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  1. H

    Condensation polymerisation !!

    Thanks a lot xishtar and brainiac :D
  2. H

    Condensation polymerisation !!

    But in the past papers i saw that h20 is eliminated from the middle and OH or H is eliminated from the end of both monomers :unknown: :%) :shock: :x
  3. H

    Condensation polymerisation !!

    Can someone explain me about Condensation polymerisation with an example? I want to know about the removal of H2O and H during the reaction :bad:
  4. H

    All chemistry Doubts here :)

    http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_1.pdf 9th question y the answer cant be barium sulphate? is it cuz it is insoluble in water? :P
  5. H

    Chemistry Paper 1 Doubts Here... !

    The answer is B cuz here they are asking about filtration and in filtration there has to be one insoluble and one soluble compound.In B insoluble compound is calcium carbonate and soluble one is sodium chloride so both can be separated by filtration :D
  6. H

    May/June 2011 exams

    For an A* it will not be 95%, it will be 88% (including speaking skills) :P
  7. H

    May/June 2011 exams

    Getting 95% in a language is very hard :(
  8. H

    Pls Help !! Chemistry paper 3 ???

    yaa, i am sure and xishtar check ur pm plz... 8)
  9. H

    Pls Help !! Chemistry paper 3 ???

    In mark scheme is is written y=2 and x= 5-2=3 :P
  10. H

    Pls Help !! Chemistry paper 3 ???

    Give me the link plz....
  11. H

    All chemistry Doubts here :)

    Keemoman, the answer is HOOCCH=CHCOOH but can we write it as CCOOHH=CHCHOO ? and how do u know if its a weak acid or not? and what is the meaning of 1 mole of acid produced 2 moles of H+ ? :unknown:
  12. H

    All chemistry Doubts here :)

    Question:- http://www.xtremepapers.me/CIE/Cambridg ... _qp_33.pdf 5 (b) (iv) Mark scheme:- http://www.xtremepapers.me/CIE/Cambridg ... _ms_33.pdf I am not able to understand the meaning of the word "dibasic" and from where the double bond came :(
  13. H

    All chemistry Doubts here :)

    i am not saying that ur diagram didnt help, but i didnt understand that H and OH thing, so i wanted to have a look at that book. Do u have the pdf file of that book?
  14. H

    All chemistry Doubts here :)

    Can u tell me where these things are written.. and in which book?
  15. H

    All chemistry Doubts here :)

    I saw it in the diagram but as H20 is eliminated from both sides, that O in the end should not be there but in the diagram it is there.Thats what i was asking in the previous post "From where did the O come from" :P :%)
  16. H

    All chemistry Doubts here :)

    Hey, u added a O at the last but from where that O came? :P
  17. H

    All chemistry Doubts here :)

    Here u have to apply ur math knowledge. In air there is 20% of oxygen. So therefore 80% of x =x-30 (x is the total air) 80x=100x-3000 -20x=-3000 x=150cm^3 You can also cross-check ur answer 80% of 150=120 150-120=30 Therefore 30cm^3 is reduced :D
  18. H

    All chemistry Doubts here :)

    See what i think is, if H and OH will go from both sides, the polymer should be :- -OC-C6H4-COOCH2CH2-0- My polymer is correct, but in the mark scheme they are adding one more O in the start :- -OOC-C6H4-COOCH2CH2-0- and i dont understand why there is this addition :unknown:
  19. H

    All chemistry Doubts here :)

    http://www.xtremepapers.me/CIE/Cambridg ... 4_qp_3.pdf Question 6 (b) (i) In this question i know that its a ester linkage and also i know that OH goes from acid and H from alcohol at both ends, but i think there is a extra O in the starting which is written in the mark scheme :P Hydroxide...
  20. H

    All chemistry Doubts here :)

    http://www.xtremepapers.me/CIE/Cambridg ... 4_qp_3.pdf Question 4(b) (ii) and (iii) Plz help me :D
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