Part 1 of 3

Melting and boiling

identify / explain

Try it yourself

identify: name or select. explain: give reasons and connect them to evidence.

A beaker holds a mixture of ice and water at 0 °C. It is heated gently and stirred. While there is still some ice in the beaker, the thermometer stays at 0 °C. Which statement explains this? Then explain your choice.

Choose one answera.No energy goes into the beaker until all the ice has meltedb.The energy separates the particles, breaking them out of their fixed positions, so they do not move faster on averagec.The ice is so cold that it cancels out the energy from the heaterd.The thermometer cannot read above 0 °C while ice is touching it

Why?

Your saved work

Answers and earlier attempts stay in this browser. Export a copy to keep, to move to another device or to hand to your teacher. Importing a copy keeps your current answers and adds earlier attempts.

Import saved work

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