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2 marksAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · 2005 · Paper 2 · Question 5(c)(i)

In a lead-storage automobile battery, the cathode is PbO2, the anode is Pb, and the electrolyte is H2SO4.

Use the data booklet to write equations for the reactions occurring at each electrode during discharge of the lead-storage battery.

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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)(ii)Calculate the standard cell potential for the lead-storage battery.[2 marks]
  7. 5(d)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.[3 marks]

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