Science at key stage 3 (Year 9)
Unit 9H: Using chemistry
Section 3: b. How else are chemical reactions used as energy resources?
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Objectives |
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- that other chemical reactions can be used as sources of energy
- about ways in which these reactions can be used
- about the effect of different aspects of formality in writing,
eg passive verbs, third person, abstract nouns
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Activities |
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Outcomes |
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Children: |
- Extend ideas about using energy from chemical reactions by asking pupils to use secondary sources to find out about 'chemical heaters' for meals or hand warmers for climbers and explorers.
- Ask pupils to think about the type of reactant and reactions that would be effective and safe and discuss this with them. Provide them with the reactants to explore energy produced by some of these reactions. Ask pupils to draw up a specification for making a 'chemical heater' or an advertisement for a heater. Before they do so, ask pupils to think about the different ways in which similar information would be used in the two tasks. Help pupils to compare a specification and an advertisement and identify and explain why the formality of the writing is different in each case.
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- describe ways in which some chemical reactions can be used
- identify and explain differences between objective and more persuasive writing
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Points to note |
- Reactions used include the reaction of iron (III) oxide and iron with water.
- It may be helpful to show pupils an endothermic reaction,
eg sodium hydrogencarbonate and citric acid, to ensure they do not think all reactions are exothermic.
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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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