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3 marksThe Atmosphere

CAPE Chemistry Unit 2 · May/June 2023 · Paper 2 · Question 3(c)(ii)

Some Caribbean islands are encouraging citizens to use solar energy to generate electricity for household use.

Explain how this initiative will help maintain levels of oxygen and carbon dioxide in the atmosphere.

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Other parts of this question

  1. 3(a)(i)Write half-equations to represent the reactions taking place at the anode and cathode in the diaphragm cell.[2 marks]
  2. 3(a)(ii)Deduce ONE reason why the anode in the diaphragm cell is NOT made of steel.[1 mark]
  3. 3(a)(iii)Discuss TWO environmental concerns associated with EACH of the following: The production of chlorine using the diaphragm cell; The manufacture or use of PVC or…[4 marks]
  4. 3(b)(i)Identify the condition that causes a bond in CCl₄ to break in the upper atmosphere. Deduce an equation for the formation of the reactive species.[2 marks]
  5. 3(b)(ii)The reactive species formed from CCl₄ act as catalysts in the decomposition of ozone. Write TWO equations to show how EACH of these species acts as catalysts.[2 marks]
  6. 3(b)(iii)State the name given to this upper atmosphere.[1 mark]
  7. 3(b)(iv)Discuss the importance of the ozone layer to all life on planet earth.[2 marks]
  8. 3(c)(i)Identify the components labelled A, B, C, D and E in Figure 1.[5 marks]
  9. 3(d)(i)Define EACH of the following terms: Reuse, Reduce, Recycle.[3 marks]
  10. 3(d)(ii)Complete the table below outlining simple laboratory tests that would confirm the presence of Pb²⁺ and NO₃⁻.[4 marks]

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