![]() As above, model a few examples, then give students an opportunity to practise, keeping your first examples varying only slightly, for example: sodium hydroxide, sodium sulfate, sodium carbonate, aluminium hydroxide, aluminium sulfate etc. You will also want to introduce polyatomic ions like sulfate, hydroxide and carbonate. You can also add written formulas as well like ‘sodium sulfide’ to help them realise how interconnected the topics are and that you can go from formulas to ions and from ions to formulas. Give them a lot more practice, mixing examples with different ionic ratios and stoichiometric numbers. Give students some more to practise, then pause and show them an example like 2Na 2O to marry this step with the previous step. Then show students a simple graphical way of writing the compound as ions: This enables you to test prerequisite knowledge, give your students the opportunity for retrieval practice and help your students see the connections between different topics.
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