• 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. Aymen Ezazi

    Chemistry: Post your doubts here!

    in this enthalpy change of reation= enthalpy change of formation of Fe2O3 .. and there are 2 moles.. so divide it by 2 u get -824 which is B..
  2. Aymen Ezazi

    Chemistry: Post your doubts here!

    its not B bcoz as they have given in the example that –CH2CO2CH3 forms from CH3CO2CH3 and we will keep that as it is as in C and D.. now an aldehyde reacts which is formed from primary alcohal so D is wrong bcoz its was a teritary alcohol , and C was an aldehyde which is changed to primary...
  3. Aymen Ezazi

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_11.pdf questions 9 and 14 plzzz....
  4. Aymen Ezazi

    Physics: Post your doubts here!

    is the answer B??
  5. Aymen Ezazi

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s12_qp_11.pdf plz help me with these... 8, 12 , 13 , 15 , 17 , 18 ,24
  6. Aymen Ezazi

    AS Physics P1 MCQs Preparation Thread.

    wat is (P) and (Q)
  7. Aymen Ezazi

    AS Physics P1 MCQs Preparation Thread.

    i need help with q 18 plz http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_11.pdf
  8. Aymen Ezazi

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w10_qp_11.pdf Q5 plzz thanku
  9. Aymen Ezazi

    Chemistry: Post your doubts here!

    bcoz the only electronegative atom in this molecule is O, so Na can bond only to oxygen and no other atom..
  10. Aymen Ezazi

    Chemistry: Post your doubts here!

    the bond will be broken from CO2 thats where the Na from NaOH will bond to oxygen.. it will not be 3 bcoz they have taken out the alkene completely so its wrong.. 2 is correct bcoz Na is bonded to O and the rest of the molecule is ok.. so definetly its going to be 1 also.. bcoz there is no...
  11. Aymen Ezazi

    Chemistry: Post your doubts here!

    yes it can be..
  12. Aymen Ezazi

    Chemistry: Post your doubts here!

    density = mass/ volume , so mass will be density multiply by volume.. and volume was in cm^3 so convert it to dm3... but if u dont want to, anyways u'll have to divide it by 1000 to change grams into kilograms..
  13. Aymen Ezazi

    Chemistry: Post your doubts here!

    Mass of ice= d*v, 1.00*1*10^-3 = 1*10^-3 g Number of moles of ice = m /Mr , 1*10^-3/18 = 5.6*10^-3 mol use pv=nRT , V=nRT/p = 5.6*10^-3 * 8.31 * 596/ 101*10^-3 = 2.7*10^-6 * 10^6 =2.7dm^3
  14. Aymen Ezazi

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s09_qp_1.pdf help needed with these questions.. 17 , 19 , 20 , 28 , 29 , 38 ..
  15. Aymen Ezazi

    Chemistry: Post your doubts here!

    to form 1 it would have to be CL2 and if it would form 1 thn Na and Br2 would remain which i dont think would be the correct answer.. 2 can be formed bcoz the 2nd Br joins to Na..
  16. Aymen Ezazi

    Chemistry: Post your doubts here!

    in Q2 there is 50 cm^3 of cs2 not 30.. thn how will we do it?? and in q 30 why did we multiply 0.5 into 30??
  17. Aymen Ezazi

    Chemistry: Post your doubts here!

    Nov 2005-- only one bcoz any molecule can contain isotopes so only radius will be the same in all isotopes and nucleon no: and relative isotopic mass will be different.. Oct 2003-- Q23 , its not A bcoz bromine would not react with this alkane bcoz it is saturated.. not B bcoz Cl would...
  18. Aymen Ezazi

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w08_qp_1.pdf 2 , 11 , 30 , 39 plzz..
  19. Aymen Ezazi

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s08_qp_1.pdf guys , i need help with Q2 and 27.. thnx a lot !!!!
  20. Aymen Ezazi

    thank you so much :)

    thank you so much :)
Top