CAIE A Level Chemistry 9701 · Chemical bonding
Sodium chloride, , and magnesium oxide, , are both ionic compounds. The melting point of is about 800 °C, while that of is about 2800 °C.
Compare the ionic bonding in these two compounds, including what is meant by ionic bonding, and explain why their melting points are so different.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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