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  1. AbbbbY

    Chemistry: Post your doubts here!

    C Mass of 1cm3 of H2O(g) = 1g Mol of H2O = 1/18 = 0.0556 1 mol occupies 24dm3 0.0556 will occupy 1.33 dm3 Volume of steam at 298K = 1.33 dm3 Volume of steam at 598K = 2.67 dm3
  2. AbbbbY

    Chemistry: Post your doubts here!

    http://www.scribd.com/doc/140353885/A-Level-Chemistry-Factsheets Page 16 of the document. Helped me a lot.
  3. AbbbbY

    Chemistry: Post your doubts here!

    D CxHy + O2 -> CO2 + H2O 0.2 mol -> 0.8 mol + 0.8 mol Ratio wise, it's 1 : 4 : 4 so we need a hydrocarbon whose 1 mole will give you 4 moles of CO2 and H2O each. Since we need 4 moles of CO2, options A and B are eliminated. Since we need 4 moles of H2O and not 2, option C is...
  4. AbbbbY

    Chemistry: Post your doubts here!

    http://i.imgur.com/G2akAHB.jpg Try zooming in to see the reactants/conditions. If they're not visible quote me or send me a VM and let me know I'll scan it and reupload. Idk if it's clear enough took a pic from my phone. Also note of the of arrows is the other way around.. Primary Alcohol ->...
  5. AbbbbY

    Chemistry: Post your doubts here!

    Since we know that conc = mol/vol, take a fixed concentration of acid, lets say 0.2mol HCl and then dilute it like this. 1st Titre -> 50 cm3 acid 0 cm3 water 2nd Titre -> 40 cm3 acid 10 cm3 water 3rd Titre -> 30 cm3 acid 20 cm3 water 4th Titre -> 20 cm3 acid 30 cm3 water 5th Titre -> 10 cm3...
  6. AbbbbY

    Chemistry: Post your doubts here!

    Are you sure it's not 0.02 mol of Al? Doesn't make sense otherwise... ___ 2Al + 3/2 O2 -> Al2O3 Al2O3 + 6HCl -> 2AlCl3 + 3H2O 0.2 mol of Al will give 0.1 mol of Al2O3. 1 mol of Al2O3 reacts completely with 6 mol of HCl 0.1 mol will react with 0.6mol of HCl. conc = mol/vol 2.00=0.6/vol...
  7. AbbbbY

    Chemistry: Post your doubts here!

    H2S + 1.5O2 -> H20 + SO2 8.65/(1+1+32) = 0.254 mols of H2S 1 mol reacts completely with 1.5 mol of O2 0.254 will thus react with 0.254*1.5=0.381 mol of O2. 1 mol of O2 occupies 24dm3 0.381 will occupy 9.15 dm3 ALTERNATE METHOD: 1 mol of H2S = 34g requires 1.5 mol of O2 = 36dm3 so; 34g =...
  8. AbbbbY

    Rose the boy. ;)

    Rose the boy. ;)
    • AbbbbY
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  9. AbbbbY

    Actually, more like think of it and....

    Actually, more like think of it and....
    • AbbbbY
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  10. AbbbbY

    Talk of the devil and he's there :P

    Talk of the devil and he's there :P
    • AbbbbY
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  11. AbbbbY

    Physics: Post your doubts here!

    You do realize that you've linked Bio papers in a Physics thread, right?
  12. AbbbbY

    Chemistry: Post your doubts here!

    There's a long and correct way and there's a shortcut way. You could use Hess's law and go through the hassle, but since it's an MCQ there has to be a shortcut. If there's anything I've learnt doing P1's over the years it's this. Break down the reactions into two parts. Firstly, CO2 -> CO...
  13. AbbbbY

    Results: CIE October/November 2013 Examination Series.

    Like I said, cover the topics (from the book) and then practice the paper questions.
  14. AbbbbY

    Results: CIE October/November 2013 Examination Series.

    DShit. All you need to know is the topics and practice the papers. That's more than enough.
  15. AbbbbY

    SAT guidence and help needed

    You literally just ignored the questions and restated your initial question. -_-
  16. AbbbbY

    Idk. Never bothered asking.

    Idk. Never bothered asking.
    • AbbbbY
    • Profile post comment
  17. AbbbbY

    Results: CIE October/November 2013 Examination Series.

    3 months? Even one is enough to do O level math from scratch if you're willing to work :/
  18. AbbbbY

    Results: CIE October/November 2013 Examination Series.

    I did like 3 past papers for p1 and p2 dude. O Level Math is baby stuff if you've a strong conceptual base. Just needed a tiny bit of luck.
  19. AbbbbY

    SAT guidence and help needed

    Depends what uni's you plan on applying to. - O/A Level grades? - Co curriculars? - Financial Stability? Will you require aid? How much in USD per year are you willing to shell out? - Any siblings in any US unis? __ Also, for Electronics, look into Canada. A lot of top uni's there and a very...
  20. AbbbbY

    Results: CIE October/November 2013 Examination Series.

    Yeah. Happened to me with my Math exam. Lost a mark in P1 and knew I had lost that mark and ended up losing only that mark. :( In Physics and Chem there's a lot, A LOT, more chance of making a mistake or two. Especially because of P1.
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