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CAIE IGCSE Chemistry Simple Molecular Properties Explained

CAIE IGCSE Chemistry Simple Molecular Properties Explained
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise explaining low melting or boiling points and poor conductivity by referring accurately to intermolecular forces and available charge carriers.

How this is tested

  • explain low melting or boiling points by weak intermolecular forces requiring little energy
  • avoid saying covalent bonds break during melting because the forces overcome are between molecules
  • explain non-conduction through the absence of mobile ions or delocalised electrons

Question 3(c)(ii)

[Maximum number: 1]

This question is about ionic and covalent compounds.

The melting points of sodium oxide and carbon dioxide are shown in Table 3.1.

Table 3.1

Table 3.1

Carbon dioxide has a low melting point.

State the general term for the weak forces that cause carbon dioxide to have a low melting point.
[Total: 9]