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2 marksQualitative Analysis

CSEC Chemistry · January 2012 · Paper 2 · Question 4(a)(ii)b)

Sodium and potassium react vigorously with water at room temperature.

Outline ONE test that can be used to identify any gas that is produced during the reaction.

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Other parts of this question

  1. 4(a)(i)Write the electronic configuration of sodium and state a reason for its placement in Period 3.[2 marks]
  2. 4(a)(ii)a)Write a balanced equation for the reaction of sodium with water.[2 marks]
  3. 4(a)(ii)c)Predict the reactivity of X with water as compared with sodium and potassium.[1 mark]
  4. 4(a)(iii)Give ONE test that can be used to distinguish the solution of the oxide of Element Y from the solution of the oxide of sulphur.[2 marks]
  5. 4(b)(i)Write a balanced IONIC equation for the overall reaction, and identify the species being oxidised and reduced.[4 marks]
  6. 4(b)(ii)Account for the difference in reactivity of chlorine and iodine towards iron(II).[2 marks]

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