• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. messi10

    Hi :)

    Hi :)
    • messi10
    • Profile post
  2. messi10

    Chemistry: Post your doubts here!

    These require a lot of practice.. Same here :'(.... Try to help others here, Allah will give you the reward. InShaAllah.
  3. messi10

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_13.pdf Q # 18 and 28 please.
  4. messi10

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_12.pdf need help with Q # 19, 23 and 24. Edit: This one as well, anyone...
  5. messi10

    Chemistry: Post your doubts here!

    In this question.. Enthalpy change of combustion is given, but "enthalpy change of formation" is asked, so switch sign of every value.
  6. messi10

    Chemistry: Post your doubts here!

    I know, but my sir said that to get sign you must do "Reactant-Product", not ""product-reactant".. This is confusing me, please let me know this thing.
  7. messi10

    Hay there :)

    Hay there :)
    • messi10
    • Profile post
  8. messi10

    Chemistry MCQ thread...

    These are reactions that occur, whenever there is car combustion reactions, recall these reactions: 1. NO2 + CO => N2 + CO2 2. NO + SO2 => N2 + SO3 3. NO2 + SO2 => NO + SO3 (This one rarely occurs) Discussing all the options: A - CO is not SPONTANEOUSLY oxidized B - NO2 is not reduced to NO by...
  9. messi10

    CHEMISTRY PAPER 1

    That is a basic concept of organic. C-C-C-OH -- That is prop-1-ol, means OH is attached to 1st carbon - This is also primary alcohol C-C(OH)-C -- That is prop-2-ol. OH is attached in chain to 2nd carbon. - This is also called secondary alcohol. C-C(CH3)2-C-OH - This is 2,2...
  10. messi10

    Chemistry: Post your doubts here!

    For Q9 , I also need help.!! Please help me with all such questions if you get the answer. lol For Q11: 1 mole of each substance is reacted. equation is: C2H5OH + CH3CO2H => CH3CO2C2H5 + H2O 1-x mole of C2H5OH remained 1-x mole of Ch3CO2H remained x mole of Ch3CO2C2H5 formed x mole of H2O...
  11. messi10

    Chemistry: Post your doubts here!

    Thank you very much, that did help.. I was thinking in ( Reactant - Product = delta Hf ) way. But then what happened in this question.. In this question"Reactant - Product" should give correct answer with sign, but it give opposite sign answer.. Can you please help here..
  12. messi10

    Chemistry: Post your doubts here!

    Okay.. Q4: Remember: Bond Forming is Exothermic (- H) and Bond Breaking is Endothermic (+H) P - Br-Br bond is broken: +193 Energy Q - Cl-Cl bond is formed: -244 Energy R - C-Cl bond is formed: -344 Energy S - CH bond is broken: +410 Energy Arrange this in most negative to most positive you get...
  13. messi10

    Chemistry: Post your doubts here!

    For Q39, Answer must be B as 1 and 2 are correct (not C), because: "1. CO is removed by oxidation, the equation is NO + CO => N2 + CO2 (Harmful CO is oxidized from +2 to +4 (whereas N went to 0 from +2)- so, CO is oxidized, NO is oxidizing agent in it, itself reduced) 2. Hydrocarbons are always...
  14. messi10

    Chemistry: Post your doubts here!

    Need help with this MCQ.. How you determine the sign?? Ans is D.. How you determine the sign... How you solved it... please write the calculation.
  15. messi10

    how to prepare for Chemsitry P1 (m.c.qs)

    I think I'll be screwed in P1 - chemsitry 9701. I just started preparing for chemistry m.c.q. I have done 2 or 3 papers, and they are hell difficult. I get 2 or 3 correct in every 10 mcqs. I will surely do all the latest papers, but are there any other tips that can help me out with this...
  16. messi10

    HOW WAS CHEMISTRY PAPER 22 ?

    mole and organic colour changes nailed me.. lol
  17. messi10

    Phy practical 33 on 6th Nov

    my gradient was 6.3 :'( This means, its wrong!! not in 3-6 range!
  18. messi10

    Chemistry: Post your doubts here!

    Please quick reply, 1. how alcohol is directly formed from alkAne. 2. how alcohol are directly reduced to AlkAne.
  19. messi10

    Physics 9702/33 Practical Exam taken, time to Rate it!

    It was tough, My graph was a mess :'( And what was the relation in Q2. v remained constant or not? Seem, i'll have to repeat in May/June 2013!
  20. messi10

    Phy practical 33 on 6th Nov

    What the hell.. how dumb I am.. forgot to mention the year... lol.. now of no use.. sorry guys.
Top