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  1. Namehere

    A2 Physics P4 Questions ONLY

    Thank you!
  2. Namehere

    A2 Physics P4 Questions ONLY

    Thank you!
  3. Namehere

    A2 Physics P4 Questions ONLY

    Hi, can someone help me allocate (and explain the positions) of each nucleon please? Q8(a) Thank you very much in advance.
  4. Namehere

    Mechanics 1 P42 2014; Discussion!

    Looks we´ve got some company! Though, not sure they did as bad as me! ^^
  5. Namehere

    Chemistry: Post your doubts here!

    Couldn´t we get a more difficult paper...? Paper 4 variant 1, my goodness... Will lose minimum 10-12 marks.
  6. Namehere

    Chemistry: Post your doubts here!

    I hope its a difficult-medium paper ^^ but good luck anyway.
  7. Namehere

    Chemistry: Post your doubts here!

    I think it should be more if P2 and P4 v1 was so easy... 235/260, 230/260? ^^
  8. Namehere

    Chemistry: Post your doubts here!

    Im doing 41 too, I hope its not easy, dont like easy papers, I feel like my preparation goes to... some naasty place...
  9. Namehere

    Chemistry: Post your doubts here!

    What variant was it??
  10. Namehere

    Chemistry: Post your doubts here!

    oO, which variant did you do?
  11. Namehere

    Chemistry: Post your doubts here!

    You just assume that when you previously calculated the [Ag+], it is the same as the one you are using now. How else could you do it?
  12. Namehere

    Chemistry: Post your doubts here!

    Do not worry! You are not alone :D! Nah... just kidding, we will do fine! Usually the best chemists struggle the most, simply because they know the most!
  13. Namehere

    Chemistry: Post your doubts here!

    And they call themselves CIE... :D
  14. Namehere

    Chemistry: Post your doubts here!

    Ok, I need explanations... "the carbon–fluorine bond is even more hydrophobic than the carbon–hydrogen bond." "Fluorine has the highest electronegativity of all elements: 3.98.[1] This causes the high dipole moment of C-F bond" - Isn´t this contradictory? If the bond is polar, shouldn´t it be...
  15. Namehere

    Chemistry: Post your doubts here!

    For Ag2CO3 the solubility is just the cube root of the Ksp, nothing divided by 4, I think... For Al2O3 u take the fifth root, but they wouldn´t ask that, I think... WRONG Ag2CO3 --> 2Ag + CO3 2-, Ksp = [Ag+] [CO3 2-], let conc (solubility) of Ag2CO3 = x Therefore, (2x)^2 (x) = Ksp 4x^3 = Ksp x...
  16. Namehere

    Chemistry: Post your doubts here!

    You need to take into account the 79Br, 81Br, 35Cl and 37Cl isotopes, together with propene. If you add the Mr of propene with an isotope of Br and an isotope of Cl you get the answers.
  17. Namehere

    Mathematics: Post your doubts here!

    oh crap, was using 9.81 as g rather than 10... ok ty! :D
  18. Namehere

    Mathematics: Post your doubts here!

    From where did the fives from s = 17(t+2) - 5(t+2)^2 and s = 7t - 5t^2 come from?
  19. Namehere

    Chemistry: Post your doubts here!

    Well, I´ve researched and apparently there are hydrogen bonds between CH3F and H2O molecules... So how do you get to know that "CH3F, or any other flourine containing hydrocarbons, don't form hydrogen bonds with water" ? Here is one of the sites it does say it forms H-bonds...
  20. Namehere

    Chemistry: Post your doubts here!

    Yep, it is in the water. You need to have a hydrogen attached to O,N or F which comes into close proximity to another electronegative atom with a lone pair, as is the case of CH3F and H2O. Am i right? Anyone knows if there is H bond there? And why is it insoluble in H2O?
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