AQA GCSE Chemistry · 8462
Specification 4.3.1.3 · Paper 1
- Revise: Mass Changes in Gas Reactions
A model that explains matter as particles and chemical reactions as rearrangements of atoms.
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GCSE Chemistry · key term
A representation that explains the properties and behaviour of matter by treating it as tiny particles with spaces between them.
Used by AQA, Edexcel and OCR
Specification 4.3.1.3 · Paper 1
A model that explains matter as particles and chemical reactions as rearrangements of atoms.
Specification 2.1 · Paper 1
A model that explains the properties of matter using the arrangement, movement and energy of its particles.
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The particle model helps us describe each state by considering how its particles are arranged, how they move and how much energy they have. The particles are the substance itself; they are not little objects suspended inside it. A particle diagram shows the gaps and arrangement schematically, rather than the particles’ actual size.
Specification C1.1a, C1.1b, C1.1c, C3.1j · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Features of the Particle ModelMatter may look continuous, but the particle model represents it as enormous numbers of tiny particles. The particles are the substance; they are not objects embedded in some other material. There is space between them, and they are always moving—even in a solid.
A representation that describes matter as tiny particles and helps to explain observable properties and changes.
A simplified representation used to describe and explain the behaviour of matter in terms of small particles.
A way of explaining matter as particles, such as atoms and molecules, which can move and be rearranged.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A simplified representation used to explain observations and make predictions about matter in terms of tiny particles.
Revise: The particle modelThe particle model helps us connect properties that we can observe with behaviour on a scale too small to see directly. In this model, a substance consists of many tiny particles. Depending on the substance, one model particle might represent an atom, a molecule or an ion.
A simplified description in which matter is represented as particles and their arrangement and movement are used to explain properties and changes of state.
A model that explains substances in terms of particles such as atoms and molecules and how those particles behave.