|See worksheets 2.2a-2.2e|
|Suggestions for use:|
The activities can be carried out in a learning cycles in small groups. The teacher can decide whether there should be a particular sequence to the activities or a free combination. Station 1 focuses on diffusion which can be explain by the Brownian motion. Station 2 focuses on the permeability of polymer membranes. Stations 3 and 4 extend the concept of particles and holes to different sizes of particles and explain it through molecular models. Station 5 develops visual models for the invisible structures and processes.