Bonding

Table 1 shows the melting points of three substances.

\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}

Explain why the melting points of these substances are different.

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

[6]

Table 1 shows the melting points of three substances.

\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}

Explain why the melting points of these substances are different.

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

[6]

Bonding Questions