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1 markElectrochemistry

CSEC Chemistry · May/June 2014 · Paper 2 · Question 4(b)(i)

Figure 5 shows a diagram of apparatus proposed by students to investigate the electrical conductivity of aqueous lead(II) nitrate, ethanol, and aqueous ammonia.

Why is the circuit as represented in Figure 5 not suitable to achieve the aim of the experiment?

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Other parts of this question

  1. 4(a)(i)With reference to the bonding, account for the differences in states and melting points of the oxides of magnesium and sulfur.[6 marks]
  2. 4(a)(ii)Explain whether the oxides will conduct electricity and, if so, under what conditions.[4 marks]
  3. 4(b)(ii)Modify the diagram to produce a circuit that is suitable for achieving the aim of this experiment.[2 marks]
  4. 4(b)(iii)Classify the three substances to be investigated (aqueous lead(II) nitrate, ethanol and aqueous ammonia) EITHER as conductors OR non-conductors.[2 marks]

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