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Question 17

Table 1 shows the melting points of three substances.

SubstanceMelting point / KCalcium oxide (CaO)2845Iodine (I2)387Hydrogen chloride (HCl)158 \begin{array}{|l|c|} \hline \textbf{Substance} & \textbf{Melting point / K} \\ \hline \text{Calcium oxide (CaO)} & 2845 \\ \hline \text{Iodine (I}_2\text{)} & 387 \\ \hline \text{Hydrogen chloride (HCl)} & 158 \\ \hline \end{array} SubstanceCalcium oxide (CaO)Iodine (I2​)Hydrogen chloride (HCl)​Melting point / K2845387158​​

Explain why the melting points of these substances are different.

You should refer to the structure of and bonding in each substance.

[6]
Markscheme

Bonding Questions

  1. A Level
  2. /Chemistry
  3. /Bonding

54 exam-style questions on AQA A Level Chemistry Bonding, covering Ionic bonding, Nature of covalent and dative covalent bonds, Metallic bonding, Bonding and physical properties, Shapes of simple molecules and ions, Bond polarity, and Forces between molecules. Each one has a worked solution and a mark scheme showing where the marks go.

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