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Particle model and mass conservation

Particle model and mass conservation

Particle model of solid, liquid and gas with arrows showing melting, freezing, evaporation, condensation, sublimation and deposition

A change of state happens when a substance moves between solid, liquid and gas without becoming a new substance. In the particle model, solids have particles close together in a regular arrangement, liquids have close but random particles, and gases have particles far apart and moving freely.

1.2 Changes of state Lesson

  1. GCSE
  2. /Physics
  3. /1.2 Changes of state

Step-by-step lessons on OCR GCSE Physics 1.2 Changes of state, covering 1.2.1 Conservation of mass during changes of state, 1.2.2 Physical and chemical changes, 1.2.3 Heating, temperature and changes of state, 1.2.4 Specific heat capacity and specific latent heat, 1.2.5 Internal energy and temperature change, and 1.2.6 Energy transfer during a change of state. Each one builds up to exam-style questions. Paper 2 and Paper 4 include synoptic questions that draw on Topics P1–P4, so revisit earlier topics before final exams rather than treating each paper as self-contained.

Lessons