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state / describe / explain
Recall and explain
state: give a concise answer. describe: give the features or what happens. explain: give reasons and connect them to evidence.
Answer from memory. (a) State the melting point and the boiling point of pure water at standard atmospheric pressure. (b) Ice at 0 °C is heated until it has all melted. Describe what happens to its temperature, and explain where the energy goes. (c) Describe condensation in terms of particles. (d) Describe solidification in terms of particles. (e) Ice at −20 °C is heated steadily until the water boils. Describe the shape of its heating curve, and say what is happening along each level part.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Melting and boiling, with the melting and boiling points of water at standard atmospheric pressure (2.2.3.1, 2.2.3.2); condensation and solidification in terms of particles (2.2.3.3); evaporation as the escape of more energetic particles from the surface of a liquid (2.2.3.4); how evaporation causes cooling of a liquid (2.2.3.5); the differences between boiling and evaporation (2.2.3.6); how temperature, surface area and air movement over a surface affect evaporation (2.2.3.7); how the cooling of an object in contact with an evaporating liquid happens (2.2.3.8). Specific heat capacity is in SHC01; conduction, convection and radiation are in TRANS01.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus