• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. J

    Troubles in chem p1

    oh damn sorry, i meant CaCO3 is higher polarized, and BaCO3 is less polarized** and it doesnt matter if you are good or bad in chem, we all get better with practice :)
  2. J

    Troubles in chem p1

    i believe only 3 are made because, as you can see, the question says 9 carbon atoms must remain in the end. So if you look at the far right side, you'll see a double bond with a CH3 attached. Heating with conc. K2Cr2O7 will indeed introduce OH to both C=C bonds present in the molecule, but you...
  3. J

    Troubles in chem p1

    for future reference, if you could throw in the answer key with the paper link, it would be quite helpful :) 16 would be C because of the keyword "effervescence", something you should almost always associate with CO2. We got the initial eff. because of CO3 in BaCO3 decomposing, as it is highly...
  4. J

    Troubles in chem p1

    I know this sounds long and tedious, but the sure-shot way would be for you to calculate the MR of all the mentioned nitrates, divide 3 grams on each to see the number of moles it would represent, and then see if said nitrates decomposition product [lets call it XO] fits the bill, as it will...
  5. J

    How was physics p52

    guys is it wrong if we use signal generator to change frequency? and i connected CRO with coil...is that ok? and CRO needs a seperate power supply right? my points were basically: read frequency off time base of CRO calibrate CRO and check y-gain and time-base before connecting use large...
  6. J

    Chemistry Grade Thresholds

    1) you've already made another similar thread, in the future try to put all your points in one thread as that will increase your chances of getting answered completely. 2) the paper 3 is of 40 marks but paper 5 is of 30 marks. Thus to even them out paper 3's marks are changed from out of 40 to...
  7. J

    Bio P5 Q2!

    i should also add that degrees of freedom apply to both X2 and t-test and the reason behind it is simply to compensate for the number of comparisons we have made as they have a direct effect on our value for X2/T-test obtained.
  8. J

    Bio P5 Q2!

    I said value quoted within 0.05 actually :) but yes i should elaborate that, 0.05 value or larger then 0.05 value being our value means the result is due to chance.
  9. J

    Bio P5 Q2!

    Ok well heres what i've understood from the stuff that comes in Q2, hope it helps and please correct me anywhere if i am wrong! STANDARD DEVIATION: amount of scatter about the mean. 95% results will lie within mean +2 where is STANDARD DEVIATION value. STANDARD ERROR: should the mean be...
  10. J

    Physics P5 All Info You Need !!

    dont we have to connect a current to the hall probe btw? and i believe the equation for that was something like Vh/vd = B.
  11. J

    Physics ppr 5 discussion

    Shouldnt we have also kept the d and h constant?
  12. J

    Physics P5 All Info You Need !!

    GUYS you can get the uncertainty both by subtracting log of mean from log of max OR subtracting log of minimum from log of max and dividing by 2!
  13. J

    Physics P5 All Info You Need !!

    Yeah, can someone confirm this please?
  14. J

    9709/52 Q2-b how to find absolute uncertainty

    what i do for these questions is i take the uncertainty in the original table value and then multiply it with my 1/h or whatever is in the second table...the answers are always correct...
  15. J

    AS Physics Practical - Paper 34

    Im afraid not, since the plunger was to be removed from the experiment. I think they might have added this measure to check if paper was leaked o_O
  16. J

    Physics P5 All Info You Need !!

    yes it did, thanks! but could you please clear some more stuff up for me? : sometimes the sgf in the question in the table have been to both 3 and 2 sig figs, can i then take my choice of them? because the examiner is really confusing in that regard also, alot of the times the line i draw may...
  17. J

    Physics Paper 5 - Problems.

    yes well 10% is from the +-3 N part but i didnt really understand why we had to do 2x gradient uncertainty either :/
  18. J

    Urgent query regarding AS Chemistry! Someone please help me out!

    Could you elaborate what you mean by that? like, your teachers compare you to the international GT for that year or something? Anyway, I think the total number of marks for an A* in chemistry is supposed to be about 190-200/270, so your aim should be that much overall, HOWEVER, you will have to...
  19. J

    Physics Paper 5 - Problems.

    i think it was u derived from best gradient - u derived from worst gradient/u derived from best gradient x 100
  20. J

    Physics P5 All Info You Need !!

    I've been going through some P5 papers for physics and these are some discrepancies i've found if someone could please clarify for me? 1) do we have to make only 1 of the worst fit lines or both? 2) do we HAVE to do gradient upper limit - gradient lower limit/2 for uncertainty of gradient or...
Top