Science at key stage 3 (Year 7)
Unit 7F: Simple chemical reactions
Section 5: What new substances are made when materials burn in air or oxygen?
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Objectives |
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- that burning requires oxygen
- that new substances, usually oxides, are formed when materials burn
- to use appropriate scientific terminology and conventions
- how to carry out combustion reactions safely
- to identify and note key points
- to group sentences into coherent paragraphs with subheadings as appropriate
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Activities |
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Outcomes |
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Children: |
- Demonstrate burning some elements in air and then in oxygen. Emphasise the hazards of burning materials in oxygen. Use secondary sources to illustrate more hazardous reactions. Show pupils how to burn materials safely in oxygen. Ask pupils to describe what they see and point out to them that in each case the new material is an oxide and that a chemical reaction has taken place.
- Introduce the idea of word equations for simple combustion reactions and ask pupils to sort cards showing reactants and products to produce word equations.
- Ask pupils to use secondary sources to find information about fire prevention and firefighting and to produce information sheets,
eg for use in the home, explaining key principles.
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- describe,
eg through producing word equations, burning as a reaction in which a material reacts with oxygen to produce an oxide
- name the products of some reactions
- explain precautions that need to be taken when burning materials and why more care is needed if materials are burnt in oxygen
- identify key points about fire safety
- express key points clearly in a structured way
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Points to note |
- In key stage 2, pupils will have considered burning as an irreversible change (
unit 6D 'Reversible and irreversible changes'). However, they are unlikely to have considered it in terms of combination with oxygen.
- Some teachers may wish to test the pH of the oxide produced and to demonstrate that the product of burning carbon turns lime water cloudy.
- At this stage word equations are used as shorthand. Teachers may wish to postpone their introduction for some pupils. Units 8E, 8F, 9E, 9F, 9G and 9H deal more fully with equations.
- This activity could be ICT-based.
Safety
- eye protection should be worn by teachers and pupils, who should be seated 2m away. Employer's risk assessments on the use of elements such as sulphur, phosphorus and magnesium should be consulted
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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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