Explain why calcium bromide melts at a relatively high temperature.
Describe how calcium atoms and bromine molecules react to produce calcium ions and bromide ions, using electron transfer ideas.
Predict the products formed at each electrode during electrolysis of dilute aqueous calcium bromide.
Ozone is an oxidising agent. Describe the colour change observed when ozone gas is bubbled through aqueous potassium iodide.
Zinc is a reducing agent. Describe the colour change that occurs when excess zinc is added to acidified potassium manganate(VII).
The ionic equation for the reaction between aqueous calcium bromide and aqueous chlorine is shown: $2\text{Br}^-(\text{aq}) + \text{Cl}_2(\text{aq}) \rightarrow \text{Br}_2(\text{aq}) + 2\text{Cl}^-(\text{aq})$. Explain, in terms of electrons, why this reaction includes both oxidation and reduction.