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  1. B

    Chemistry: Post your doubts here!

    A condensation reaction occurs, so naturally if we have the same number of carbons as before, it's like a self condensing reaction so I suppose that's how the ring came to be. "Ethanoyl chloride reacts violently with a cold concentrated solution of ethylamine." To quote As for the second part...
  2. B

    Physics: Post your doubts here!

    I like to remove everything from my head once the exam is done but I'd like to say that overall displacement is Larger area minus smaller area from what I know. Can't believe people are still discussing this paper.
  3. B

    Chemistry: Post your doubts here!

    Practice. I don't think it's right to ask this since the admin of Xtremepapers check the forums and ban people for discussing such questions. Good tip: memorize cation and anion rxns or at least learn to identify what the question is asking so you don't have to waste time going through the last...
  4. B

    Chemistry: Post your doubts here!

    What type of pipette? 25?
  5. B

    Chemistry: Post your doubts here!

    Thermometer to whole number like 50.0 or to .5 like 64.5 MAKE SURE YOU PUT TO ONE DP, and the only decimals are .0 and .5 Burette 0.05 for each reading.
  6. B

    Physics: Post your doubts here!

    Positive graph. so did everyone else.
  7. B

    Physics: Post your doubts here!

    It was good (A)
  8. B

    Physics: Post your doubts here!

    The screw of this instrument has 2 threads per millimeter so that it advances .5 mm for each revolution. Since there are 50 divisions around the rim, the least count and the uncertainty of this instrument is 1/50 x 0.5 mm = 0.01 mm. In reading the rim of the instrument, one must determine...
  9. B

    Physics: Post your doubts here!

    Znotes says 2 deg. IDK why mate.
  10. B

    Physics: Post your doubts here!

    check Znotes
  11. B

    Physics: Post your doubts here!

    Using water overall, yes! Liquids and other random materials like rice (we had this once) are used in the second experiment. The feb/march 2018 paper had one of the weirdest question 2s I've ever seen. It was too 'graphical' to make head or tail of that practical but it might've been easier to...
  12. B

    Physics: Post your doubts here!

    Then again, if CIE is feeling particularly nasty today and manage to stumble upon this site, they might change the experiment :p
  13. B

    Physics: Post your doubts here!

    Not a guy but I'm sure we'll have electricity. I've skimmed through EVERYTHING and electricity is the most obvious. It'll probably be related to resistors as this is quite common. Once again, I'm not 100% right but let's say 62% :(
  14. B

    Physics: Post your doubts here!

    Once your connections are right, you can complete the electricity part in less than ten minutes! :)
  15. B

    Physics: Post your doubts here!

    We don't know but it is better to STUDY electricity as knowledge beforehand is required to make sure the values you receive make sense. For example, you may get a value of current after calculations as 10A which is too much in a normal school practical. Mechanics however, is told directly and...
  16. B

    Physics: Post your doubts here!

    (LargeK-SmallK)/LargeK *100 AND (LargeK-SmallK)/SmallK *100 Both percentages can be up to 10% or 20% depending on which you choose but you have to state which percentage you choose. Tell that it is within or out of limits of experimental accuracy in the end.
  17. B

    Physics: Post your doubts here!

    Focus on electricity. Mechanics is pretty straightforward but with electricity, you have to know all about connections.
  18. B

    Mathematics: Post your doubts here!

    Not looking forward to A2 math. :(
  19. B

    A level Biology: Post your doubts here!

    Anyone else had moving cells in 34?
  20. B

    A level Biology: Post your doubts here!

    Same. The weird thing is, I added a drop of water onto the pH paper and there was literally no change.
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