I'm a PGCE student and I'm three lessons in to the Y7 particles topic. Today my observation was that my lesson needed a bit more 'oomph' (standing on the tables was suggested, but that's not really me!). Any ideas? The scheme of work has the following learning outcomes: Describe the motion of gas particles. Explain how a substance diffuses using the particle theory Use the particle model to explain how the speed of diffusion can be affected I'm thinking of a title (which the teacher likes to be a question) of: How can you smell my perfume on the other side of the room? and a WALT of: What happens to the particles in a gas after they escape from a container. My suggested teaching and learning ideas are: Demonstration of experiments to illustrate diffusion : coloured crystals in water; aerosol deodorant or air freshener; Demonstration of experiments which illustrate gas pressure: collapsing can; air pressure circus Use observations and secondary sources to present explanations for diffusion and gas pressure. This is a mixed ability year 7 class with y9 targets ranging from L4-L7. Any ideas gratefully recieved, I would love to get a really good review from this teacher!