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1 markAluminium

CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 6(b)(ii)

State the acid/base character of Al2O3.

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  1. 6(a)Complete Table 4 by stating the type of bonding present in Na2O, MgO, Al2O3, AlCl3, SiCl4, and PCl5.[6 marks]
  2. 6(b)(i)State the acid/base character of MgO.[1 mark]
  3. 6(c)(i)Write a balanced equation for the reaction of Na2O with water.[2 marks]
  4. 6(c)(ii)Write a balanced equation for the reaction of SiCl4 with water.[2 marks]
  5. 6(c)(iii)Write a balanced equation for the reaction of PCl5 with water.[2 marks]
  6. 6(d)Give the approximate pH of the solution formed from the reactions in (c)(i) and (c)(ii).[2 marks]
  7. 6(e)Explain why SiCl4 is a liquid at room temperature and pressure whereas SiO2 is a solid with a high melting point, in terms of structure and bonding.[4 marks]

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