- Demonstrate that a metal,
eg zinc, reacts with both hydrochloric acid and sulphuric acid to produce a gas. Establish that the bubbles indicate that a gas is being formed, that this is a new material and that a chemical reaction is taking place. Show pupils the formulae for the two acids and ask them to suggest what the gas might be. Remind them of the test for hydrogen and demonstrate that hydrogen is formed.
- Ask pupils to find out whether similar reactions occur when other metals,
eg magnesium, iron, react with hydrochloric acid and to record their results in a table. Establish that hydrogen is produced in each case and, using the names, symbols and formulae for the reactants and hydrogen, ask pupils to suggest what has happened to the metal and where the other product might be found. Using appropriate sample(s), show by evaporation that the salt remains in solution. Using the patterns in the equations, ask pupils to predict what will be made when calcium reacts with hydrochloric and sulphuric acids. Demonstrate the reactions, showing that hydrogen is made.
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- identify the gas produced in the reaction between metals and acids as hydrogen
- write word equations for the reactions and explain the similarities between them
- use the formulae of the reactants and products to explain how atoms join in different ways as a result of the reaction
- predict that hydrogen and the appropriate salt will be made as a result of the reaction
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