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CAIE IGCSE Physics 2.2.3.1 Melting and Boiling in Terms of Energy Questions

Practise CAIE IGCSE Physics questions on energy transfer during melting and boiling, linking constant temperature to particle separation rather than a rise in kinetic energy.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Recognise that energy is absorbed during melting or boiling while the temperature remains constant.
  • Explain that supplied energy separates particles or overcomes attractive forces rather than increasing their average kinetic energy.

CAIE IGCSE Physics 2.2.3.1 Melting and Boiling in Terms of Energy Questions question 1

[Maximum number: 5]

Question (a)

(a)

Define specific latent heat of vaporisation.

[ 2 ]

Question (b)

(b)

Fig. 5.1 shows an insulating beaker, crushed ice, an immersion heater and a thermometer.

Fig. 5.1

Fig. 5.1

The initial temperature of the ice is −60∘C-60^{\circ} \mathrm{C}.
The immersion heater is switched on and the temperature is recorded at equal intervals of time.
Fig. 5.2 shows the temperature-time graph.

Fig. 5.2

Fig. 5.2

Describe what occurs in each of the sections A, B, C and D.
A

B
C

D

[ 3 ]
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