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4 marksStructure and Bonding

CSEC Chemistry · January 2013 · Paper 2 · Question 2(a)(iv)

A sample of solid sodium chloride (NaCl) was contaminated with iodine crystals (I₂). A student suggested separating iodine from sodium chloride by gently heating the mixture, as shown in Figure 3.

By comparing the forces of attraction between the NaCl particles and the I₂ molecules, explain why gentle heating is suitable for separating I₂ from a mixture of NaCl and I₂.

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Other parts of this question

  1. 2(a)(i)State the name of the process being used in Figure 3 to separate the iodine from sodium chloride.[1 mark]
  2. 2(a)(ii)Describe what should be observed when the sample of NaCl and I₂ is heated.[3 marks]
  3. 2(a)(iii)Using dot cross diagrams, show the bonding in NaCl.[3 marks]
  4. 2(b)(i)State whether the method outlined in Figure 3 is suitable for separating the Fe from NaCl.[1 mark]
  5. 2(b)(ii)With reference to the bonding in Fe, explain your answer to (b) (i).[3 marks]

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