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2 marksEthanol

CAPE Chemistry Unit 2 · May/June 2021 · Paper 2 · Question 3(c)(iv)

Ethanol is used in mouthwash formulations in addition to active ingredients such as menthol, thymol and eucalyptol. The purpose of these ingredients is to aid in the breakdown of plaque on teeth.

Describe the role of ethanol in this process.

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Other parts of this question

  1. 3(a)(i)State ONE reason why a catalyst is needed in this reaction.[1 mark]
  2. 3(a)(ii)Using Le Chatelier's principle, explain the effect of temperature on the direction of equilibrium for the ammonia formation.[2 marks]
  3. 3(a)(iii)State whether the temperatures used in the Haber-Bosch synthesis favour the formation of high yields of ammonia.[1 mark]
  4. 3(a)(iv)Comment on the statement “High pressure conditions favour the formation of ammonia in high yields."[2 marks]
  5. 3(a)(v)With reference to Figure 1 on page 13, state TWO possible design limitations that could lead to reduced product yield.[2 marks]
  6. 3(a)(vi)Write the Kₚ expression for the Haber–Bosch process.[1 mark]
  7. 3(a)(vii)State the impact of the catalyst on the Kₚ of the reaction.[1 mark]
  8. 3(b)(i)Complete statement (i).[1 mark]
  9. 3(b)(ii)Complete statement (ii).[1 mark]
  10. 3(b)(iii)Complete statement (iii).[2 marks]
  11. 3(b)(iv)Complete statement (iv).[2 marks]
  12. 3(b)(v)Comment on the statement "The production of ammonia under standard atmospheric conditions would prove to be more efficient in the presence of a catalyst than…[2 marks]
  13. 3(b)(vi)Identify another feature in the design that makes it 'green', apart from the use of a catalyst in the existing Haber-Bosch process.[1 mark]
  14. 3(c)(i)Write ONE equation that represents a step in this process.[2 marks]
  15. 3(c)(ii)Write TWO statements that support the idea that ethanol is a green resource.[1 mark]
  16. 3(c)(iii)State TWO factors that would preclude countries in the Caribbean from considering sugar beets as a viable source crop for ethanol production.[2 marks]
  17. 3(c)(v)Match EACH formulation using the letters A, B or C with the appropriate set of characteristics that best describes it.[3 marks]

More practice: the rest of this paper · more Ethanol questions · all CAPE Chemistry Unit 2 past papers