Use a knowledge of dissolving to of the mixture?/What would happen if of rock filtering and ‘samples’ decide how mixtures should be we left the solution for a few days? salt from evaporation. separated. Answers should include a description different mines, Exceeding and an explanation. and ask students Students Justify the decision to separate a to determine practise solution in a certain way. Exploring: Making salt from rock salt which would be evaporation of Working Scientifically Students obtain samples of pure salt the best to copper sulfate ‘mine’ Identify to themselves and others from rock salt, using the techniques use for making solution to of filtering and evaporation. salt. dryness. and state the meaning of: risk, hazard. Explain why a certain safety instruction Explaining: Heating to dryness Explaining: has been given, and describe how to demonstration Heating to control familiar risks. Demonstrate or let students practise dryness Recognise a range of risks and plan evaporation of copper sulfate solution demonstration appropriate safety precautions. to dryness. Discuss the Justify chosen methods of risk hazards reduction. Plenary: Thinking skills associated with Carry out an experiment safely by Odd One Out: Drying nail varnish, heating for too following all safety recommendations. boiling water, disappearing rain long. puddle. (Possible answers: boiling water because other two are examples of evaporation, drying nail varnish because it involves a solvent other than water.) Lesson 7Ed: Chromatography Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Chromatography introduction Explaining: Resources n/a Students Give examples of chromatography Demonstrate chromatography to the Chromatography from 7Ed produce is used, and describe how whole class using a dark-coloured other Exploring chromatograms chromatography is used to separate water-based ink that includes a range solvents Science. of water-soluble mixtures. of different colours. Challenge substances Securing students to (e.g. felt tip Explain how chromatography works, Exploring: Chromatography analysis suggest pens, food and interpret a chromatogram. Students out a simple situations where colours, colours Exceeding chromatography analysis of this analysis from the hard
Use a knowledge of dissolving to decide how mixtures should be separated. Exceeding Justify the decision to separate a solution in a certain way. Working Scientifically Identify to themselves and others and state the meaning of: risk, hazard. Explain why a certain safety instruction has been given, and describe how to control familiar risks. Recognise a range of risks and plan appropriate safety precautions. Justify chosen methods of risk reduction. Carry out an experiment safely by following all safety recommendations. of the mixture?/What would happen if we left the solution for a few days? Answers should include a description and an explanation. Exploring: Making salt from rock salt Students obtain samples of pure salt from rock salt, using the techniques of filtering and evaporation. Explaining: Heating to dryness demonstration Demonstrate or let students practise evaporation of copper sulfate solution to dryness. Plenary: Thinking skills Odd One Out: Drying nail varnish, boiling water, disappearing rain puddle. (Possible answers: boiling water because other two are examples of evaporation, drying nail varnish because it involves a solvent other than water.) ‘samples’ of rock salt from different mines, and ask students to determine which would be the best ‘mine’ to use for making salt. Explaining: Heating to dryness demonstration Discuss the hazards associated with heating for too long. filtering and evaporation. Students practise evaporation of copper sulfate solution to dryness. Lesson 7Ed: Chromatography Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Give examples of chromatography is used, and describe how chromatography is used to separate mixtures. Securing Explain how chromatography works, and interpret a chromatogram. Exceeding Starter: Chromatography introduction Demonstrate chromatography to the whole class using a dark-coloured water-based ink that includes a range of different colours. Exploring: Chromatography analysis Students out a simple chromatography analysis of Explaining: Chromatography other solvents Challenge students to suggest situations where this analysis Resources from 7Ed Exploring Science. n/a Students produce chromatograms of water-soluble substances (e.g. felt tip pens, food colours, colours from the hard