Calculate the percentage by mass of tin present in SnO₂.
State what the term amphoteric means.
Write the symbol equation for the reaction of SnO₂ with NaOH.
Suggest why this is unusual for a metal.
Complete the dot‑and‑cross diagram in Fig. 3.1 for a molecule of SnCl₄. Show only the outer-shell electrons.
Explain, in terms of structure and bonding, why SnCl₄ melts at a much lower temperature than SnO.
Explain why a reaction does not occur.
Write an ionic equation for any reaction that happens in each experiment. If there is no reaction, write ‘no reaction’.
State what the term hydrated means.
Complete the decomposition equation for Sn(NO₃)₂·20H₂O. $2\text{Sn(NO}_3)_2\cdot20\text{H}_2\text{O} \rightarrow \ldots\text{SnO} + \ldots\text{NO}_2 + \text{O}_2 + \ldots\text{H}_2\text{O}$