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  1. 1

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_43.pdf 1(c)(ii) what do we write for this? because what i think is that answer should be is he hydrogen molecules dont have enough kinetic energy to move in mars so they escape they...
  2. 1

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_41.pdf number-2b(iii) for the (ii) we calculated work done by area under the graph and got 240 not for calculating the work done for Q--->R how is the work done=0 which s given in the question...
  3. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    and thanks alot for your Duas:)
  4. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    obviously it does but graphite is better to use because of its low cost
  5. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    in the book they have mostly mentioned platinum.
  6. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    can u please tell me the CIE books number as iam not able to view ur uploaded pictures
  7. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    sorry iam having some internet connection problems see what ut saying regarding electrode potential is RIGHT but thats the other way using reactivity seires IAM sure about i mentioned that becuase u mentioned concentration becuase these are 2 ways we use to use when we were not introduced to...
  8. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    if u need more explantion at that then see Copper + NaOH-----> no reaction because Nais more reactive then copper so hydrogen remains as atom and leaves the solution gets discharged now H2 + Cu(OH)2 -----> there will be a reaction and A copper ATOM Cu will get dischared at the cathode becuase...
  9. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    isnt hydrogen low in reactivity series then Na(sodium) and it gets dicharged then Na but Copper gets discharged preferentially then Hydrogen because its lower in reactivity series then hyrogen isnt it??
  10. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    Graphite is it self inert electrode so u can use that for electrolysis BUT for some electrolysics such as that of Brine(Nacl) for that there are specific electrode that could be because they must be more suitable for that experiments their are always exceptions. plus if your talking about...
  11. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    exactly regarding the "Solution Concentration" this is basically what u studied in olevels and As even in A2 but its mostly asked in AS not in paper-4 because in paper-4 (A2) this want u to use the electrode potential to solve the problem having said that they stil have discussed about the...
  12. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    and regarding graphite i didnt really got what u want to ask because we use graphite because its inert and obviously we use it in its pure form because impurities will effect its properties
  13. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    different names they are because i my self didn't know what it was just saw on your link it was written it equal to eror over oroginal value meaning it the fractional error btw this name is never mentioned in paast papers or Cie books so u shouldn't woory much about it
  14. 1

    Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

    2)relative error is fractional error
  15. 1

    Chemistry Paper 4-theory- doubts =D

    Gémeaux hows ur preparation going on? how many past papers done? anything left for revising from the book? asking becuase your one of the top ones here
  16. 1

    Chemistry Paper 4-theory- doubts =D

    It is a good book but requires need of teacher because things are here and there i havent studied much from there Cie endorsed book are good ones u must surely go through from them as well my suggestion
  17. 1

    Chemistry Paper 4-theory- doubts =D

    which golden book?
  18. 1

    Chemistry Paper 4-theory- doubts =D

    and guys iam not hear 24 hours plus iam not a really good student just an average student so cant help much but will try my level best mostly i'll be asking question :p
  19. 1

    Chemistry Paper 4-theory- doubts =D

    honestly speaking u can use both ways but that sort of memorizing the ways those are ways which people memorize but the main deal is to understand what u are studying that why i explained the real thing going on but u can use any method which your most comfortable with. the main thing in these...
  20. 1

    Chemistry Paper 4-theory- doubts =D

    its simple as hydrogen electrode potential=o so electrode potential obtained on the voltmeter= electrode potential of the platinum
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