(a)[2]
A sample of chlorine has a volume of $240\,\text{cm}^3$ at room temperature and pressure. The pressure of the sample is then increased while the temperature is kept at room temperature. Describe and explain, in terms of kinetic particle theory, what happens to the volume of the sample.
(b)[3]
When heated at atmospheric pressure, iodine passes straight into a gas without first becoming a liquid. Describe how particle separation, arrangement and motion change during this process.
(c)[1]
At the same temperature and pressure, chlorine gas diffuses at a higher rate than iodine gas. Explain why.
(d)[3]
The symbol for an iodide ion is $^{126}_{53}\text{I}^-$. Complete Table 7.1 for this iodide ion.