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  1. S

    Chemistry: Post your doubts here!

    CH2=CHCO2H , this is the answer from the markscheme. It has no OH group present. :/
  2. S

    Chemistry: Post your doubts here!

    I need more help! :/ For (a) (ii) I just wanted to confirm that we know it's carboxylic because CO2 is given out and there'll be effervescence? Can someone please explain part (b) to me? Here's the mark scheme. http://freeexampapers.com/A-Level/Chemistry/CIE/2012-Jun/9701_s12_ms_23.pdf
  3. S

    AS Level Biology; post your doubts!!

    THANK YOU!!!!!!
  4. S

    Chemistry: Post your doubts here!

    Guys please help!! I don't understand how to answer the questions (c) (iii), d(i), d(ii) . How does the reaction show that it's a carboxylic acid? How do we identify it as ethanoic acid? I've attached the mark scheme as well...
  5. S

    Chemistry: Post your doubts here!

    Thanks!!
  6. S

    AS Level Biology; post your doubts!!

    Can someone PLEASE, PLEASE explain this multiple choice question to me! The correct answer is D.
  7. S

    Chemistry: Post your doubts here!

    Balancing the equation!
  8. S

    Chemistry: Post your doubts here!

    HELPPP! I NEED HELPPPP! #DesperationAtItsPeak
  9. S

    Chemistry: Post your doubts here!

    Could someone explain this equation? The commonest form of iron(II) sulfate is the heptahydrate, FeSO4.7H2O. On heating at 90 C this loses some of its water of crystallisation to form a different hydrated form of iron(II) sulfate, FeSO4.xH2O. 3.40g of FeSO4.xH2O was dissolved in water to form...
  10. S

    Chemistry: Post your doubts here!

    Thank you so much guys for your help! :)
  11. S

    Chemistry: Post your doubts here!

    Question 1 (c) i! Another hydrocarbon, W, with the formula C4H8, reacts with hydrogen bromide, HBr, to give two products X and Y. X and Y are structural isomers of molecular formula C4H9Br. Reaction of X with aqueous alkali produces an alcohol, Z, that has no reaction with acidifi ed...
  12. S

    Chemistry: Post your doubts here!

    Thanks so much for this. I don't get one thing though, how can you tell the mole ratios in the (iv) part? By comparing the NH4+ ions to what in which equation? (I know I may come across as stupid but moles and organic are my weakness :'( )
  13. S

    Chemistry: Post your doubts here!

    GUYS PLEASE HELP!!!!!! Question 2 (b) May june 2014/23 I am struggling with this and my exams start in less than 10 days! :'( http://maxpapers.com/wp-content/uploads/2012/11/9701_s14_qp_23.pdf
  14. S

    Chemistry: Post your doubts here!

    O Thank you so much! You have no idea how grateful I am to you for solving this step by step! THANK YOU!!!!
  15. S

    Chemistry: Post your doubts here!

    Guys, I am struggling with this question!!!! :'( It's May June 2014, 23 Question 1 (b) (v) (v) Deduce the values of x, y and z in the equation in (iv) PLEASE HELP!!!http://maxpapers.com/wp-content/uploads/2012/11/9701_s14_qp_23.pdf
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