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1 markForces of Attraction

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

Valence Shell Electron Pair Repulsion (VSEPR) theory is normally used to predict the shapes and bond angles of simple molecules and ions.

State the basic principle behind the VSEPR theory.

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Other parts of this question

  1. 4(b)(i)Using the VSEPR theory, state the shapes of the hydroxonium (H3O+) and ammonium (NH4+) ions.[2 marks]
  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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