This resource is a PowerPoint lesson on writing and naming chemical formulas for ionic compounds. It explains how to use valency to work out formulas, introduces some common polyatomic ions, and shows students how to use the criss-cross method step by step. It also includes worked examples such as sodium chloride, zinc chloride, aluminium oxide, calcium nitrate, sodium carbonate, aluminium sulphate, and ammonium chloride, with practice tasks for students.
It can be used to introduce the topic, reteach it, or give students extra practice with basic ionic formulas and naming compounds.
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