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5 marksOxidation – Reduction Reactions

CSEC Chemistry · January 2002 · Paper 2 · Question 3(f) [P2]

What would you expect to observe if a solution of iron(III) chloride were warmed with a simple sugar and some aqueous sodium hydroxide added? Write TWO ionic equations to support your answer.

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  1. 3(a)(i)a)Briefly discuss how ethanol can be obtained from a fermentation process, including reagents, reaction conditions, and relevant chemical equations.[4.5 marks]
  2. 3(a)(i)b)Briefly discuss how ethanol can be obtained from ethene, including reagents, reaction conditions, and relevant chemical equations.[4.5 marks]
  3. 3(a)(ii)Draw a fully labelled diagram of the apparatus which can be used to obtain a sample of ethanol from the fermentation product mixture.[4 marks]
  4. 3(a)(iii)How can it be determined that the sample collected in (a)(ii) above is ethanol?[2 marks]
  5. 3(b)Ethanol is oxidized in the body to CO2 and H2O, giving off 30 kJ per gram. Calculate the energy produced when 100 cm³ of an alcoholic drink (15% ethanol by…[2 marks]
  6. 3(c)State the chemical principles upon which the breath analyzer test for suspected drunken drivers is based.[3 marks]
  7. 3(a) [P2]State the name of Polymer A and the group of compounds to which it belongs.[2 marks]
  8. 3(b) [P2]Give the name and molecular formula of a simple sugar that can be formed from Polymer A.[2 marks]
  9. 3(c) [P2]State ONE difference in physical properties between Polymer A and a simple sugar.[1 mark]
  10. 3(d) [P2]Explain how a simple sugar can be used to supply energy in the human body, including a chemical equation.[4 marks]
  11. 3(e) [P2]To a mixture of Polymer A in water, excess dilute hydrochloric acid was added and boiled, then iodine was added. What would you observe?[1 mark]

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