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  1. drowning-in-studies

    Chemistry: Post your doubts here!

    idk...I guess the threshold will be high?
  2. drowning-in-studies

    Chemistry: Post your doubts here!

    Yeah I did
  3. drowning-in-studies

    Chemistry: Post your doubts here!

    mhmm.. okay then :)
  4. drowning-in-studies

    Chemistry: Post your doubts here!

    39 Okay, got that :) 40 Yeah okay...but I don't get the 3rd molecule ? ANd hey Q 40 is in the examiner report's particularly difficult :p
  5. drowning-in-studies

    Chemistry: Post your doubts here!

    Q 39 and Q 40??
  6. drowning-in-studies

    Chemistry: Post your doubts here!

    Im really sorry:unsure:... I just realised I've asked this question before and that you replied:oops: 16 days and i forgot:notworthy: But thank you loads for being so helpful
  7. drowning-in-studies

    Chemistry: Post your doubts here!

    6 The standard enthalpy change for the reaction 2NF3(g) → 2N(g) + 6F(g) is ΔH o = +1668 kJ What is the bond energy of the N–F bond? A –556 kJ mol–1 B –278 kJ mol–1 C +278 kJ mol–1 D +556 kJ mol–1 Ans is C...How??
  8. drowning-in-studies

    Chemistry: Post your doubts here!

    OOHH! Thanks :LOL:
  9. drowning-in-studies

    Chemistry: Post your doubts here!

    I keep getting D??
  10. drowning-in-studies

    Chemistry: Post your doubts here!

    26 High-energy radiation in the stratosphere produces free-radicals from chlorofluoroalkanes, commonly known as CFCs. Which free-radical is most likely to result from the irradiation of CHFCl CF2Cl ? A CHFClC*FCl B *CHClCF2Cl C *CHFCF2Cl D *CFClCF2Cl Ans is C. I don't understand the theory...
  11. drowning-in-studies

    Chemistry: Post your doubts here!

    6 A white powder is known to be a mixture of magnesium oxide and aluminium oxide. 100 cm3 of 2 mol dm–3 NaOH(aq) is just sufficient to cause the aluminium oxide in x grams of the mixture to dissolve. The reaction occurring is Al 2O3 + 2OH– + 3H2O → 2Al (OH)4- 800 cm3 of 2 mol dm–3 HCl (aq) is...
  12. drowning-in-studies

    Chemistry: Post your doubts here!

    24 Oct-1-ene, CH3(CH2)5CH=CH2, is subjected to thermal cracking. Which combination of compounds W, X, Y and Z can be obtained? CH2=CH2 CH3CH=CH2 CH3CH2CH3 CH2=CHCH=CH2 W X Y Z A W, X, Y and Z B W, X...
  13. drowning-in-studies

    Chemistry: Post your doubts here!

    10.When solid ammonium chloride dissociates at a certain temperature in a 0.500 dm3 container, ammonia and hydrogen chloride are formed. NH4Cl (s) NH3(g) + HCl (g) The initial amount of ammonium chloride was 1.00 mol, and when the system had reached equilibrium there was 0.300 mol of ammonium...
  14. drowning-in-studies

    Chemistry: Post your doubts here!

    Now its easy :p
  15. drowning-in-studies

    Chemistry: Post your doubts here!

    Ohh... That's it? :D I did the bonds broken-bonds formed
  16. drowning-in-studies

    Chemistry: Post your doubts here!

    The standard enthalpy change for the reaction 2NF3(g) → 2N(g) + 6F(g) is ∆Ho = +1668kJ What is the bond energy of the N–F bond? A –556kJ mol–1 B –278kJ mol–1 C +278kJ mol–1 D +556kJ mol–1 Ans is C...but im getting D -_-
  17. drowning-in-studies

    Chemistry: Post your doubts here!

    5 Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ∆Ho = –214kJ mol–1 I2(s) → I2(g) ∆Ho = +38kJ mol–1 What is the standard enthalpy change of formation of iodine trichloride, ICl3(s)? A +176kJ...
  18. drowning-in-studies

    Chemistry: Post your doubts here!

    It is A. But how did you get that?
  19. drowning-in-studies

    Chemistry: Post your doubts here!

    9 When a sample of HI is warmed to a particular temperature the equilibrium below is established. 2HI(g) H2(g) + I2(g) At this temperature, it is found that the partial pressure of HI(g) is 28 times the partial pressure of H2(g). What is the value of Kp at this temperature? A 1.28 × 10–3 B...
  20. drowning-in-studies

    Chemistry: Post your doubts here!

    But how do you decide when to add and subtract? Is it in reference to where the arrows are pointing? What am i missing out? :ROFLMAO::D like, -75+92 or -75-92?
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