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3 marksAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · 2005 · Paper 2 · Question 5(d)

The Apollo fuel cell uses H2 and O2 with porous carbon electrodes.

By reference to standard electrode potentials in the data booklet, deduce the useful by-product of the H2-O2 fuel cell reaction, including relevant equations.

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  1. 5(a)(i)Explain the "muscle twitch" observed by Galvani when frog leg muscles were touched simultaneously by two different metals.[1 mark]
  2. 5(a)(ii)Describe with the aid of a diagram the experiment that Volta might have performed using TWO named metals to produce electricity.[3 marks]
  3. 5(a)(iii)Describe how the apparatus in (a)(ii) can be modified to determine the standard electrode potential.[5 marks]
  4. 5(b)(i)Stain removers oxidize coloured compounds to colourless complexes. Suggest ONE reason why an ozone-producing formulation is believed to produce brighter,…[2 marks]
  5. 5(b)(ii)Comment on the suggestion that chlorine can be produced by bubbling ozone through sea water.[2 marks]
  6. 5(c)(i)Use the data booklet to write equations for the reactions occurring at each electrode during discharge of the lead-storage battery.[2 marks]
  7. 5(c)(ii)Calculate the standard cell potential for the lead-storage battery.[2 marks]

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