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1 markEthanol

CAPE Chemistry Unit 2 · 2011 · Paper 2 · Question 3(e)(iii)

An apparatus is set up to illustrate fermentation with a suspension of A and B in a flask connected to a beaker containing Ca(OH)2(aq).

Give a reason why very high temperatures must be avoided during fermentation.

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Other parts of this question

  1. 3(a)Outline the THREE principles of the primary distillation of crude oil.[3 marks]
  2. 3(b)(i)Define the term 'cracking'.[1 mark]
  3. 3(b)(ii)Define the term 'reforming'.[1 mark]
  4. 3(c)Write the balanced equation representing the cracking of octane to produce two hydrocarbons, one of which is butane.[2 marks]
  5. 3(d)State THREE uses of the products of cracking in the manufacture of petrochemicals.[3 marks]
  6. 3(e)(i)State the names of the substances A and B in the suspension.[2 marks]
  7. 3(e)(ii)State what would be observed after a period of time in the conical flask and the beaker.[2 marks]

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