Spec 1.1.2 Mixtures – Could be up to three hours of teaching
Lesson(s) preparation:
Practical – Separating salt and sand
Practical – Paper chromatography
Demonstration – Variety of separation techniques
Rational: An opportunity to get some important practical work into a topic where opportunities are limited
Suggested teaching:
Lesson 1 (Slides 1-9)
Slide 4: Introduction of what a mixtures is by application of the definition
Slides 6-8: The planning and implementation of a method to separate a water soluble substance from and insoluble substance.
Slide 9: Gives an opportunity to discuss the change in properties when substances are chemically combined, linking back to previous lessons.
Lesson 2/3 (Slides 10-18)
Slides 10-11: Opportunity to summarise methods of separation and perhaps demonstrate them.
Slides 12-14: Paper chromatography practical
Slide 15: An opportunity to evidence their understanding of the difference between mixtures, elements and compounds
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