(a)[1]
Suggest one further physical property of hydrogen sulfide.
(b(i))[1]
Give an equation to represent the dissociation of hydrogen sulfide.
(b(ii))[1]
Why is aqueous hydrogen sulfide referred to as a weak acid?
(c)[3]
Aqueous hydrogen sulfide reacts with aqueous potassium hydroxide. $\text{H}_2\text{S(aq)} + 2\text{KOH(aq)} \rightarrow \text{K}_2\text{S(aq)} + 2\text{H}_2\text{O(l)}$ What is the minimum volume, in cm$^3$, of $0.150\,\text{mol dm}^{-3}$ KOH needed to react completely with a solution containing $0.170\,\text{g}$ of H$_2$S?
(d(i))[2]
Predict two physical properties of magnesium sulfide.
(d(ii))[2]
Explain, in terms of electrons, how a magnesium atom reacts with a sulfur atom to form a magnesium ion and a sulfide ion.