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  1. Z

    Chemistry: Post your doubts here!

    Why is the 2nd one not feasible?
  2. Z

    Chemistry: Post your doubts here!

    tysm!
  3. Z

    Chemistry: Post your doubts here!

    cis trans is only in planar ones?
  4. Z

    Chemistry: Post your doubts here!

    Only when MN04- is hot and concentrated?
  5. Z

    Chemistry: Post your doubts here!

    This one too.
  6. Z

    Chemistry: Post your doubts here!

    Why would HO2CCO2H react with MN04- ions? and which reaction is this?
  7. Z

    Chemistry: Post your doubts here!

    https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_s17_qp_43.pdf can someone explain 3bii, the coordination and formulae of D AND F?
  8. Z

    Chemistry: Post your doubts here!

    https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_s17_qp_43.pdf here in 2ci while calculating the conc of OH- at the end why do we use the total volume of 50cm^3 ? wouldn't the volume be used up during titration?
  9. Z

    Chemistry: Post your doubts here!

    hey, what's the diff between the blue and green ones? :/
  10. Z

    Chemistry: Post your doubts here!

    can someone tell about the solubility of amides and amine in HCL? and with cold/hot hcl?
  11. Z

    Chemistry: Post your doubts here!

    https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_s17_qp_42.pdf for Q7 what is the diff b/w test 1 and 2? aren't the both to test for chloride ions?
  12. Z

    Chemistry: Post your doubts here!

    https://papers.gceguide.com/A%20Levels/Chemistry%20(9701)/9701_s17_qp_42.pdf for Q3Biii why do we divide the answer in ii by 3? pls explain
  13. Z

    physics p42 discussion

    was there another part? after the light damping one, where they asked for the reason? something related to energy
  14. Z

    Physics: Post your doubts here!

    there were two marks and then 3 for the explanation abt energy loss?
  15. Z

    Chemistry: Post your doubts here!

    for NMR, say that the peak splits into three, so there are 2 H on the adjacent carbon atom but what if there are two adjacent carbon atoms?
  16. Z

    Physics: Post your doubts here!

    series of X-ray images (for one section/slice) M1 taken from different angles M1 to give image of the section/slice A1 repeated for many slices M1 to build up three-dimensional image (of whole object) A1 these are the five points acc to a ms of S14
  17. Z

    Physics: Post your doubts here!

    image of one slice/section images (of one slice) taken from different angles to give 2D image (of one slice) (repeated for) many slices to build up 3D image (of whole body/structure) thats four points, no idea about the 5th one.
  18. Z

    Physics: Post your doubts here!

    also since decay constant is big, half life is lesser acc to the eq relating the two
  19. Z

    Physics: Post your doubts here!

    yh, that's an easy A*
  20. Z

    Physics: Post your doubts here!

    changes in height much less than radius of Earth M1 A1 so (radial) field lines are almost parallel or g=GM/R2 ≈GM/(R+h)2 this is what's worth for 2 marks in mark scheme
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