What is meant by lattice energy?
Explain why the lattice energy of CaO is more exothermic than the lattice energy of LiF.
Use the data in the table to estimate approximate values for the lattice energies of magnesium oxide and barium oxide. $\Delta H_{\text{latt}}\, \text{MgO}(s) =$ ................. $\text{kJ mol}^{-1}$ $\Delta H_{\text{latt}}\, \text{BaO}(s) =$ ................. $\text{kJ mol}^{-1}$
Write an equation for the reaction between $\text{BaO}$ and $\text{H}_2\text{O}$. Include state symbols.
State and explain how the solubilities of the hydroxides of the Group 2 elements change down the group.
Use the data below and the relevant Data Booklet data to calculate the lattice energy of magnesium fluoride, $\text{MgF}_2(s)$. It may help to draw an energy cycle. Show your working. Electron affinity of $\text{F}(g) = -348\ \text{kJ mol}^{-1}$. Enthalpy change of atomisation of $\text{Mg}(s) = +147\ \text{kJ mol}^{-1}$. Enthalpy change of formation of $\text{MgF}_2(s) = -1102\ \text{kJ mol}^{-1}$. $\Delta H_{\text{latt}}\text{MgF}_2(s) =$ \ldots
Define electron affinity.
The electron affinity of carbon, $\text{C}(g)$, is $-120\ \text{kJ mol}^{-1}$. Suggest an explanation for why the electron affinity of fluorine differs from that of carbon.