Explain how chromatography works, Students carry out a simple situations where colours, colours and interpret a chromatogram. chromatography analysis of this analysis from the hard Exceeding substances (e.g. felt tip pens, could be useful sugar coating of Evaluate the information provided by food colours, colours from the hard (e.g. in a forensic sweets). chromatograms. sugar coating of sweets). examination). Explaining: Chromatography using other solvents Demonstrate that a chromatogram can be made from non-water-soluble substances by using a solvent in which the substances do dissolve. For example, separating the colours in biro ink or a 'permanent' marker pen using ethanol or methylated spirits. Plenary: Thinking skills Odd One Out: Evaporation, chromatography, filtration. (Possible answers: chromatography because it separates dissolved substances, filtration because it starts with a mixture containing an undissolved (insoluble) Lesson 7Ee: Distillation Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: The cycle Explaining: Liebig Resources n/a Students distil Give examples of where distillation is Give students one minute to draw a condenser from 7Ee 'dirty' water used, and describe how distillation can diagram to show the water cycle. This could lead Exploring using side-arm separate mixtures. Then ask students to share their onto a debate Science. test tubes. Securing ideas about the water cycle in groups about the Explain how distillation works. and explain why rain is not salty. problems of Demonstrate Identify factors that could affect providing safe the distillation distillation. Exploring: Distilling dirty water drinking water, of dirty (or Exceeding including issues inky) water,
Explain how chromatography works, and interpret a chromatogram. Exceeding Evaluate the information provided by chromatograms. Students carry out a simple chromatography analysis of substances (e.g. felt tip pens, food colours, colours from the hard sugar coating of sweets). Explaining: Chromatography using other solvents Demonstrate that a chromatogram can be made from non-water-soluble substances by using a solvent in which the substances do dissolve. For example, separating the colours in biro ink or a 'permanent' marker pen using ethanol or methylated spirits. Plenary: Thinking skills Odd One Out: Evaporation, chromatography, filtration. (Possible answers: chromatography because it separates dissolved substances, filtration because it starts with a mixture containing an undissolved (insoluble) situations where this analysis could be useful (e.g. in a forensic examination). colours, colours from the hard sugar coating of sweets). Lesson 7Ee: Distillation Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Give examples of where distillation is used, and describe how distillation can separate mixtures. Securing Explain how distillation works. Identify factors that could affect distillation. Exceeding Starter: The cycle Give students one minute to draw a diagram to show the water cycle. Then ask students to share their ideas about the water cycle in groups and explain why rain is not salty. Exploring: Distilling dirty water Explaining: Liebig condenser This could lead onto a debate about the problems of providing safe drinking water, including issues Resources from 7Ee Exploring Science. n/a Students distil 'dirty' water using side-arm test tubes. Demonstrate the distillation of dirty (or inky) water,
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