This lesson is designed for the Activate KS3 Science Course, specifically Year 7 B1.1 Module on ‘Cells’
 
The idea of diffusion is further explained using an image of a deodrant bottle spraying smelly particles into the air and showing how they spread from an area of high concentration to an area of low concentration. A definition of this process is shown to students, before they are asked to complete a fill-in-the-blank task to summarise the process, this work can be self-assessed using the mark scheme provided.
 
Next, students will need to sketch diagrams demonstrating the various stages of diffusion, and will need to match the correct statements to the correct diagrams. This work can be then be self or peer assessed using the mark scheme provided.
 
The next part of the lesson looks at factors that affect diffusion, students are firstly asked to ‘Think > Pair > Share’ their ideas on the factors which might affect the rate of diffusion. After students have fed back into class discussion, the answers are revealed for students to note down in their books. They will then look more closely at the effect of temperature on the rate of diffusion by watching a video and then summarising what they have learned by completing a fill-in-the-blank task.
 
Lastly, students are shown diagrams of plant cells of healthy plants vs. wilted planted to demonstrate the effect of having too much/too little water in the vacuole of plant cells.