This is the first of two lessons in the bundle and introduces ideas of diffusing particles and the laws of diffusion. The lesson starts with the Jaws movie trailer to prompt thinking about how the shark was a able to smell it’s prey. There are demo and practical activity opportunities to demonstrate diffusion in gases and liquids whilst simultaneously introducing ideas about factors affecting diffusion rate. One of the videos looks at the effect of surface area on diffusion rate using agar jelly, but does not show the results. This could be an opportunity for students to try for themselves. The lesson concludes with an exam question.
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