(a)[3]
Describe and explain the pattern shown by the volatilities of the halogens $\text{Cl}_2$, $\text{Br}_2$ and $\text{I}_2$.
(b(i))
For each pair of compounds below, predict which compound has the higher boiling point, then explain the reason for your answer: $\text{H}_2\text{O}$ and $\text{H}_2\text{S}$.
(b(ii))[4]
For each pair of compounds below, predict which compound has the higher boiling point, then explain why: $\text{CH}_3\text{CH}_2\text{CH}_3$ and $\text{CH}_3\text{OCH}_3$.
(c)[2]
Briefly explain the shape of the $\text{SF}_6$ molecule, and draw a diagram to support your answer.