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  1. E

    CIE Results

    Got 3A* in AL Congrats everyone
  2. E

    Mathematics: Post your doubts here!

    Yeah time was tight for me too Don't know/think I did anything wrong and I just need to lose less than 8 marks for a star even with high grade boundaries Hate it when they pull the vague answers in the ms, why even bother at that point
  3. E

    Mathematics: Post your doubts here!

    Welp, finally done with my exams. Anyone else did 32 today?
  4. E

    Physics: Post your doubts here!

    You are talking about I₀ here? it would be the incident wave, ie the wave produced by the speaker not the one reflected by the wall
  5. E

    Mathematics: Post your doubts here!

    Ouch sorry man Thing is I did check if they were arranged but I guess I did that wrong? lol
  6. E

    Mathematics: Post your doubts here!

    No way....**** my life
  7. E

    Chemistry: Post your doubts here!

    First time seeing reduced pressure filtration in march 19, anyone have a list of procedures we should know?
  8. E

    Physics: Post your doubts here!

    The equation depends on how you define the terms: (generally these two are constant) U is increase in internal energy q is heat supplied to system If w is work done on system, then: U = q + w If w is work done by the system, then: U = q - w Think of how the work changes the internal energy...
  9. E

    Physics: Post your doubts here!

    Is the ms for march 19 out?
  10. E

    Physics: Post your doubts here!

    Anyone have a list of common circuits or something to answer these questions?
  11. E

    Physics: Post your doubts here!

    You should link or screen shot the entire question. Anyways: The blue graph is the load voltage with the full bridge rectifier but without the capacitor The red graph is with the capacitor added, minimum voltage of 3v
  12. E

    Physics: Post your doubts here!

    Can someone mark the direction of the back emf generated by the relay here?
  13. E

    Chemistry: Post your doubts here!

    Did 41 Nmr CH3CH2OCH2COCH3 Vap 31
  14. E

    Chemistry: Post your doubts here!

    If the molecule only had one primary and one tertiary H atoms, the ratio would be 21:1, but since there are 9 primary H atoms for every one tertiary, that increases its relative rate by 9 times, 21:9.
  15. E

    Chemistry: Post your doubts here!

    Al2O3 is a reducing/dehydrating agent, so it wouldn't react. We only have oxidation of alkyl benzene by KMnO4, so you have to say no reaction.
  16. E

    Chemistry: Post your doubts here!

    I'm guessing you have the rate equation from previous parts? The rate equation gives you the molecules involved in the rate determining step (or, if one of the reactants in the rate determining step is a product from another step and doesn't show up in the overall reaction equation, it will...
  17. E

    Chemistry: Post your doubts here!

    You need a catalyst to substitute a halide into a benzene ring, like AlBr3. The left ring is a phenol which reacts without a catalyst.
  18. E

    Chemistry: Post your doubts here!

    "The amine formed will react with the acid to form a salt."
  19. E

    Chemistry: Post your doubts here!

    First question Carboxylic acids don't react with HCL, cold or not. Are you thinking of amides or esters? Did you answer b(ii)? the groups that react with cold NaOH will make the molecule soluble, from the list that's phenols and carboxylic acids. (Both amide and ester alkaline hydrolysis need...
  20. E

    Chemistry: Post your doubts here!

    Damn, really? do you know how other groups compare to each other in terms of shift value/electronegativity?
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