Introduction
- Some solids will not form a solution in water (insoluble solids).
Teacher Input 8
- Tell learners that they have now learnt that some substances are soluble and others are not (insoluble).
- Ask the learners what their mothers or sisters use to remove nail polish from their nails.
Answer: Nail polish remover or thinners.
- Is it possible to remove your nail polish with water? Why not?
Answer: Nail polish is not soluble in water.
- Can the learners think of any other examples?
Answers can include: We can clean a paintbrush in water if we used a water-based paint. If we used an oil-based paint, the paint will not be soluble in water, so we would need to use thinners.
- Show VIDEO CLIP 8: Soluble And Insoluble Substance Why Does Salt Dissolve in Water But Not Oil Extra marks (2:24 min.).
- Present an overview of this topic by using PRESENTATION 4: Insoluble substances.
Learner Activity 6
- Learners complete WORKSHEET F: Solutions and special mixtures: Word search.
- Guide the learners on how to undertake this activity by providing examples and explaining how this worksheet will be assessed.
Teacher to use WORKSHEET F: Memorandum to mark the learners’ work
Revision Activity 1
- Learners complete Quizzes 1 and 2.
- Teacher to support learners as they undertake each quiz.
- Teacher to explain how these quizzes will be assessed.
- Teacher to use QUIZ 1 and 2: Memoranda to mark the learners’ work.
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