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  1. iKhaled

    How was the AS chemistry practical 31 ?

    if i am not mistaken. this is a chemistry practical thread and NOT an physics thread :P:P
  2. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    i would appreciate it if someone can get classified notes on the section of "role of sodium and potassium" int he body this is obviously chemistry btw not physics :P
  3. iKhaled

    Chemistry: Post your doubts here!

    i am mistaken above in the part of the first 2 equations. if u used equation one and 2 a reaction will take place too and u will get a nitrogen containing product..but u can't take equation 2 and 3 since the nitrogen product will cancel each other and also the value of their electrode potential...
  4. iKhaled

    Chemistry: Post your doubts here!

    see in order for a reaction to occur the difference between the electrode potential of the two should be higher than 0.30v..if the value of the difference is below 0.3 a reaction may or may not occur but it will be impossible to notice so better to take the lowest one and the highest one. if we...
  5. iKhaled

    Chemistry Paper 4-theory- doubts =D

    hehe its okii ;)
  6. iKhaled

    Chemistry Paper 4-theory- doubts =D

    thats my Ksp where is the mistake? :o
  7. iKhaled

    Chemistry Paper 4-theory- doubts =D

    hey and no u r mistaken the equation is pbcl2 --> pb^2+ + 2cl^- the ksp = [pb^2+][Cl-]^2 now u see when pbcl2 dissolves u will have x concentration of pb^2+ AND 2x of cl^-1 not x too because the ratio is 1:2 so ksp = x(2x)^2 ksp = 4x^3 i hope u got it!
  8. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    pls pray for me i get great results :)
  9. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    its a formula we use to find out the constant (k) which we find in the rate equation..i dont think we must memorize this formula
  10. iKhaled

    Chemistry: Post your doubts here!

    is there an equation given ?
  11. iKhaled

    Mathematics: Post your doubts here!

    post a link
  12. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    we would all die without internet
  13. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    anyone knows how to calculate the percentage uncertainty? is there a formula or somethin ?
  14. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    i am awake (not paki) but i dont know if we should or not :/
  15. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    *gets my popcorn and watches this *..damn it u too u r wasting my study time :P
  16. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    so hydrogen bonds don't have van der waal forces in them too ? because i thought all of them has van der waal too
  17. iKhaled

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    guys i have a random question.. do all permanent dipole-dipole compounds and hydrogen bonds compounds have also van der waal forces ?
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