A-LevelChemistryChemical periodicity9701/23 · May/June 2025 · Q28 Marks
The chemical properties of oxides are related to the chemical bonding present in these compounds.
- (a)A Period 3 oxide produces a solution with a pH greater than 10 when it is added to water. State the formula of the oxide.[1]
- (b)P₄O₁₀ is added to an excess of aqueous NaOH. Write an equation to describe the reaction.[1]
- (c)(i)Identify the oxide from Table 2.1 that contains the element with the highest oxidation number.[1]
- (c)(ii)A student suggests the following hypothesis. The melting point of an ionically bonded oxide is only determined by the charge on the cation. Use Table 2.1 to deduce if this hypothesis is true or false or if there is not enough information to make a conclusion. Explain your answer.[2]
- (d)State why ZnO is described as a Brønsted–Lowry base when it is added to H₂SO₄(aq).[1]
- (e)(i)State the formula of the aluminium-containing species produced when Al₂O₃ reacts with NaOH(aq).[1]
- (e)(ii)State the formula of the aluminium-containing salt produced when Al₂O₃ reacts with H₂SO₄(aq).[1]
Mark scheme
Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.
- [1] Na₂O
- [1] P₄O₁₀ + 12NaOH → 4Na₃PO₄ + 6H₂O
- [1] SO₃
- [2] • false • Al₂O₃ melting point is lower than MgO • (but) charge on Al ion is greater than that on Mg Any 2 points = 1 mark, all 3 points = 2 marks
- [1] it/ZnO accepts protons
- [1] NaAl(OH)₄
- [1] Al₂(SO₄)₃
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