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  1. S

    Chemistry: Post your doubts here!

    hwo come an ideal gas's volume is not inversely proportional to it's pressure??
  2. S

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w12_qp_11.pdf can some one explain Q11 please??
  3. S

    Chemistry: Post your doubts here!

    Bonding pair or you mean bonding electrons?
  4. S

    Chemistry: Post your doubts here!

    I don't think there's H2O right!
  5. S

    Chemistry: Post your doubts here!

    alsalum allyakom http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_11.pdf in question 21 was is the answer 3 and not 4? and...
  6. S

    Chemistry: Post your doubts here!

    thank thank you
  7. S

    A level Biology: Post your doubts here!

    But that's what I've studied ,it's in the book it's written in the book that: the overall efficiency of energy transfer from producer to consumer is rarely greater than 10% similar losses occur at each trophic level.so as energy is passes along a food chain , less and less energy si available at...
  8. S

    A level Biology: Post your doubts here!

    als alum allaykom http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w10_qp_11.pdf in question 39 , WHY THERE'S A PERCENTAGE OF ENERGY TRANSER OF 80? and 20? isn't always 10% between the trophic levels? and 1% between sun and producer?
  9. S

    Chemistry: Post your doubts here!

    why there can't be a cis-trans isomer in a ring? I did construct a balanced equation and got the mole ratio of AL2O3 to HCL 1:6 but my final answer was 60 instead of 30
  10. S

    A level Biology: Post your doubts here!

    yeah I figured out it should be enzyme reaction because there's no radiation of energy in a mitochondrion just production of packets of energy :p you don't get what point?
  11. S

    A level Biology: Post your doubts here!

    I would go for niche ,because they say it carries out photosynthesis and they're only talking about the tree's role in the environment and they say many organisms live in it , so it shows that it has a role of being a...
  12. S

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_11.pdf in question 29 , how B is the answer?
  13. S

    Chemistry: Post your doubts here!

    alsalum allaykom http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_11.pdf I don't understand why in question 24 D is incorrect , any one help please?and in question 13 can some one explain the answer please?
  14. S

    Chemistry: Post your doubts here!

    If your teacher made you understand in a different way ,then it doesn't matter I guess right!
  15. S

    Chemistry: Post your doubts here!

    oh ok thanks , so the ideal gas equation can actually be used for any gas ?
  16. S

    Chemistry: Post your doubts here!

    oh ok thanks , so the ideal gas equation can actually be used for any gas ?
  17. S

    A level Biology: Post your doubts here!

    hehehe , you mean that I put a lot of posts? may be , I guess I have a lot of doubts and my p1 is 4 days ahead , so I should be fully prepared :p..but mashallah you're excellent in bio :D
  18. S

    Chemistry: Post your doubts here!

    in the first question , where there is NH2 that mean that's where the Br was because this reaction is a nucleaphilic substitution reaction so the nucleaphile which is the NH3 will displace the weaker nucleaphile which is the Br and a hydrogen will replace the other bromine , so from the diagram...
  19. S

    Chemistry: Post your doubts here!

    yeah you're right :) .. so you got it ? great to hear that that question 29 was exhausting:confused:
  20. S

    Chemistry: Post your doubts here!

    okay give me a sec.:)
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