Chemistry · Unit 1 · Properties and structure of materials · Compounds and mixtures
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Sodium chloride (NaCl) has a melting point of 801 °C, while iodine (\(\text{I}_2\)) has a melting point of 114 °C. Explain why sodium chloride has a higher melting point than iodine in terms of bonding and structure.
Which property is best explained by the type of bonding in magnesium metal?
A student compares three pure solid substances labelled P, Q and R. Substance P has a high melting point and conducts electricity when molten but not when solid. Substance Q conducts electricity in the solid state and is malleable. Substance R has a low melting point and does not conduct electricity in any state. Explain which type of bonding is present in substance Q.