Science
Matter & Materials
Conceptual
11–12 yrs
The Particle Model
粒子模型
Description
Use the particle model to explain the properties of solids, liquids, and gases — including differences in arrangement, movement, and spacing — and apply the model to explain density, compressibility, and the anomalous expansion of water
Mastery Evidence
- Draws particle diagrams for solids, liquids, and gases showing correct arrangement and spacing
- Explains why gases are compressible but liquids and solids are not
- Explains why ice floats on water using the anomalous expansion of water
- Uses particle spacing to explain why gases are much less dense than solids and liquids
Assessment Prompt
If your child was asked why you can squash a balloon but not a water bottle full of liquid, could they explain using the idea of particles what's different about gases and liquids?
