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Science at key stage 3    (Year 9)

Unit 9H: Using chemistry
Section 8: b. What happens to atoms and molecules when new materials are made?

QCA

Objectives
Children should learn:
  • that when gases are formed in reactions, mass may appear to decrease because the gas escapes
  • that mass is also conserved in dissolving and changes of state

Activities

Outcomes
Children:
  • Challenge pupils to decide whether mass would be conserved during a reaction in which a gas was made and, if possible, demonstrate this, eg by collecting gas in a syringe. Provide pupils with a number of descriptions of burning, eg it all turns into ash, nothing is left, the wood just shrivels away, and ask them to reconcile these with the idea of conservation of mass.
  • recognise that mass is conserved in reactions in which gases are produced
  • explain the apparent loss in mass in reactions involving the production of gases

Points to note
  • Extension: pupils could be asked to apply their ideas of conservation of mass to the reactions of respiration and photosynthesis.

    • Safety

    • teachers need to ensure that pupils can use gas syringes safely if they participate in the demonstration

Sections in this unit

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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.
1. a. What chemical reactions take place when fuels burn?
2. b. What chemical reactions take place when fuels burn?
3. b. How else are chemical reactions used as energy resources?
4. How else are chemical reactions used as energy resources?
5. What types of new material are made through chemical reactions?
6. Checking progress
7. a. What happens to atoms and molecules when new materials are made?
8. b. What happens to atoms and molecules when new materials are made?
9. c. What happens to atoms and molecules when new materials are made?
10. d. What happens to atoms and molecules when new materials are made?
11. Reviewing work