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  1. Saturation

    Chemistry MCQ thread...

    yes, but how do you calculate it!?
  2. Saturation

    Chemistry MCQ thread...

    1 is probably because since this is ionic, when you put it in water it splits up in Na+ and RO- , which attracts the water molecules (hydrated ions).
  3. Saturation

    Chemistry MCQ thread...

    Anyone? :good:
  4. Saturation

    Chemistry MCQ thread...

    Q21, HELP! Q 39: It's nucleophillic addition, since halogenoalkane is being hydrolyzed to alcohol, so 1 is right. X to Z does represent the activation energy, so 3 is right, which means that 2 has to be right aswell, so it's A. (I'm guessing that since the C-Hal bond is breaking, so as it's...
  5. Saturation

    Chemistry MCQ thread...

    How do you do number 7!? (please show full working!) http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf
  6. Saturation

    Chemistry MCQ thread...

    For the reactions of gases at rtp, you can use the reacting volumes of the gasses as the molar ratio of the equation. Form combustion equations for the 1st and last alkanes. CH4+2O2 = CO2 + 2H20 So it will become: 10 cm3 of CH4 react with 20 cm3 of O2 to give 10cm3 of CO2 ( This doesnt apply...
  7. Saturation

    Chemistry MCQ thread...

    Hydrogencarbonate anion is formed when H2CO3 (carbonic acid) ,looses a Hydrogen ion ( proton), which means it has the same number of electrons as H2CO3. Total electrons: 2+6+(3 x8) = 32, so it must be C. the formula is: number of MOLES = volume/ 24 (this is because at rtp. 1 mole of any...
  8. Saturation

    Chemistry MCQ thread...

    READ THE NEXT POSTS PLEASE! (This was a double post, and I couldn't delete it :no: )
  9. Saturation

    Physics and Chem MCQ Queries!!!

    You shouldn't worry about that diagram at all! The most obvious on is right there, which is B! D looks like diagonal overlapping of orbitals, which has nothing to do with AS! And yeah Q5 C, because the time base is increased, each square represents 20 ms, so more of the graph can be represented...
  10. Saturation

    Physics and Chem MCQ Queries!!!

    Question 5 Chem is B, It's about Pi and sigma bonds. Pi bonds are formed when two "p" atomic orbitals overlap sideways, as shown in the diagram. sigma bonds are fomred between 2 "s" orbital, 2 "p" orbitals or an "s" and "p" orbital : http://www.goiit.com/templates/default/ ... fig.42.gif edit...
  11. Saturation

    Oxidising alchols?

    So in a nutshell: TOLLENS and FEHLINGS reagents do NOT oxidise alcohols right? And thanks for the replies!
  12. Saturation

    Oxidising alchols?

    Which means that Tollens and fehlings reagents are only used for reactions (tests) with aldehydes or ketones right!?
  13. Saturation

    Oxidising alchols?

    Ok, so I know that primary and secondary alcohols are oxidised with potassium dichromate and permanganate, but will they also get oxidised with FEHLINGS or TOLLENS reagents?
  14. Saturation

    Chemistry MCQ thread...

    For the electonegativitey qs. can you please explain the "diagonal fact" as in like, how we form the diagonal!?
  15. Saturation

    Chemistry MCQ thread...

    Thanks for clearing up the previous doubt! Ok, I remember this qs was discussed before, but anyways: http://www.xtremepapers.me/CIE/Internat ... 2_qp_1.pdf Number 11. My textbook says that the rate of reaction always starts from the highest, and then as the reactants are used up and all, it...
  16. Saturation

    Chemistry MCQ thread...

    http://www.xtremepapers.me/CIE/Internat ... 4_qp_1.pdf Question 12, Why is the answer B!? Why can't it be C?
  17. Saturation

    physxx mcQ

    anyone!??
  18. Saturation

    Chemistry MCQ thread...

    what I think is that it's because when you dissolve MgCl2 in water the pH is 6.5. Although my teacher said that is was C and that the ms must be wrong! :unknown:
  19. Saturation

    physxx mcQ

    whats the answer?? Is it B?
  20. Saturation

    Physics P1 questions! HELP!

    yeah, I feel the same! It's definitely the lack of time with paper 1, but I guess you gotta get used to putting down the answer, and resisting the urge to double check it! :%)
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