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States of matter questions appear in almost every physics paper. Examined in Edexcel 1PH0/2 (Paper 2). Edexcel uses context-based questions — unusual substances, industrial processes, materials with surprising properties — so practise applying particle model reasoning to unfamiliar state-change scenarios.
- "Explain why the temperature stays constant during melting" (3 marks): Say energy breaks bonds → potential energy increases → kinetic energy stays constant → temperature stays constant.
- Heating curve interpretation (2-3 marks): Identify flat sections (state changes) and sloped sections (within-state heating). Label the melting and boiling points.
- Particle descriptions (3 marks): Describe arrangement, movement, and forces for each state. Always address all three aspects.
- Internal energy questions (2 marks): State that internal energy = kinetic + potential energy of particles.
- "Suggest" questions (Edexcel): Given an unusual state change (e.g. a substance that sublimes at room temperature), suggest why this happens using particle model reasoning.
This exam focus covers Exam Focus within States of Matter for GCSE Physics. Revise States of Matter in Particle Model for GCSE Physics with 13 exam-style questions and 30 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 11 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for States of Matter
In which state of matter are particles arranged in a regular pattern and only vibrate about fixed positions?
Explain what happens to the particles in a solid when it is heated until it melts. Include what happens to the temperature during melting.