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  1. B

    Chemistry help

    Please explain how to solve MCQ# 16 in this paper: http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_11.pdf
  2. B

    Physics help

    Please solve the question in the attachment and also explain it.
  3. B

    bromoethane

    Bromoethane can be prepared from ethane by the substitution of hydrogen by bromine. What are the two main problems with using this method?
  4. B

    Bromoethane

    Bromoethane can be prepared from ethane by the substitution of hydrogen by bromine. What are the two main problems with using this method?
  5. B

    Aluminium compounds

    yes it is the general rule, but lithium, beryllium and aluminium do not always form ionic compounds, as their atomic size is very small. so the ionization energy becomes really high. instead they form covalent compounds.
  6. B

    Aluminium compounds

    Although aluminium is a metal, it forms covalent compounds. However I discovered that Al2O3 and AlF3 are ionic compounds. Why is this so and are there any other aluminium compounds that are ionic?
  7. B

    Chemistry help!

    thanks!! :)
  8. B

    Chemistry help!

    Plz answer this question: ?The relative atomic mass of an element is the weighted average atomic mass of the element relative to 1/12th the mass of an atom of the 12C isotope. What doe the word 'weighted' mean in the definition?
  9. B

    Rechecking of paper

    What is the last date of applying for rechecking of the papers? And what is the procedure of having it done?
  10. B

    The conflict in P1 Maths?

    oh yeah i forgot the question!! it did mention quadrilateral. so yes triangle was wrong. btw i drew a trapezium! :p
  11. B

    The conflict in P1 Maths?

    it cud hv been an isosceles triangle as well
  12. B

    Maths, Addmaths and Statistics: Post your doubts here!

    we will use the perimeter formula. since it is a sector, we will form an equation like this: 2π(12) x (60/360) = nπ now we can solve this equation
  13. B

    How was your Maths paper ?

    anyone discussing abt the paper in conversation... do add me!!
  14. B

    Maths, Addmaths and Statistics: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20O%20Level/Mathematics%20D%20(Calculator%20Version)%20(4024)/4024_s04_qp_1.pdf Plz explain Q22 part b
  15. B

    how to unfollow a thread?

    thanks!
  16. B

    how to unfollow a thread?

    how do we unfollow a thread we have posted in?
  17. B

    Maths, Addmaths and Statistics: Post your doubts here!

    how do we integrate separately?
  18. B

    Maths, Addmaths and Statistics: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20O%20Level/Mathematics%20-%20Additional%20(4037)/4037_w11_qp_12.pdf How will we do Q9 part2?
  19. B

    Best faculty?

    hmm... but i live in lahore!!
  20. B

    physics paper 1,2 ........can we discuus da papper nw?

    i thought u were talking abt the mcq. well i didn't attempt Q9 so didnt know abt this one!
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