AQA GCSE Combined Science Trilogy · 8464
Specification 5.3.2.1 · Paper 3
Revise: MolesSodium chloride is ionic rather than molecular: each formula unit represents one sodium ion and one chloride ion.
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GCSE Combined Science · key term
The simplest whole-number ratio of ions represented by the formula of an ionic compound. For example, NaCl represents one sodium ion for every chloride ion.
Used by AQA and Edexcel
Specification 5.3.2.1 · Paper 3
Revise: MolesSodium chloride is ionic rather than molecular: each formula unit represents one sodium ion and one chloride ion.
Specification Calculations involving masses · Paper 3, Paper 4
The simplest whole-number ratio of ions represented by the formula of an ionic compound. For example, one NaCl formula unit represents one sodium ion for every chloride ion; it is not a separate molecule.
State which particles you mean: atoms, molecules, ions or formula units. One mole of CO₂ molecules is not one mole of atoms.
Identify what is being counted: atoms, molecules, formula units or ions. State the particle type in your answer.
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