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  1. The Sarcastic Retard

    Chemistry: Post your doubts here!

    1000 + 200
  2. The Sarcastic Retard

    Chemistry: Post your doubts here!

    Na reacts with both alcohols and acids as well. So 4 moles of Na is there. We know hydrogen molecule exist as H2 so 2 moles of H2 needed to balance the reaction.
  3. The Sarcastic Retard

    Chemistry: Post your doubts here!

    Initial Moles = IM and eq mole = EM IM of N2 = 2 mol IM of H2 = 6 mol IM of NH3 = 2.4 mol EM of N2 = 2.32 We have eqantion, N2 + 3H2 <====> 2NH3 So, EM of H2 is 6 - 3(x) EM of NH3 is 2.4 + 2(x) we know x is -0.32 Keep in those equation : EM of H2 = 6.96mol EM of NH3 = 1.76mol molar...
  4. The Sarcastic Retard

    Chemistry: Post your doubts here!

    To balance the number of electron, you need to multiply second equation with 2. So 2I will be there and hence electrons will be canceled out.. :) LEaving us with the ratio of 1 : 2
  5. The Sarcastic Retard

    Chemistry: Post your doubts here!

    2) Use of N from NPK will be 15/60 Moles of N = (15/60)/14 Concentration of N in fertilizer : (15/60)/(14*5) = 0.03 15) CaCO3 --------> CaO + CO2 Mr of CaCO3 = 100.1 Total mass of CaCO3 = 1200g n of CaCO3 used in total = 1200/100.1 = 11.9 1 : 1 ratio of CaCO3 and CO2 Mr of CO2 = 44 m of...
  6. The Sarcastic Retard

    Chemistry: Post your doubts here!

    https://www.xtremepapers.com/community/threads/last-minute-preparation-on-mcqs-9701-and-9702-discussion-here.42450/page-4#post-941877
  7. The Sarcastic Retard

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    I know the answer so directly doing it. We know mass of gas that is O2 plus a metal oxide, so finding moles of them and add their masses would be a longer procedure so we do like, 3 - 1.53 = 1.47g of solid left. So as answer is D : moles of Sr(NO3)2 = 3/(211.6) = 0.014 mol 1 mole of it gives...
  8. The Sarcastic Retard

    BASIC CONCEPTS ON GRAPH! PHYSICS As LEVEL!!

    This guy is so good! ^_^ There are total of 11 videos.. :) Go to his channel you will get it.. :)
  9. The Sarcastic Retard

    Thanks. (Y)

    Thanks. (Y)
  10. The Sarcastic Retard

    some E-books here for O and A levels

    Wonderful. Thanks a lot sis. :) ^_^
  11. The Sarcastic Retard

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    I was not sure of this as I was never been taught a thing like this in ma classes and my teacher says its part of A2. :) Though go to youtube, type "9701 chemistry June 2015 , Paper 1_2" And search your question in the playlist. Its of meta tutor.. :) Like now I know it, but all credit goes to...
  12. The Sarcastic Retard

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    carbonates reacts with acid to give CO2 leaving the acid salt of the original carbonate salt.
  13. The Sarcastic Retard

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    Here you go.. ^_^
  14. The Sarcastic Retard

    some E-books here for O and A levels

    Thanks. (y)
  15. The Sarcastic Retard

    Mathematics: Post your doubts here!

    From your this expression : (Ax)^2 - 2ABx + B^2 + C, clearly A = 3. If u took A as -3 then 36/(2 x -3) = -6 and that will make the opposite sign of what we need that is +ve sign and we need -ve. If u take A = 3 then, B = 6. So its correct now. :) (y) More over as its squared, hence f(x) >= 16 :)
  16. The Sarcastic Retard

    Good luck. :)

    Good luck. :)
  17. The Sarcastic Retard

    Mathematics: Post your doubts here!

    SHow me your paper, and Temme which paper it is.. :) According to me they are talking about range. :)
  18. The Sarcastic Retard

    No MIT?

    No MIT?
  19. The Sarcastic Retard

    Mathematics: Post your doubts here!

    9(x^2 - 4x + 52/9)] 9[(x - 2)^2 + 16/9)] 9(x - 2)^2 + 16 3^2 (x - 2)^2 + 16 (3x - 6)^2 + 16 --> 16
  20. The Sarcastic Retard

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    P : Bond breaking is endothermic, from data, Br - Br Bond breaking energy is +193kj/mol Q : Bond forming is exothermic, from data, Cl2 bond forming energy is -244kj/mol R : Its exothermic as CH3Cl is formed, from data, CH3Cl bond forming energy is - [(410*3) + (340)] = -1570kj/mol S : Breaking...
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