CAIE IGCSE Chemistry 2.4.7 Ionic Compound Properties From Questions
Use giant-lattice structure and electrostatic attraction to explain ionic compound properties.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- Explain high ionic melting points using strong electrostatic attraction between oppositely charged ions and the large energy needed to overcome it.
- Explain poor solid conductivity by ions fixed in the lattice, and molten or aqueous conductivity by ions free to move and carry charge.
- Compare ionic and simple molecular melting points by identifying the particles and forces involved: strong ion attractions versus weaker forces between molecules.
- If the specified ionic compound does not dissolve in water, select melting to enable conduction and justify the choice using mobile ions.
CAIE IGCSE Chemistry 2.4.7 Ionic Compound Properties From Questions question 1
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.
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