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  1. Z

    Super confusing permutation and combination question for me

    Re: Super confusing permutation and combination question for The question requires you to choose 3 of the given objects and arrange them. This basically is a problem stating in how many ways can you arrange any 3 of the given objects. (This question is tricky because we have restricted the...
  2. Z

    Super confusing permutation and combination question for me

    Okay, I made this question on my own and as expected I couldn't solve this question. So, here is the question: In how many ways can 3 of the letters chosen from the given set be arranged: AAABBBCCCDDDEEF That is first you have to choose 3 letters and then arrange them. In how many ways can...
  3. Z

    O/N 2010 P63 Q. no.: 6 (ii) and (iii)

    Why can Mrs. Lin sit anywhere in the last 3 rows? Suppose the first row has Mrs. Brown and 2 business men. The second row has Mr. Lin and Mr. Brown. That leaves only 1 place in the second row. So, if Mrs. Lin is to be behind a student, she cannot be on the second row but she can only be in one...
  4. Z

    chemistry p4 topics to stress on

    Nanotechnology: Nanomaterials fall into two categories: a. Fullerenes b. Inorganic nanoparticles A. Fullerene -Any molecule composed entirely of carbon in the form of a hollow sphere, elllipsoid or tube - Spherical fullerene called Buckyball - Cylindrical nanotube called buckytube Fullerenes...
  5. Z

    chemistry p4 topics to stress on

    Electricity conducting plastics: -The molecule has alternating single and double bonds resulting in s conjugated system -The system can have cis or trans configuration -Technically conducting polymers are semi-conductors as they have to be doped in order to make them conductors -Conjugated...
  6. Z

    Chemistry P4 Help needed

    I have posted the reply here: viewtopic.php?f=26&t=8283
  7. Z

    Chemistry Paper4 discussion

    (i)4 The cross given is useful to start the thought process. Draw a horizontal line in the figure from the cross. The first separation would have resulted in separation along the line That line becomes the initial starting point for the second chromatography. Thus, the number of columns of dots...
  8. Z

    Chemistry Paper4 discussion

    It is possible when we use CONENTRATED HCl. The standard E values apply for concentration of 1mol/dm3. However, is we use the concentration far greater in excess of 1mol/dm3 , the E value of Cl2/Cl- becomes less positive as the equilibrium lies well to the left dude to the very high concn of...
  9. Z

    Chemistry P4 Help needed

    dude, this is color thing is AS stuff. As A2 "senior" you must know the answer to AS!
  10. Z

    Chemistry P4 Help needed

    A2. What doesn't satisfy me about your explanation is: If it was "compactness" as you put it, determining the color, the intensity of the SAME COLOR would deepen. To put it into perspective, Cl2 is yellowish green. So, Br2 would have to darker yellowish green ,not REDDISH BROWN!
  11. Z

    Chemistry P4 Help needed

    HOW?????????? Please explain
  12. Z

    Chemistry P4 Help needed

    first it was me who asked the question (confusion between zeena and zeebu). I don't think intermolecular forces account for the deepening of the color
  13. Z

    Chemistry P4 Help needed

    what kind of help do you require with benzene?
  14. Z

    Chemistry P4 Help needed

    can you please explain why the color of halogen deepens down the group! The syllabus mentions n-(pi)* transition but I seriously am at loss to understand that!
  15. Z

    Guys please help me how do i prepare for chemistry applicati

    Re: Guys please help me how do i prepare for chemistry appli yep, I definitely think so. If we fully internalize the facts mentioned in the booklet, we should be able to score high marks in the application part (barring the crazy nanotech part of course)
  16. Z

    prepare General paper in five minutes..!!!

    usle bujha, naam ta Nepali nai lagyo
  17. Z

    prepare General paper in five minutes..!!!

    chahine kura lekhnu parcha ni! :evil:
  18. Z

    Guys please help me how do i prepare for chemistry applicati

    Re: Guys please help me how do i prepare for chemistry appli Read the application booklet!
  19. Z

    Chem P4 eelctrode potential help

    it would be easier if you could attach the question!
  20. Z

    physics p5 discussion

    As far as I remember, we need to know the effect of change in B (due to the AC in coil X) on the magnitude of emf induced in coil Y. So, coil X is supposed to have a power source connected to it as a source of AC(which could be the signal generator). But coil Y cannot have power source connected...
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