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Recent content by ahmed abdulla

  1. ahmed abdulla

    Chemistry: Post your doubts here!

    Cr2O7 2– + 14H+ + 6e– → 2Cr3+ + 7H2O----Eo = 1.33 V Cl2 + 2e– → 2 Cl– ---------------------------- Eo = 1.36 V overall ionic equation: Cr2O7 2– + 6Cl– + 14H+ → 2Cr3+ + 3Cl2 + 7H2O But shouldn't one with more negative E0 value be reversed? This is from w07
  2. ahmed abdulla

    Mathematics: Post your doubts here!

    Sorry for that . Good luck again .
  3. ahmed abdulla

    Mathematics: Post your doubts here!

    Good luck bro , btw , is it the cie exam or Mock exams .
  4. ahmed abdulla

    Mathematics: Post your doubts here!

    You might have not seen the other one :P The one to draw Re z=1 Thanks
  5. ahmed abdulla

    Mathematics: Post your doubts here!

    Can someone have a look at my doubt? https://www.xtremepapers.com/community/threads/mathematics-post-your-doubts-here.9599/page-597#post-760905
  6. ahmed abdulla

    *Biology Paper 5 tips*

    I have gone through Mj 2009 and Ms said : temperature and suitable method e.g. temperature controlled room; do not allow water bath
  7. ahmed abdulla

    *Biology Paper 5 tips*

    When we use waterbath Or room temp. Sometimes for temp they use waterbath & sometimes room temp.
  8. ahmed abdulla

    Mathematics: Post your doubts here!

    Have a doubt in 2012 paper, easy question , but dont seem to get it ! Question 5 (ii) .. ( 2 Marks ) For last question , how to draw Re z > 1 ? ( 1 Mark )
  9. ahmed abdulla

    Chemistry: Post your doubts here!

    Your answers are all right , Thanks
  10. ahmed abdulla

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_53.pdf Question 2b(v) whats the conclusion Question 3d & e
  11. ahmed abdulla

    Chemistry: Post your doubts here!

    Thanks abbby . :) second question , i cant still reach a conclusion as which is the right equation for decomposition and for the table , if you look at row 5 , you will find Both volume and mass of water not given so how to use the ratio when both not given? and row 9 has both volume of...
  12. ahmed abdulla

    Chemistry: Post your doubts here!

    Posting this for more than once :D Paper 5 , http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_53.pdf Question 2b(iii) ( moles ) Question 3 , how to Complete the table when two rows not given & Whats is the max. Volume a gas syringe can...
  13. ahmed abdulla

    Mathematics: Post your doubts here!

    You will find some of M1 topics here , so search for it :p http://www.mrbartonmaths.com/resources/a%20level%20revision/M2.pdf
  14. ahmed abdulla

    Mathematics: Post your doubts here!

    I found this site this year , i was angry i couldn't find it last year for my M1 :D http://www.mrbartonmaths.com/resources/a level revision/M1.pdf And regarding your question , i remember it came last year in my exam and i left it !! i think 95% were not able to do it ! but that doesnt mean you...
  15. ahmed abdulla

    Chemistry: Post your doubts here!

    group II metal nitrate is going to produce metal oxide and nitrogen dioxide gas,the ratio between metal nitrate and metal oxide would be 1:1 5/x+28+96 = (5-3.29)/x+16 equate it u will get the answer
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