Which of the following terms is not used for ionic compound ?
Correct answer: C. molecular formula
- A. formula unit
- B. empirical formula
- C. molecular formula
- D. formula mass
Explanation
Ionic compounds form extended crystal lattices rather than separate molecules, so they are described by formula units and formula masses. Their written formulas also give the simplest ratio of ions, so they may be called empirical formulas. Students may choose b because they associate empirical formulas only with covalent substances, but ionic formulas are inherently simplest ratios.
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About Ionic and Molecular Crystals
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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