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2 marksEthanol

CAPE Chemistry Unit 2 · May/June 2026 · Paper 2 · Question 3(b)(iii)

Fermentation is a process used to produce ethanol from carbohydrates using yeast.

Ethanol produced from sugar cane residues is used instead of petrol as a fuel in cars. State ONE advantage and ONE disadvantage of this practice. Advantage. Disadvantage.

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Other parts of this question

  1. 3(a)(i)Outline the principles involved in EACH of the following processes. Fractional distillation. Cracking.[5 marks]
  2. 3(a)(ii)Octane, C8H18, can be cracked to form ethane and one other hydrocarbon. Write an equation to show this reaction.[2 marks]
  3. 3(a)(iii)Reforming is a technique used to produce cycloalkanes from straight chain alkanes. Using an equation, show how cyclomethylhexane can be formed by reforming.[4 marks]
  4. 3(a)(iv)Incomplete combustion of petroleum products releases carbon monoxide, unburnt hydrocarbons and carbon particles into the environment. Describe how any ONE…[3 marks]
  5. 3(b)(i)Using appropriate equations, show how starch can be converted to ethanol.[4 marks]
  6. 3(b)(ii)It is important to have safety requirements in an ethanol plant. State TWO properties of ethanol that are considered when making the ethanol plant safe.[2 marks]
  7. 3(b)(iv)Explain how the overconsumption of ethanol could have a negative economic impact on a society.[3 marks]
  8. 3(c)Outline an experimental procedure that can be used to determine if Brand A white rum has a higher ethanol content than Brand B white rum.[5 marks]

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