CAIE IGCSE Chemistry 2.4.7 Ionic Compound Properties From Questions

Use giant-lattice structure and electrostatic attraction to explain ionic compound properties.

Exam points

explain high melting points using strong electrostatic attraction in giant ionic lattices
explain electrical conductivity of ionic compounds when molten or dissolved
compare ionic, metallic and covalent structures and properties
identify the attractive forces broken during melting

[Maximum number: 3]

This question is about the elements sodium and fluorine and the compound sodium fluoride.

Some properties of sodium, fluorine and sodium fluoride are shown in Table 3.1.

Table 3.1

Explain in terms of structure and bonding why sodium fluoride has a much higher melting point than fluorine.

M1 ionic bonds in NaF(1)

M2 attraction between molecules or intermolecular forces in $\mathrm{F}_{2}(1)$

M3 weaker attraction (between particles) in $\mathrm{F}_{2} \mathrm{ORA}$ (1)

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CAIE IGCSE Chemistry 2.4.7 Ionic Compound Properties From Questions question 1