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  1. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    help please: (a) why ozone is important in terms of human health? [2] (b) write the reaction for the conversion ozone to oxygen by CFC?
  2. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    good job! thanks:D
  3. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    do we need to learn the tests for Ba2+ Ca2+ Pb2+ and I- Br- ions...these are not seen often in past papers?
  4. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    not really memorize, but u can guess them like most metal oxides are dark in colour (CuO Fe2O3), FeSO4 should be green as the test for Fe2+ is green ppt, u should know the tests for ions and the colours can be predicted from those (BaSO4 is white solid /test for SO4 radicals, Fe2SO4 is...
  5. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    thanks:) and one more, if i can bug u again, Q15 same year. thanks in advance:D
  6. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    if aqueous sodium chloride is electrolysed, the OH- ions should move to anode and produce O2 right? Cl2 can only be producd using conc solution? mark scheme say different, any1 pls explain:(
  7. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    First find the moles of iodine molecules, 2.54/(127*2) = 0.01 mol then conc = mol/vol ; remember to convert vol in dm3:)
  8. Salman Rahman

    Chemistry Doubts: Paper 1 & 2

    my chemistry p4 went super!:cool:, xpecting min - 57/60. yup, it is possible that p1 and p4 might be difficult, my mentors said too.
  9. Salman Rahman

    ~~jokes?? in here?? really??

    that was really a good one :D:LOL::ROFLMAO:(y)
  10. Salman Rahman

    ~~jokes?? in here?? really??

    :D ha! ha! ha! :rolleyes:
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