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  1. darkxangel

    Chemistry: Post your doubts here!

    i didn't quite get it :/ I get the part where Na reacts with both -CO2H and -OH but after that i don't get it .. and yes it is C.
  2. darkxangel

    Chemistry: Post your doubts here!

    How to do this ?
  3. darkxangel

    Chemistry: Post your doubts here!

    An organic compound J reacts with sodium to produce an organic ion with a charge of –3. J reacts with NaOH(aq) to produce an organic ion with a charge of –1. What could be the structural formula of J? A HO2CCH(OH)CH2CO2H B HO2CCH(OH)CH2CHO C HOCH2CH(OH)CH2CO2H D HOCH2COCH2CHO Help !
  4. darkxangel

    Chemistry: Post your doubts here!

    yes it is and thanks again :D
  5. darkxangel

    Chemistry: Post your doubts here!

    The reaction between aluminium powder and anhydrous barium nitrate is used as the propellant in some fireworks. The metal oxides and nitrogen are the only products. Which volume of nitrogen, measured under room conditions, is produced when 0.783 g of anhydrous barium nitrate reacts with an...
  6. darkxangel

    Chemistry: Post your doubts here!

    Two moles of compound P were placed in a vessel. The compound P was partly decomposed by heating. A dynamic equilibrium between chemicals P, Q and R was established. At equilibrium, x mol of R were present and the total number of moles present was (2 + x). What is the equation for this...
  7. darkxangel

    Chemistry: Post your doubts here!

    Thankkks :D :D
  8. darkxangel

    Chemistry: Post your doubts here!

    Yes, the answer is C and thankyou :D
  9. darkxangel

    Chemistry: Post your doubts here!

    Can you do it for me ?
  10. darkxangel

    Chemistry: Post your doubts here!

    Propanone has the molecular formula C3H6O. The enthalpy change of combustion of hydrogen is –286kJmol–1 . The enthalpy change of combustion of carbon is –394kJmol–1 . The enthalpy change of combustion of propanone is –1786kJmol–1 . Using this information, what is the enthalpy change of...
  11. darkxangel

    Chemistry: Post your doubts here!

    Thanks :D I got it ! :D
  12. darkxangel

    Chemistry: Post your doubts here!

    Can someone please help me with this question? Nov2011 qp 12
  13. darkxangel

    Chemistry: Post your doubts here!

    Can someone please help me with this question ?
  14. darkxangel

    AS level Chemistry and Biology Pastpapers

    Hey, does anyone know where I can find the pastpapers of AS level Chemistry and Biology from around 1996-2002 ?
  15. darkxangel

    CAREER COUNSELLING

    Hey, I'm doing my AS at the moment. The subjects am taking are Chemistry, Physics, Biology and Maths. Can you please give me some ideas on which career I could go for with the subjects I have taken?
  16. darkxangel

    how to get old past papers for chemistry

    It is there somewhere in the last few pages of the PDF of chemistry1993-2000answers.pdf
  17. darkxangel

    how to get old past papers for chemistry

    11, 12 , 13, these are the different variables which differents schools or countries choose to do although the topics are the same, the only difference is that the contents (the questions) of each variable/paper differ from each other. like for me, I did 12, 32 and 62 Sorry fo replying 2 and a...
  18. darkxangel

    Edexcel AS Physics Unit 3 <urgent>

    I am doing Self-Study for AS Physics and since I have no one to actually guide me and help me except for the internet (my thanks to who ever created the internet), I wanted to know what do we have to do in Unit 3 AS Physics. What are we supposed to do in the course work, what are we supposed to...
  19. darkxangel

    how to get old past papers for chemistry

    u can find the answers in the last few pages of this pdf. sorry for replying late. best of luck for tomorrow.
  20. darkxangel

    biology P1 (& chemistry) year 2002..

    Here
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