Step 15 of 18 · Solutions and mixtures · SC4-SOL-01
The particle model
Everything is particles. Heat them and they move faster and further apart.
Learn it
Use the particle model to explain the properties of solids, liquids and gases and changes of state
Idea 1 of 4
Everything is made of particles
All matter is made of tiny particles that are always moving. The gaps between them are empty space — not air. Heating gives them more energy, so they move faster.
Know it by heart
Say each one in your head, then tap to check.
Try it
Play — nothing here is marked
Water, as particles
52 °C
The particles stay the same size the whole time. Only their speed and spacing change.
A full-marks answer
Use the particle model to explain why a metal rod gets longer when it is heated.
3 marksBuilt one line at a time — say the next line before you reveal it
- Heating gives the particles in the metal more energy.(start with energy)
Words to know
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Step 15 · last bit
Ready? Prove it.
A round of ten. Score 8 or more and this step is done — then on to solutions and dissolving.