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  1. K

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s07_qp_1.pdf Please explain Q28 and 29
  2. K

    Biology; Chemistry; Physics: Post your doubts here!

    Sorry I didn't mean to be rude.
  3. K

    Biology; Chemistry; Physics: Post your doubts here!

    That is what usmam said! There may be something wrong with the mark scheme or they must have written the complete answer. They have asked for an element The answer is aluminum now please just accept it
  4. K

    Biology; Chemistry; Physics: Post your doubts here!

    It doesn't :P The mark scheme Has written the answer with respect to the question, the answer is Aluminum not aluminum oxide :P
  5. K

    Biology; Chemistry; Physics: Post your doubts here!

    Thank you so much!!
  6. K

    Biology; Chemistry; Physics: Post your doubts here!

    But then why is there a 2Cu2+ in the mark scheme? :(
  7. K

    Biology; Chemistry; Physics: Post your doubts here!

    Non metals form either neutral or acidic oxides, so there can be no non metal as the answer. All metals apart from amphoteric form basic oxides so they can't be the answer. Only amphoteric form both oxides and aluminum is amphoteric
  8. K

    Biology; Chemistry; Physics: Post your doubts here!

    That doesn't make any sense, from what I've studied, there is no charge on an ATOM. Only ions have charge
  9. K

    Biology; Chemistry; Physics: Post your doubts here!

    Because there was O2 on the left so to balance oxygen on the right we had to put a 2 before H2O and that meant there were 4 hydrogen now so thats why
  10. K

    Biology; Chemistry; Physics: Post your doubts here!

    Balancing is not done with respect to oxidation state But thanks
  11. K

    Biology; Chemistry; Physics: Post your doubts here!

    No it should be Cu + O2 + 4H+ = Cu2+ + 2H2O But in the mark scheme it's 2Cu + O2 + 4H+ = 2Cu2+ + 2H2O
  12. K

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s07_qp_2.pdf A8 (b) Why will there be 2 copper atoms in the Ionic equation?
  13. K

    Biology; Chemistry; Physics: Post your doubts here!

    It's B because we always divide the percentage composition of an element in a compound with it's Ar to find the empirical formula
  14. K

    Biology; Chemistry; Physics: Post your doubts here!

    Is it B?
  15. K

    Biology; Chemistry; Physics: Post your doubts here!

    Do past papers, if you're having difficulty in a question, then revise that topic from the book :)
  16. K

    Biology; Chemistry; Physics: Post your doubts here!

    Oh, thanks a lot!
  17. K

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s06_qp_1.pdf How does the experiment in Q29 work?
  18. K

    General paper discussion

    Thanks :) How did you prepare for maths btw? Topical past papers?
  19. K

    General paper discussion

    Wow that's pretty incredible, an A* in maths :) I hope I get the same
  20. K

    General paper discussion

    I messed up a little in the physics ATP, but I'll try my best in p1 & 2 I'm giving chemistry, physics, maths, English and bio You?
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