and the strength of intermolecular forces.
  • Rank or compare melting points using saturation/unsaturation, cis/trans shape, chain length and molecular packing.
  • Explain a stated physical-property trend by linking molecular structure to London dispersion, hydrogen bonding, dipole interactions or packing efficiency.

Learn this topic

Study 3.2.4—Physical property trends conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.2.4 Physical Property Trends Questions question 1

[Maximum number: 2]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question IB Chemistry HL 3.2.4 Physical Property Trends Questions question 1 — IB Chemistry HL

In the gas phase, A reacts with hydrogen to form D :

Figure for Question IB Chemistry HL 3.2.4 Physical Property Trends Questions question 1 — IB Chemistry HL

Compound D is isomeric with hexane. Predict, giving reasons, how the boiling points of these compounds would compare.

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