MYP Physics · 07 · multiple choice
Heating during a change of state
Thermal physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 3
- Topics
- 2
- Answer
- Complete
Pure ice at its melting temperature is heated steadily. Some ice melts, but the temperature remains constant. Which statement best explains the observation?
- A
No energy enters because the temperature is constant.
- B
Energy increases particle potential energy as the solid structure changes.
- C
The particles stop moving while melting.
- D
The energy is destroyed by the phase change.
- a
Select and explain Select the best explanation and distinguish internal energy from temperature.
3 marks
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a
Select and explain Select the best explanation and distinguish internal energy from temperature.
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
Selects option B: melting increases particle potential energy while the structure changes.
- 2
Explains that energy is transferred into the ice even though temperature is constant.
- 3
Explains that the energy changes particle arrangement or potential energy rather than increasing average kinetic energy during melting.
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