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Science at key stage 3    (Year 7)

Unit 7F: Simple chemical reactions
Section 4: How do acids react with carbonates?

QCA

Objectives
Children should learn:
  • how to carry out a test for carbon dioxide
  • to produce new substances, including carbon dioxide
  • to identify and describe patterns in qualitative data
  • to generalise from their observations

Activities

Outcomes
Children:
  • Ask pupils what the 'fizz' in bottled water is. Identify the gas as carbon dioxide and demonstrate how to collect carbon dioxide and test for it using lime water.
  • Provide pupils with samples of carbonate, possibly including rocks, eg chalk, building materials, eg marble, household materials, eg baking powder, carbonate indigestion remedies, and ask them to investigate the effect of adding a range of acids to these and to record and make generalisations from their results. Establish that in each case a chemical reaction took place and draw out the idea that chemical reactions are important.
  • carry out and describe the lime water test for carbon dioxide
  • generalise that when an acid is added to a carbonate, carbon dioxide is made
  • use a table to present observations in a way which enables patterns to be seen
  • conclude that the production of carbon dioxide is evidence of a chemical reaction

Points to note
  • It may be helpful to emphasise that the colourless gas (carbon dioxide) collected in this activity is a different material and behaves differently from the gas collected in the previous activity.
  • The effects of acid rain on carbonate building materials are covered in unit 8G 'Rocks and weathering'.

    • Safety

    • eye protection should be worn when lime water is in use
    • eye protection should be used. 0.4 mol dm-3 acid is suitable

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. What is a chemical reaction?
2. a. How do acids react with metals?
3. b. How do acids react with metals?
4. How do acids react with carbonates?
5. What new substances are made when materials burn in air or oxygen?
6. Checking progress
7. What is produced when fuels burn?
8. What is needed for things to burn?
9. Reviewing work