(a)[2]
At room temperature and pressure, chlorine is a green gas. State the appearance of iodine at room temperature and pressure.
(b(i))[1]
Explain, in terms of electrons, why chlorine acts as an oxidising agent in this reaction. $\text{Cl}_2(aq) + 2\text{I}^-(aq) \rightarrow 2\text{Cl}^-(aq) + \text{I}_2(aq)$
(b(ii))[1]
State the oxidation number for iodine in $\text{I}_2$.
(b(iii))[1]
Describe the observable change during the displacement reaction.
(c(i))[1]
State the meaning of the term diffusion.
(c(ii))[1]
Explain why fluorine diffuses at a higher rate than chlorine when conditions are the same.
(c(iii))[1]
As the temperature increases, the rate of diffusion of fluorine increases. Suggest why, using ideas about kinetic particle theory.