IB Physics HL B.1.8 Phase Changes Question Bank
Practise HL phase-change questions on molecular energy, evaporation, boiling and graph interpretation with exam evidence.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
Exam points
- Analyse phase-change graphs and molecular energy to explain constant temperature, latent transfer and bond changes.
- Compare evaporation and boiling using surface area, pressure and molecular-energy distributions.
- Explain why phase-change energy changes intermolecular potential rather than average kinetic energy.
B.1.8—Phase change question 1
[Maximum number: 3]
Explain, in terms of the energy of its molecules, why the temperature of a pure substance does not change during melting.
energy supplied / bonds broken/heat absorbed;
increases potential energy; no change in kinetic energy (so no change in temperature);
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