Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is concentration?
   • Concentration is the number of a particular type of Particle in a volume of space.
2. What is diffusion?
   • diffusion in liquids and gases driven by differences in concentration
3. What happens to the particles in a fluid?
   • diffusion in terms of the Particle model
4. Why do particles move from an area where there are more to where ther
   • Half of a large number is more than half of a smaller number. So more Particles will travel from a larger number of Particles (high concentration), than are replaced by the smaller number moving form the smaller number of Particles (lower concentration).