Liquid water at 100∘C100^\circ\text{C}100∘C boils to form steam at 100∘C100^\circ\text{C}100∘C.
What happens to the average separation and the average speed of the water molecules?
Average separation decreases; average speed decreases
Average separation decreases; average speed remains the same
Average separation increases; average speed decreases
Average separation increases; average speed remains the same
313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.