Particle Model of MatterAQA GCSE Physics (8463)

Changes of State and the Particle Model

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

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1
A 200 g object has a volume of 50 cm³. Density?
Answer & explanation
Correct: option B
ρ = 200/50 = 4 g/cm³.
2
1 g/cm³ equals:
Answer & explanation
Correct: option C
1 g/cm³ = 1000 kg/m³ (the density of water).
3
Best method for the volume of an irregular pebble?
Answer & explanation
Correct: option C
Irregular shapes use displacement.
4
Which state has the lowest density?
Answer & explanation
Correct: option C
Gas particles are far apart, so density ≈ 1000× smaller than liquids/solids.
5
Why does ice float?
Answer & explanation
Correct: option B
Ice density (~920 kg/m³) < water (1000 kg/m³).
6
5 cm³ of mercury weighs 67.5 g. Density?
Answer & explanation
Correct: option B
ρ = 67.5/5 = 13.5 g/cm³ — matches mercury.