Draw a dot-and-cross diagram to show how the electrons are arranged in a chlorine molecule. Include only the outer-shell electrons.
State one use of chlorine.
Aqueous chlorine is reacted with aqueous potassium bromide. $\text{Cl}_2(aq) + 2\text{KBr}(aq) \rightarrow \text{Br}_2(aq) + 2\text{KCl}(aq)$ State the colour of $\text{Br}_2(aq)$.
Explain, using ideas about halogen reactivity, why aqueous bromine does not react with aqueous potassium chloride.
Bromine is a liquid at room temperature. Describe how the particles in a liquid are arranged and how far apart they are.
Chlorofluorocarbons (CFCs) are atmospheric pollutants which deplete the ozone layer. Explain why the ozone layer is important. Describe one problem caused by ozone layer depletion.