Science at key stage 3 (Year 7)
Unit 7E: Acids and alkalis
Section 8: Where is neutralisation important?
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Objectives |
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- how to frame a question that can be investigated
- how to use preliminary work to help decide what to measure or to observe
- to choose appropriate techniques and equipment
- to compare their investigative method and evidence collected with those of others
- to work with others in summarising information and evaluating a product
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Activities |
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Outcomes |
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Children: |
- Remind pupils of earlier work about acid in the stomach. Show pupils a range of packages and leaflets for some common antacid indigestion remedies and ask them to identify how the remedies are intended to work and to suggest what sort of solution would work and be safe to take.
- Ask them to suggest ways in which one remedy might be more effective than others and how they might investigate their suggestions.
- Encourage a range of different investigations,
eg Does one tablet of each antacid neutralise the same amount of acid? Do the antacids neutralise acid equally quickly? Ask pupils to write a brief account of their suggestions, results and what they found out, to share with other groups in the class. Encourage pupils to question each other about what they did and what they found out.
- Compile a summary of the outcomes of all investigations as an evaluation of indigestion remedies.
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- decide on a suitable question to investigate and suitable techniques for doing so
- summarise what they have found out
- demonstrate understanding of the strength of evidence through the questions they ask
- use the evidence collected to evaluate an indigestion remedy
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Points to note |
- This activity offers pupils the opportunity to see how work carried out by different groups can be evaluated and synthesised.
- It is possible to simulate different antacids by mixing bicarbonate of soda and salt in varying proportions.
- It may be helpful to review words used on commercial products,
eg antacid, and compare them with scientific terms,
eg alkali, as pupils may be confused by the change in terminology.
- As an alternative, pupils could be asked to investigate differences in the acid content of a range of soft drinks.
Safety
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teachers should check pupils' plans for health and safety before practical work begins
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This unit is divided into sections. Each section contains a sequence of
activities with related objectives and outcomes. You can view this unit by
moving through the sections or print/download the whole unit.
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