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  1. D

    A level Biology: Post your doubts here!

    for the first time write each word in full followd by the abbreviation in brackets then use the simple word as much as you want :)
  2. D

    Chemistry: Post your doubts here!

    this is a primary halogenoalkane which always have a SN2 mechanism while undergoing reaction as for the drawing its pretty clear lone pairs shown on the nuclophile attacking the carbon with partial positive and negative on cl the intermediate shown with 5 gropus attached and then cl bond...
  3. D

    Physics: Post your doubts here!

    strange questiono_O okay here goes remember that maxima and minima are formed at alternating points for e.g if n=1 is maxima then n=3,5,7 can only be used for the n values the angle and grating are the same so dsinO is a constant and nλ should be equal to it so just put in the n values in that...
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    A level Biology: Post your doubts here!

    here you go https://www.xtremepapers.com/community/threads/may-june-2013-cie-question-papers-marking-schemes-grade-thresholds-examiner-reports.28829/
  5. D

    A level Biology: Post your doubts here!

    its somewhere here on the forums when you open it do look it up :)
  6. D

    Chemistry: Post your doubts here!

    Q1 part(a )znN03 is neutral or weakly basic? im not sure myself so a better answer would be to use carbonate and hydroxides or znO which we know react with acids Q2 the atomic radius increases down the group of halogens so the force of attraction on the shared pair of e- from the nucleus...
  7. D

    Chemistry: Post your doubts here!

    generally for heating experiments loss of heat from the container due to convection if the container is uncovered and by conduction if wool or any other material is not used for lagging also if some solid is tipped into a liquid for a reaction then you can mention that some of the solid is lost...
  8. D

    Chemistry: Post your doubts here!

    1)both propane and water must possess highly electronegative atom with atleast one lone pair of electron and atleast one of the molecule must have a hydrogen atom attached to such a electronegative atom 2)show atleast 2 h-bonds with partial positive and negative shown on the right atoms along...
  9. D

    Physics: Post your doubts here!

    no unless mentioned just displace the bob enough so that you can easily track its oscillations and measure its time period
  10. D

    Physics: Post your doubts here!

    in the dia in the diagram V the final velocity is shown as the resultant of the two vectors that are added together and one of them is U inital velocity and the other is X so X must be ut in the diagram as v=u+at
  11. D

    Physics: Post your doubts here!

    you need to know for this question that the earth is not exactly spherical but is an ellipsoid and hence its radius varies and is greater at the equator than at the poles hence the weight of any object and the normal reaction at the equator is different than at the poles hope this helped
  12. D

    Physics Waves - the *learn by heart part*

    just learn any one of the numbers given in the range for each wavelenght that you find easy to remember
  13. D

    How was physics p52

    could a C.R.O be used to measure the peak alternating current connected in series or is it only for voltage :unsure:
  14. D

    can i still get an A* in biology ?

    yeah i guess an A seems possible if your p4 and p5 went good
  15. D

    What will be my grades if I get the following?

    all A or A* i guess
  16. D

    Physics: Post your doubts here!

    it depends on uncertainity just divide the error by value of 1 division and you get no of boxes and steepest line from left to right of error bar of first and last bar making sure it passes through all bars
  17. D

    Chemistry: Post your doubts here!

    can anyone help with this if fe+3 and cl-1 are mixed will overall reaction be feasible and also of cr+2 and I2 here are the E(knot) values: fe+3 to fe+2 0.77 cl2 to cl-1 1.36 cr+3 to cr+2 1.82 I2 to I-1 0.54 mny thanks and sorry dont have marking scheme kinda home made question
  18. D

    AS PHY PRACTICAL 33

    if y-axis has cm scale and x axis millisecond scale do we have to add the powers while calculating gradient please help!!
  19. D

    AS PHY PRACTICAL 33

    yeah thanks anyways electricity will be Q1 so no reason =)
  20. D

    AS PHY PRACTICAL 33

    any errors or limitations for the electricty one people!!
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