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3 marksForces of Attraction

CAPE Chemistry Unit 1 · 2016 · Paper 2 · Question 4(b)(ii)

Account for EACH of the following statements: The molecules of aluminium fluoride in the presence of ammonia forms a white solid of formula NH₄AlF₄. (Include an appropriate equation in your account.)

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  1. 4(a)(i)Describe how the bonds are formed in EACH of the solids, potassium chloride and iodine.[4 marks]
  2. 4(a)(ii)Complete Table 3 by comparing the physical properties of potassium chloride (KCl) and iodine (I₂).[2 marks]
  3. 4(b)(i)Account for EACH of the following statements: The boiling point of H₂O is higher than that of H₂S.[3 marks]
  4. 4(c)Explain the difference between the shapes of NH₃ and NH₄⁺.[3 marks]

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