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3 marksThe Atmosphere

CAPE Chemistry Unit 2 · 2005 · Paper 2 · Question 9(c)(i)

Every day approximately 3 x 10^8 tons of stratospheric ozone are formed and destroyed in a natural cycle.

Explain the underlying chemical principle in this natural steady-state process of ozone formation and destruction.

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Other parts of this question

  1. 9(a)(i)Explain the need for concern regarding ozone depletion and human health.[5 marks]
  2. 9(a)(ii)Describe THREE properties of CFCs that contributed to their widespread use.[3 marks]
  3. 9(b)(i)Suggest TWO properties of ammonia that led to its replacement by CCl2F2.[2 marks]
  4. 9(b)(ii)Use CFC-12 as an example to write chemical equations that demonstrate the impact of CFCs on the ozone layer.[5 marks]
  5. 9(c)(ii)Write chemical equations representing the natural processes of formation and destruction of ozone.[2 marks]

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