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  1. xIshtar

    All chemistry Doubts here :)

    Read my solution to your problem? :p
  2. xIshtar

    i have 2 question in nov2007 paper 1 question no. 7 and 15

    Re: i have 2 question in nov2007 paper 1 question no. 7 and Biology Paper? You posted a Chem link.. Anyway, from the Paper linked.. 7: Covalent compounds are formed from non metals, so it is X and Y. Use the periodic table to identify the elements themselves, it is easier.. Answer = C. 15...
  3. xIshtar

    All chemistry Doubts here :)

    I'd just like to apologise for my poor drawing above :P If anyone needs help, I'll do my best :D
  4. xIshtar

    All chemistry Doubts here :)

    Estimate it using what percentage of air is oxygen, as it is used for the formation of the rust.. I'd say 150cm^3 As oxygen is 20 something percent of air. So C.
  5. xIshtar

    All chemistry Doubts here :)

    I did 4+7 = 11/2 5.5.. But the answer is 6, they expect you to know that? Question please.. You have taken too much OH off.. OH only comes off one end, the H just comes off the other end as there is a continuation.. It may be easier if you draw the structural formula, I find it easier that...
  6. xIshtar

    All chemistry Doubts here :)

    -OOC-C6-H4-CO-O-CH2-CH2-O- I personally put the Hs on the end, but I'm not sure if it's correct to, as you have to show continuation..
  7. xIshtar

    Any paper 1 NOTES

    Cheers.. I'm hoping for 38 +... It's what I've been averaging in Paper 1 Past Papers... I wish everyone the best of luck with their last exams. (4 to go for me) May the papers be a nice and enjoyable experience.
  8. xIshtar

    All chemistry Doubts here :)

    And according to the mark scheme, what I said is right :D
  9. xIshtar

    All chemistry Doubts here :)

    Ahhh! I think I get it.. Iron (iii) is 3+, and Iron (ii) is 2+, and thus, Only 2/3 of the volume would be used, so it would level off at 8cm^3 of Sodium Hydroxide, but still producing the same height ppt.
  10. xIshtar

    All chemistry Doubts here :)

    Hmm, I'm stumpted with 4(b) (ii) But I can do 4.(b)(iii) : Look at the chemicals used, aluminium and sodium hydroxide. So, as the amount used increase into excess, the precipitate will dissolve, meaning that it will go up, then steeply back down again. I'll have another look for (ii) too.
  11. xIshtar

    All chemistry Doubts here :)

    The temperature decreases as the reaction is endothermic You know that 1000cm^3 produces a 10C reduction, so half the volume will produce double the temperature change as it is less saturated...
  12. xIshtar

    All chemistry Doubts here :)

    Heh, I don't see much of an explanation why oxide and carbonate are needed rather than chloride or nitrate.. In all honesty, carbonate and oxide are the first things that come to me first.. 92.3/ Rmm of Carbon = 7.7 (1dp).. 7.7:7.7 = 1:1. This one is pretty simple.. Mole Ratio = 1:6.5 =>...
  13. xIshtar

    All chemistry Doubts here :)

    What I wrote too (:
  14. xIshtar

    All chemistry Doubts here :)

    There would be a temperature decrease of 20C, as the reaction is endothermic, and there is a smaller volume of solvent.
  15. xIshtar

    Curve for Chemistry and Physics cancelled ??

    D:
  16. xIshtar

    Curve for Chemistry and Physics cancelled ??

    If this is true, I just died a little inside..
  17. xIshtar

    LINKS TO NOTES AND STUDYING.

    :ROFL:
  18. xIshtar

    LINKS TO NOTES AND STUDYING.

    Question, how much do you get paid everytime someone visits?
  19. xIshtar

    Biology Paper 1 REVISION

    My last exam (:
  20. xIshtar

    All chemistry Doubts here :)

    No problem, if you need anything else, just post here xP
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