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Recent content by Jiyad Ahsan

  1. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Alice there were the other ways as well :D :p and you dnt have to say i did it :p i aint gonna sue you!
  2. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Q5 the answer is D, since when the difference between molecules of a liquid and a gas is the forces holding the liquid molecules together so, in this case hydrogen bonding so just vaporize a mole of liquid hydrogen halide and note down the energy change that would also be an indicator to the...
  3. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Q4.. add all the electrons.. 3 x 8 from oxygen 6 from carbon 1 from hydrogen 1 because its an anion (negatively charged.. so must have an excess electrons, and since it requires 2 anions to react with Ca its must be -1) adding up we have 32, so answer is C
  4. Jiyad Ahsan

    Chemistry: Post your doubts here!

    umm its not an option.. i asked my teacher the samething, he said that we have to think of the acid as a limiting agent..
  5. Jiyad Ahsan

    Chemistry: Post your doubts here!

    96 kg hydrogen is left means (120 - 96) = 24 kg was used up The equation: 3H2 + N2 --> 2NH3 (3 x 2) = 6 kg hydrogen produces (2 x 17) = 34 kg ammonia 1 kg hydrogen would produce (34/6) kg ammonia 24 kg hydrogen would produce = (34 / 6) x 24 = 136 kg ammonia That is why answer is C
  6. Jiyad Ahsan

    Chemistry: Post your doubts here!

    the Cl and the O cancel each others effects somewhat as they both are quite electronegative.. in option C, while in option B the O side becomes electronegative quite easily, no resistance from the CH4 to become electro-positive whatsoever the correct link.. papers.xtremepapers.com/CIE/Cambridge...
  7. Jiyad Ahsan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_13.pdf Q5, combustion is exothermic right? C-H = 410 C -(triple-bond)- C = 840 O-H = 460 C=O = 740 O=O = 496 acha g, now all you have to is put all the exothermic things one side minus the...
  8. Jiyad Ahsan

    Physics: Post your doubts here!

    yar its A, because, the distance between the charges does not change, so the work-done in moving the charge away or closer to each other is 0 :p remember.. work is only done when the distance 'between' the charges is changed
  9. Jiyad Ahsan

    Physics: Post your doubts here!

    no prob man ! give me more things to solve, questions, queries.. i'm bored :p
  10. Jiyad Ahsan

    Physics: Post your doubts here!

    viscosity relates somewhat to the fluidity of a fluid (in our case, liquids).. it sort of describes a fluids resistance to flow for example Oil is a more viscous fluid (compared to water), it flows slowly and when you take Oil in a bottle, put an object on its surface and it will move down quite...
  11. Jiyad Ahsan

    Chemistry: Post your doubts here!

    no prob :p and thnx best of luck to you too :)
  12. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Okay thing about Q 26 is you have to form reaction intermediates right? i'm going to focus on why B (W and Y) is the correct answer. W = CH3CH2CH3 Y = CH3CH=CH2 with W you react it with Br2 and you get a bromo-alkane with 3 carbons, same as when you react Y with HBr you get the same...
  13. Jiyad Ahsan

    Chemistry: Post your doubts here!

    im on it :)
  14. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Q39 ok here goes you see the 3 options given right? look closely at the 3rd option.. umm just open the file attached, it should make sense.. if it doesnt :p all you have to do is ask :p
  15. Jiyad Ahsan

    Chemistry: Post your doubts here!

    Q 30! okay here goes, so you know when we find the yield in an ester rxn we use the acid right? so the mass of the ethanoic acid given is 30, which divided by the mr of the acid 30/60 = 0.5 moles and in the end the ester formed has mass 22g while its mr is 88, moles of ester formed, 22/88 = 0.25...
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