Memory Anchor:

• Students describe what is happening to be particles: ie transition from a lattice to lacking a pattern (amorphous structure)

Super Challenge:

Stretch:

Challenge:

Key Questions:

1. What happens when a solid is heated but does not yet melt?
   • Matter expands when heated so becomes less dense.
2. What happens to particles when they are heated?
   • Particles move faster when heated, and so occupy a larger space.
3. What happens to the force of collision of particles when heated?
   • When heated, the Forces involved in collisions increases as the Particles are moving faster.
4. At what temperature would particles ever be stationary?
   • Particles are never stationary - other than at absolute zero There is nothing in the gaps between Particles.
5. What common chemical is an anomaly and actually less dense as a solid?
   • The anomaly of ice-water transition: This is why ice floats on water and a full bottle of water breaks in a freezer. It expands and becomes less dense when freezing to a solid.