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2 marksForces of Attraction

CAPE Chemistry Unit 1 · 2009 · Paper 2 · Question 4(b)(i)

When hydrochloric acid reacts with water and ammonia the corresponding hydroxonium and ammonium ions are formed.

Using the VSEPR theory, state the shapes of the hydroxonium (H3O+) and ammonium (NH4+) ions.

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Other parts of this question

  1. 4(a)State the basic principle behind the VSEPR theory.[1 mark]
  2. 4(b)(ii)Using suitable diagrams, illustrate the shape of EACH ion in (b) (i).[2 marks]
  3. 4(b)(iii)Account for the shape of EACH of the species, H3O+ and NH4+.[4 marks]
  4. 4(c)(i)The experimental determination of the relative molecular mass of ethanoic acid (CH3CO2H) produces a value of 120 g. Your answer should include a suitable…[4 marks]
  5. 4(c)(ii)The boiling point of propanone (acetone) is greater than the boiling point of butane.[2 marks]

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