(a(i))[1]
Compounds with formulae such as $\text{CCl}_3\text{F}$ and $\text{C}_2\text{Cl}_2\text{F}_5$ cause ozone depletion. State the general name for these compounds.
(a(ii))[2]
Explain, in terms of human health, why it matters that the ozone in the stratosphere should not become too depleted.
(b(i))[1]
In the stratosphere, ozone, $\text{O}_3$, is broken down into oxygen by photochemical reactions. What is meant by the term photochemical reaction?
(b(ii))[1]
Construct an equation for the decomposition of ozone molecules into oxygen molecules.
(c)[1]
Ozone oxidises $\text{Fe}^{2+}$ ions to $\text{Fe}^{3+}$ ions. Complete the ionic equation for this reaction.\n\n$\ldots\,\text{Fe}^{2+} + \ldots\,\text{H}^+ + \text{O}_3 \rightarrow \ldots\,\text{Fe}^{3+} + \text{H}_2\text{O} + \text{O}_2$