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  1. H

    Chemistry: Post your doubts here!

    Suggest two properties of its atoms that could explain why magnesium is less dense than iron.? ms says smaller Ar [1] larger (atomic/ionic) radius/size well i guess its more appropriate to say larger ionic radius cos in metal te individual atoms exist as ions .....wat do u say...
  2. H

    Chemistry: Post your doubts here!

    http://en.wikipedia.org/wiki/Ionic_liquid
  3. H

    Chemistry: Post your doubts here!

    well this is a definition of lattice energy the energy change when 1 mole of (ionic) solid/crystals is formed from its gaseous ions. er mentions candidates lost mark for not specifying that a solid was formed......is it necessaryy......cant l.e be used for ionic liquids
  4. H

    Chemistry: Post your doubts here!

    reply urgent for 2nd prt.....i guess there is insufficient info .......cos how will i know the mass of co2 lost
  5. H

    A2 Biology | Post your doubts here

    cn u explain effects of gm crops like one markscme says.....reduction in biodiversity.....development of superweeds....cn u explain reasons for this. http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s09_qp_4.pdf q 6 c i
  6. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s10_qp_42.pdf q8 part a ii last ms point no ill effect on gm organism.... what he means here that bacteria will not get affected due to flourescent protiesn??
  7. H

    Chemistry: Post your doubts here!

    no now its okay..........well this hydrolysis occur via SN2 SIMILAR mechanism ryt....that why we need empty orbitals for transition state to form???
  8. H

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_41.pdf q6 b ii http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_41.pdf q8 b ii in this question....for any reaction to be...
  9. H

    Chemistry: Post your doubts here!

    well @smz imran when 4 cl will be bonded to carbon......its p orbital will be filled as opposed to when 3Cl will be bonded toB....its p orbital will still have space to accomodate a lone pair of electrons i dint thought abt the bonded situation and got confused
  10. H

    Chemistry: Post your doubts here!

    hmm that seems to be a reasonable explanation...thanks
  11. H

    Chemistry: Post your doubts here!

    yar lekin 2p orbital is still vacant......so like BCl3 why cant CCl4 react...
  12. H

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s10_qp_42.pdf q3 c (i) carbon aslo has an empty 2p orbital so why it cant react
  13. H

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_42.pdf q3 c (i) carbon aslo has an empty 2p orbital so why it cant react
  14. H

    A2 Physics | Post your doubts here

    waht shud be the minimum sampling frequency to recover all the important features of the signal in pic
  15. H

    A2 Physics | Post your doubts here

    well a general question....whats the recommended technique when asked to find area under curve
  16. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_qp_52.pdf q1. part d i dint get the 2nd 6th and 12th point of ms......why we want to concentrate extract....whhat wud hapeen if i do not cover the container.....and why we need same mass.....cos...
  17. H

    A2 Biology | Post your doubts here

    post A2 biology doubts, usefull facts both in paper 4 and 5......and for god sake ...make it sticky.....i cnt bear the pain of ifinding a2 posts in that combo thread
  18. H

    A level Biology: Post your doubts here!

    well....pleaseeee some on emake a thread for A2 BIOOO..........PLEASEEEEE.....I MEAN A STICKY THREAD....ITS A REAL MESS HERE.......
  19. H

    A level Biology: Post your doubts here!

    u shud say crossing over in prophase 1 because most ov markschemes say prophase 1 apart from one duffer examiner who said metaphase 1
  20. H

    Chemistry: Post your doubts here!

    BROTHER.....i thought like this that if it was it must be positive delta H so that it is unstable and is converted further to products...........if it is already -ve delta H then it ll be already stable....well bond breaking explanation cn not be used in all situation ....it works perfectly well...
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