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3 marksForces of Attraction

CAPE Chemistry Unit 1 · 2017 · Paper 2 · Question 4(a)

This section covers fundamental concepts in chemistry, including atomic orbitals and molecular geometry.

Apply the concept of the 'hybridization of atomic orbitals' to explain the planarity of the ethene molecule.

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  1. 4(b)(i)State TWO principles which form the basis of the valence-shell electron pair repulsion (VSEPR) theory.[2 marks]
  2. 4(b)(ii)Use the VSEPR theory to account for the difference in shape between the ammonia molecule (NH₃) and the ammonium ion (NH₄⁺). Ammonia molecule (NH₃): Ammonium…[4 marks]
  3. 4(c)Calculate the molar ratio of Cr₂O₇²⁻ to I⁻ and hence derive the ionic equation for the reaction which has occurred. Molar ratio: Ionic equation:[6 marks]

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