Draw a labelled diagram showing the bonding in magnesium metal.
Fig. 2.1 displays some reactions of magnesium and its compounds. Identify the other products in reactions $1$ and $2$.
Reaction $3$ is used to produce a precipitate of $\text{Mg(OH)}_2$ from $\text{MgCl}_2\,(aq)$. State why $\text{Ca(OH)}_2\,(aq)$ would not produce a precipitate of $\text{Ba(OH)}_2$ from $\text{BaCl}_2\,(aq)$.
State the type of reaction occurring in reaction $4$.
Place $1\text{ cm}^3$ of $\text{MgCl}_2\text{(aq)}$ in a test-tube. Add a few drops of $\text{AgNO}_3\text{(aq)}$, then add $1\text{ cm}^3$ of dilute $\text{NH}_3\text{(aq)}$. State in full what is observed in this experiment.
When $1\text{ cm}^3$ of $\text{MgCl}_2\text{(aq)}$ is added to $1\text{ cm}^3$ of $\text{Br}_2\text{(aq)}$ in a test-tube, the solution stays orange. Explain this observation.