AQA GCSE Chemistry · 8462
Specification 4.3.2.1 · Paper 1
The representative group of ions shown by the formula of an ionic substance, such as NaCl.
Revise: The Mole ConceptIt might mean atoms, molecules, ions, electrons or formula units.
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GCSE Chemistry · key term
The simplest whole-number ratio of ions in an ionic compound, represented by its chemical formula.
Used by AQA, Edexcel and OCR
Specification 4.3.2.1 · Paper 1
The representative group of ions shown by the formula of an ionic substance, such as NaCl.
Revise: The Mole ConceptIt might mean atoms, molecules, ions, electrons or formula units.
Specification 0.1, 1.26, 1.50, 1.51 · Paper 1, Paper 2
The smallest whole-number ratio of ions represented by the formula of an ionic compound.
State the correct particles when describing a mole: for example, atoms, molecules, ions or formula units. Ionic substances such as sodium chloride do not consist of molecules.
State what is being counted: atoms, molecules, ions or formula units. One mole of oxygen atoms is not the same as one mole of oxygen molecules.
For an ionic compound such as NaCl, refer to formula units rather than molecules.
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The smallest whole-number ratio of ions in an ionic compound.
The simplest whole-number ratio of ions shown by the formula of an ionic compound, such as NaCl.
The smallest whole-number ratio of ions represented by the formula of an ionic compound; ionic compounds do not consist of separate molecules.
Specification C2.1d, C3.1d, CM5.1i · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The simplest whole-number ratio of ions in an ionic compound.
Revise: Deducing Empirical FormulaeA diagram may show several repeated formula units. Do not copy the total counts straight into the final formula unless they are already in their simplest ratio.
The simplest whole-number ratio of positive ions to negative ions in an ionic compound.
The whole particle represented by a chemical formula, especially for an ionic substance that does not consist of separate molecules.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A chemical formula showing the simplest whole-number ratio of ions in an ionic compound.
The small whole-number ratio of ions represented by the formula of an ionic compound.