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  1. H

    Chemistry P4| A2 only

    u mean temp of water in which i ll be dissolving the solid....hmm got it cos in hot solution solubility will be different compared to that in cold ....so we must be dissolving both solids in the solution at same temperatire ryt? and why we acidify feso4 when titraating it with mno4....is it to...
  2. H

    Chemistry P4| A2 only

    smzimran m asking abt assumption part in next part of question
  3. H

    Chemistry P4| A2 only

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_42.pdf see question 2 part b ii.....now thats relating to gibbs free energy equation.....and we are not supposed to knw that stuff...
  4. H

    Chemistry P4| A2 only

    well smzimran.....whenever asked what is order of rxn ms always says power to which concentration of reactant is raised to in the rate quation.....isnt it order w.r.t to particular reactant....i find this definition inappropriate
  5. H

    Chemistry P4| A2 only

    well the molecule of PEG denies ms point that there must be two different functional groups present for condensation polymerization to occur ......isnt it? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_41.pdf q10...
  6. H

    Chemistry P4| A2 only

    well i learnt its planar cos for sideways p-p overalp....it cn only occur if its planar.....
  7. H

    Chemistry P4| A2 only

    bt how??? wel i have a cnfusion.......whenver we do an electrophilic substitution ......only hyddrogen gets substituted.......is there any possibilty that one of the substituents like chlorine myt also get substituted?
  8. H

    Chemistry P4| A2 only

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_41.pdf q5 part v how does more oh- reduce cell ressistance.....current is flowing thrrough the wires....i dont get the idea behind this point
  9. H

    Chemistry P4| A2 only

  10. H

    Chemistry P4| A2 only

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_41.pdf how can 1 anser question 1 last part if he has not seen the structure beforeeee http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry...
  11. H

    Chemistry P4| A2 only

    thats easy,,,,,see takin g reaction 1 asn reference.....i doubled methanol so rate will get doubled.....and i increaesed H+ BY FOUR TIMES SO RATE WIL INCREASE 4 TIMES .....OVERALL RATE INCREASES 2*4 TIME THAT IS 8 TIMES w.r.t to rxn 1 rate....so neew rate is 8.00
  12. H

    Chemistry P4| A2 only

    for triiodomethane test carboxylic acid methy ketone is not counted....does any one has any idea why?. myt find useful
  13. H

    Chemistry P4| A2 only

    check http://www.chemguide.co.uk
  14. H

    Chemistry P4| A2 only

    Briefly explain why the benzene molecule is planar? Briefly explain why all the carbon-carbon bonds in benzene are the same length? why is length of carbon-carbon bond in benzene different from simple carbon-carbon sigma bond?+ one cnfusion....according to kekule structure ....benzene wud still...
  15. H

    Chemistry P4| A2 only

    paper chromatography.....relies on partition...in which the substance is partitioned between water trapped b/w cellulose fibres and the mobile solvent...... TLC uses adsorption mechanism....it is usually a kind of tile .....whose surface has lots of OHs sticking out from the silica compound it...
  16. H

    Chemistry Alevel Grade

    yea 100% sure
  17. H

    Chemistry Alevel Grade

    MA FRIEND GOT B IN PPAPER 5 AND D IN PAPER 3 and still got A STAR.SOOOO DOUN WORRY
  18. H

    Chemistry Alevel Grade

    a or B
  19. H

    Chemistry: Post your doubts here!

    why we acidifiy solution containig fe 2+ ....when trying to dtermine its conc.
  20. H

    Chemistry: Post your doubts here!

    it shud not be molecular ion i guess....thats inappropriate word
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