GCSE Combined Science (AQA)

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Liquids

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Particle model of matter Changes of state and the particle model

Liquids

2:01 Density and States of Matter
Spec 4.3.1.1
Previous Solids Next Gases
  • Liquid is a state of matter where atoms or molecules are in contact in an irregular structure.
  • Molecules in a liquid are in contact but not arranged or structured.
  • Molecules in a liquid can move and flow around each other while staying in contact.
  • Bonds in a liquid are not strong enough to hold molecules in position but strong enough to keep them in contact.
  • A liquid takes the shape of its container, such as water in a glass.
  • When poured, liquid molecules flow, stay together, and can break off.
  • Gravity pushes liquid molecules against the container, changing the liquid's shape to match it.
  • Similar to sand or salt particles, where each crystal acts like a liquid molecule but is solid individually.
  • In exams, the state of substances will be clearly stated.
  • Liquids can easily change shape but are hard to compress.
  • Liquid molecules are already in contact, making compression difficult as there's no space to move into.
  • In exams, relate the properties of liquids to their molecular structure.

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