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GCSE Chemistry 02 — Structure, Bonding and Properties of Matter

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Topics include States of Matter & The Particle Model, Diffusion & Solubility, Formation of Ions & Electronic Configuration, Ionic Bonding & Formulae, Giant Ionic Structures & Properties, Covalent Bonding, Simple Molecular Substances, and Giant Covalent Structures: Diamond, Graphite & Silica.

Chemistry EN
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States of Matter & The Particle Model

The particle model explains solids, liquids and gases using particle arrangement, movement and the strength of attractions between particles. It also helps explain changes of state and diffusion, but it is a simplified model with limitations.

Key points

  • Solids: Particles are packed closely in a regular arrangement and vibrate about fixed positions → fixed shape and volume.
  • Liquids: Particles are mostly touching but randomly arranged. They move past each other → liquids flow and take the container’s shape (fixed volume).
  • Gases: Particles are far apart and move rapidly in random directions → gases fill the container and are easily compressed.
  • Diffusion: Random particle motion causes spreading from high to low concentration; diffusion is fastest in gases, slower in liquids, very slow in solids.
  • Changes of state: Melting/freezing and boiling/condensing happen when energy is transferred; the particles stay the same substance but their arrangement and movement changes.

Worked example

Question

A student heats ice at 0 °C until it has completely melted, but the thermometer stays at 0 °C for a while. Explain why.

Solution

While the ice is melting, the energy transferred is used to overcome the attractions between particles so they can move around each other as a liquid. Because that energy is not increasing the particles’ kinetic energy, the temperature stays constant until all the solid has melted.

Common pitfalls

  • Writing that bonds are broken during melting/boiling. At GCSE level, it’s the attractions between particles that are overcome, not covalent/ionic bonds.
  • Saying temperature increases during melting/boiling. It stays constant while the state is changing because energy is going into overcoming attractions (latent heat).
  • Thinking particles in a liquid are far apart like a gas. In liquids they are still close together; they just move past each other.

Prerequisites

  • Basic understanding of solids, liquids, and gases
  • Kinetic energy concepts
Further resources