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  1. G

    Chemistry: Post your doubts here!

    ill chip in, hydrogen bonds are only formed when H is attached to F, O or N, otherwise if there is a bond with electronegativity difference (usually an atom attached to F, O, N, Cl, or Br) then the intermolecular forces will be permanent dipole-dipole interactions. So in a carbonyl group the...
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    Chemistry: Post your doubts here!

    http://www.freeexampapers.com/download.php?l=A%20Level/Chemistry/CIE/2002%20Jun/9701_s02_qp_1.pdf&t1=30q1nf6&t2=349iacp6 can anyone please explain Q6! thank youu
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    Chemistry: Post your doubts here!

    It says that one side chain is converted to a compound with 2 double bonds instead of 3, which means one bond was hydrogenated, so one mole of H2 was used. Then it says that 2 chains were converted to compounds with only one double bond each, which means that 2 bonds were hydrogenated per chain...
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    Chemistry: Post your doubts here!

    Q9) theres kind of a shorcut explanaion to this, since the products of reaction two are 1/2 moles, so its going to be anything with a power of 1/2 which is actually square root, the only option with an underroot 2 is A. Q18) the solid nitrate is NH4NO3 > N2H4O3 Q27) propanal and propan-2-ol...
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    Chemistry: Post your doubts here!

    can anyone please post a link for the paper 1s' of 2001 and 2002 both june and november! thanx! needed in emergency!!
  6. G

    Chemistry: Post your doubts here!

    can anyone please post a link for the paper 1s' of 2001 and 2002 both june and november! thanx! even if uv got any...just link it :P
  7. G

    Chemistry: Post your doubts here!

    histephenson007 already answered 3 and 26 so ill chip in to the 16. If something is being precipitated then it must be insoluble, of all the options CaCO3 is the only insoluble salt, or at least thats what i think.
  8. G

    Chemistry: Post your doubts here!

    its colorless :)
  9. G

    Chemistry: Post your doubts here!

    Q1. From the table X is a substance with the mp less than zero and bp more than zero so its a liquid >> the options fr X are I2 and Br2. Iodine is a solid at rtp and Br2 is liquid so is Br2. Then Y and Z both have mpoints and bps above 0 so they are solids, BUT they have low densities >> from...
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    Chemistry: Post your doubts here!

    According to the Le Chateilier's (dunno how to spell it :p), so according to the principle if any change in the factors which affect the equilibrium is altered than the reaction behaves in a way which opposes the change and tries to attain eq. Sooo if you add excess O2 the concentration of the...
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    COMPLETE 9702 PHYSICS NOTES ALL TOPICS

    thanks a bunch!
  12. G

    Any tips for literature exam??

    what do examiners wanna see in answers. or any other tips you have. be selfless and post :P thanks a bunch!
  13. G

    Chemistry: Post your doubts here!

    Can someone explain Q14 and 16? http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_1.pdf thank you :)
  14. G

    Chemistry: Post your doubts here!

    an addition to what Amy Bloom has said. Draw the compound identify the no. of bond pairs and lone pairs on the central atom of your bond. If: 4 bond pairs only: 109.5 >tetrahedral 3 bond pairs and 1 lone pair: 107 > triangular pyramidal 2 bond pairs and 2 lone pairs: 104.5 >V-shape 3 bond pairs...
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    Chemistry: Post your doubts here!

    can someone pleeease explain why Q34 is B?? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w02_qp_1.pdf
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    Chemistry: Post your doubts here!

    cheated of wikipedia but these are quite a few uses : The effects of agricultural lime on soil are: it increases the pH of acidic soil (the higher the pH the less acidic the soil); in other words, soil acidity is reduced and alkalinity increased it provides a source of calcium and magnesium...
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    Chemistry: Post your doubts here!

    inorder to form a H-I bond lesser energy is required since the bond energy is low and so the enthalpy of formation is high, and the H-Cl bond requires a higher value of energy since it has a greater bond energy value so the enthalpy of formation is low. so it basically depends on the bond energy...
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    Chemistry: Post your doubts here!

    oops ddnt see but thnx :) but for ideal gases the graph of volume and 1/pressure is directly proportional, hence a straight line....so if you want to make that a volume and pressure graph its going to be a straight line but with a negative gradient. so A seems right too :s
  19. G

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s08_qp_1.pdf Q8!! i dunno...both A an D seem right. any help?? thnx in advance :)
  20. G

    Chemistry Paper 1, 2 or 3! Any tips???

    Apparently there is very less time in the may/june as exams. and pathetically im appearing for them :P so any tips on chemistry papers....multiple choice or for any paper if you have. any feedback would be appreciated...common ya people out there help us poor souls!!
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