This question is about magnesium, magnesium oxide and magnesium sulfate. Magnesium oxide and magnesium sulfate are ionic compounds. (i) Draw a dot-and-cross diagram to show the bonding in magnesium oxide, MgO. Show outer electrons only. (2) (ii) The melting temperatures of magnesium oxide and magnesium sulfate are $$$2852^{\circ} \mathrm{C}$$$ and $$$1124^{\circ} \mathrm{C}$$$ respectively. Explain why the melting temperature of magnesium oxide is significantly higher than that of magnesium sulfate. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Chemistry

IGCSE&ALevel

EDEXCEL

Exam No：wch11-01-que-20240111 Year：2024 Question No：20(b)

Answer:

An answer that makes reference to the following points:
- correct structure of Mg ion and charge
- correct structure of O ion and charge
An answer that makes reference to the following points:
- oxide/ $\mathrm{O}^{2-}$ smaller than sulfate/ $\mathrm{SO}_{4}{ }^{2-}$
- stronger (electrostatic) attraction between the $\left(\mathrm{Mg}^{2+}\right.$ and $\mathrm{O}^{2-}$ ) ions

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