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Science at key stage 3    (Year 9)

Unit 9E: Reactions of metals and metal compounds
Section 4: What evidence is there of a chemical reaction between acids and metal oxides?

QCA

Objectives
Children should learn:
  • that acids react with metal oxides, producing a salt and water
  • that production of the salt is evidence of a chemical reaction
  • to represent reactions of acids with metal oxides by word equations

Activities

Outcomes
Children:
  • Demonstrate, or ask pupils to carry out, a reaction between a metal oxide and an acid (preferably one that produces a coloured salt, eg copper sulphate) and ask pupils for evidence that a chemical reaction has taken place. Separate any excess metal oxide, reminding pupils how to use filtration apparatus, and evaporate the water. Compare the salt formed with a stock sample.
  • Help pupils to construct a word equation and, by using the formula, to identify the other product. Ask pupils to explain why this reaction did not produce bubbles. Give pupils the names of some other salts and ask them to suggest which acid and metal oxide would be needed to make them. Display suggestions and ask others to explain whether they are correct or not.
  • identify evidence for a chemical reaction, eg crystals are made, which are a different colour from what we started with
  • represent reactions by word equations
  • identify the patterns in word equations and produce a general equation

Points to note
  • Extension: some pupils might investigate what happens to the pH of the acid when the metal oxide is added. This could provide an opportunity for datalogging using ICT.
  • Extension: this offers further opportunities for some pupils to practise writing formulae and symbol equations.

    • Safety

    • 0.4 mol dm-3 acid is suitable. Eye protection should be worn. Ensure pupils use excess oxide so that acid is not evaporated. Sometimes the reaction is very slow towards the end and not all of the acid is used up
    • do not use nickel oxide, which is toxic and a grade 1 carcinogen

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. Why are metals useful?
2. What happens when metals react with acids?
3. How do acids react with metal carbonates?
4. What evidence is there of a chemical reaction between acids and metal oxides?
5. Checking progress
6. a. What is a salt?
7. b. What is a salt?
8. c. What is a salt?
9. Reviewing work