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  1. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    O/N 2013 paper 2 OMG! :( :(
  2. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    correct answer is C, note that Q are hollow tubes so they are xylem..(conduct water) the sieve plates make the phloem appear to have the tiny holes...(phloem conducts the sugars) :)
  3. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    guys can anyone tell me about the following: -renal vein -renal artery -hepatic vein -hepatic artery -hepatic portal vein thanx!! :)
  4. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    no my water in/out is correct i just made a beaker instead of flask to make it "open" i think yea its correct.......
  5. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    i made the appratus just like made in this question of o/n/41 this had errors which i stated in the pic tell if i had corrected the apparatus making it "open" is it correct?
  6. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    there was an electric heater in a question diagram, but yea both are correct according to me.
  7. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    one mark 100% sure
  8. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    is electric heater instead of water bath correct? i saw it in a diagram of a question....
  9. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    in distillation diagram i made the -condenser -beaker -bungs -thermometer -electric heater -water in and out are these enough?
  10. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    they will, if it's clearly shown that you were not confused. and ticked the other by mistake.......
  11. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    i remember they were 9 ,4.5 ,7 ,3.5
  12. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    guys in last question last part the temperature was to be halved and volumes same as of previous part right?
  13. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    paper went gr8 :D Alhamdulillah. Just got the color of AgBr wrong :/
  14. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    this is the reason that marking scheme giving us an option between all 3 colours yellow [iron(iii)sulfate],green (iron(ii)sulfate),and colourless as solution is very dilute and colours barely visible. all questions (2004-2013) including this iron(ii)sulfate and potassium permanganate titration...
  15. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20%285070%29/5070_s11_qp_42.pdf Q.8)d)
  16. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    moles of water/moles of FeSO4 =0.158/0.0223=7.09 x=7.09
  17. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    yellow is in marking scheme because very little fe3+ ions presant which instead of giving red-brown, will give yellow as they are very less (DILUTE SOLUTION)
  18. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    i agree (y)(y)(y)
  19. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    it is added till the "end point",which i think makes KMnO4 not in excess...... but do tell me how it is in excess if i am incorrect.......:)
  20. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    green/yellow/colourless- to- purple as the solution(P) in flask is very dilute it will show a very light colour (a mixture of the fe 2+ and fe 3+ ions) its not red-brown or dirty green as solution DILUTE. when potassium manganate(VII) is added, the solution changes colour as potassium manganate...
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