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  1. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    2 Carboxylic groups have mass (2*45) = 90. Therefore mass of CxHy = 132 - 90 = 42 Hence, 12x + y = 42 Apply trial and error, when x = 3, 36 + y = 42 y = 6. x cannot be greater than 4. At x = 2, y = 18. At x = 1, y = 30. Both of which are not possible. Hence, x = 3 , y = 6.
  2. Saad Mughal

    Chemistry ATP Tips

    Thanks for the info. I didn't know about dropper. :)
  3. Saad Mughal

    Chemistry ATP Tips

    I solved the papers from 2003-2008. This guess paper is mostly (almost all of it) from the past papers.
  4. Saad Mughal

    Chemistry ATP Tips

    Naming the apparatus? Just know, Titrating flask - Your normal everyday flask. To measure 25 cm^3, 50cm^3 accurately - Pipette. To measure larger volumes approximately - Measuring cylinder. To heat, stir, mix solutions - Beaker. To collect (sometimes) and measure volume of gases - Gas syringe...
  5. Saad Mughal

    https://www.xtremepapers.com/community/threads/imran-merchant-guess-papers.25359/#post-517929

    https://www.xtremepapers.com/community/threads/imran-merchant-guess-papers.25359/#post-517929
  6. Saad Mughal

    Chemistry ATP Tips

    :)
  7. Saad Mughal

    Chemistry ATP Tips

    I didn't know about iron (never read about it), so I googled it and blackish type compounds showed up. Just add the words shiny grey or shiny black, you'll get the mark(s). :)
  8. Saad Mughal

    Chemistry ATP Tips

    :p
  9. Saad Mughal

    Chemistry ATP Tips

    Sorry for the confusion. :)
  10. Saad Mughal

    Chemistry ATP Tips

    NO and CO are neutral oxides. They react with oxygen in the air to form acidic oxides. 2NO + O2 ---> 2NO2
  11. Saad Mughal

    Chemistry ATP Tips

    Yeah, I know. I corrected it. It is neutral oxide + air ---> acidic oxide.
  12. Saad Mughal

    Chemistry ATP Tips

    Actually, this is incorrect, sorry, it is Neutral Oxide + Air ---> Acidic Oxide. AhsanAfzal. Sorry for the mistakes, I wrote this in a hurry. :/
  13. Saad Mughal

    Chemistry ATP Tips

    I don't know for sure because the mark scheme does not say anything about this. It's better that you write it in decimal form because we don't know for sure!
  14. Saad Mughal

    Chemistry ATP Tips

    Curve should be drawn with a freehand.
  15. Saad Mughal

    Chemistry ATP Tips

    Thanks. :)
  16. Saad Mughal

    Chemistry ATP Tips

    We can use the word liquify. I was describing the use. I'll correct it. Thanks. :)
  17. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    You're answer is correct, it's in the markscheme, 2003 june.
  18. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Steam is well, a gas. It is water vapour, but when they ask, the reaction of sodium and iron with water, I think they mean water, not steam. :P
  19. Saad Mughal

    Chemistry ATP Tips

    :)
  20. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I was thinking of the exact same thing. Iron reacts with water (and air) to form rust (brown solid). The thing is they're only asking for the reaction with water. Iron doesn't react with water, it reacts with steam, so that's that. :)
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