metres to millimetres, micrometres and nanometres. Explaining: Investigating Brownian motions Set up a demonstration of Brownian motion using a smoke cell. Plenary: Thinking about theories Odd One Out: the Sun and Moon circle the Earth, Rajesh will go shopping tomorrow, all things can exist in one of three states, shadows are formed when light cannot pass through something. (Possible answers: Sun and Moon circle the ‘the Earth’ has been disproved; ‘Rajesh …’ is a prediction whereas the others are theories.) Lesson 7Gd: Diffusion Learning objectives Exemplar teaching activities Differentiation Resources skills Practical skills Developing Starter: Diffusion n/a Resources n/a Demonstrate Describe diffusion as the movement Place a container of a strong-smelling from 7Gd the ‘traditional’ of one substance through another substance (ethanol, perfume or Exploring experiment without any external mixing. in the room just before the Science. investigating Recall some everyday examples of students enter. Some students may the diffusion of diffusion. comment on the smell, and others may hydrogen Make a prediction about diffusion. notice that the smell has not reached chloride and Securing all areas of the room. Discuss the ammonia Explain how diffusion occurs in terms reasons for this and introduce the term The of movement of particles. demonstration ‘diffusion’. Explain why the of diffusion in should be gases is faster than in liquids. Exploring: Diffusion of hydrogen carried out in a Recognise examples of diffusion chloride and ammonia fume cupboard. causing problems.
metres to millimetres, micrometres and nanometres. Explaining: Investigating Brownian motions Set up a demonstration of Brownian motion using a smoke cell. Plenary: Thinking about theories Odd One Out: the Sun and Moon circle the Earth, Rajesh will go shopping tomorrow, all things can exist in one of three states, shadows are formed when light cannot pass through something. (Possible answers: ‘the Sun and Moon circle the Earth’ has been disproved; ‘Rajesh …’ is a prediction whereas the others are theories.) Lesson 7Gd: Diffusion Learning objectives Exemplar teaching activities Differentiation Resources skills Practical skills Developing Describe diffusion as the movement of one substance through another without any external mixing. Recall some everyday examples of diffusion. Make a prediction about diffusion. Securing Explain how diffusion occurs in terms of movement of particles. Explain why the of diffusion in gases is faster than in liquids. Recognise examples of diffusion causing problems. Starter: Diffusion Place a container of a strong-smelling substance (ethanol, perfume or in the room just before the students enter. Some students may comment on the smell, and others may notice that the smell has not reached all areas of the room. Discuss the reasons for this and introduce the term ‘diffusion’. Exploring: Diffusion of hydrogen chloride and ammonia n/a Resources from 7Gd Exploring Science. n/a Demonstrate the ‘traditional’ experiment investigating the diffusion of hydrogen chloride and ammonia The demonstration should be carried out in a fume cupboard.
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