Quelpr
2 marksThe Atmosphere

CAPE Chemistry Unit 2 · 2010 · Paper 2 · Question 3(a)(ii)

Identify a natural source for each of the two gases identified in (a)(i).

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 3(a)(i)Identify two gases present in unpolluted air that contribute to rain water having a pH of 5.6.[2 marks]
  2. 3(a)(iii)Write a balanced chemical equation showing the reaction of one of the gases from (a)(i) with water.[2 marks]
  3. 3(b)(i)Briefly outline two factors responsible for acid rain in industrialized, heavily populated areas.[2 marks]
  4. 3(b)(ii)Suggest two environmental effects of acid rain.[2 marks]
  5. 3(c)(i)Suggest a precaution you would take to ensure no external contamination occurs when sampling potable water suspected of containing Pb^2+ and NO3^- ions.[1 mark]
  6. 3(c)(ii)Name one reagent used to confirm contamination by Pb^2+ and one reagent to confirm contamination by NO3^-.[2 marks]
  7. 3(c)(iii)State the expected observations for the tests using the reagents named in (c)(ii) if Pb^2+ and NO3^- are present.[2 marks]

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