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  1. Z

    Chemistry Paper One Problems

    At first glance, the answer APPEARS to be B, as the reaction is exothermic and so the backward reaction would be favoured. However, you need to keep in mind that a temperature change increases the average kinetic energy of the particles in the reaction -- therefore, the speed of the forward...
  2. Z

    CHEMISTRY MCQ TIPS

    Heres a condensed version: 1. If the first choice is definitely incorrect, the answer is always C. If not, go to step 2 2. If the second and last choice is definitely incorrect, the answer is D. If the second is correct and last is not correct, answer is B. If both are correct, go to...
  3. Z

    Calculator model n number??????????

    CIE doesn't care. Our center invigilators don't even look at our calculators.
  4. Z

    chemistry mcq on bond angles help needed

    Yes! the double bond is considered as a single bond For example: X=Y=X X-Y-X They both have a bond angle of 180 degrees
  5. Z

    physixx mcqs

    Well the formula for potential energy is mgh. In the figure, if both levels are equal, then the one on the right is losing half of its height right? Also, it is losing half of its mass! the new values: m = m/2 h = h/2 so solving for potential energy: PE = mgh PE = (m/2) x (h/2) x (g) PE = (mgh/4)
  6. Z

    physixx mcqs

    This used to confuse the hell out of me too! What you have to do is think of the dots as stuck in a vertical plane. The dots cannot move in a horizontal direction, only a vertical one. THE DOTS CANNOT MOVE. ONLY THE WAVE. So for example since the wave is moving towards the right, dot A will be...
  7. Z

    general paper probable questions????

    I think there might be a question regarding the Arab Spring that is currently going on. But then again, I don't know if that is a bit too recent to be placed in a CIE paper.
  8. Z

    Reasonable estimates

    Thanks so much! ^_^ (Also just 1 correction: I think the energy in 1 KwH is 3.6 MEGAjoules not just joules)
  9. Z

    Reasonable estimates

    I think energy released from 100kg of coal is much more than 1010 J, as seeing that a match releases 1000J O_O
  10. Z

    Electromagnetic spectrum

    Rabbits - radio Mate - micro In - infrared Very - visible Unusual - ultraviolet eXpensive - Xrays Gardens - gamma Thats the way I remember the order of wavelengths. As for the actual values, good luck, as you'll probably have to do rote memorization
  11. Z

    ELECTROMAGNETIC SPECTRUM

    Guys its the same value! haha 0.5 * 10^-6 IS EQUAL TO 5*10^-7
  12. Z

    Phase difference..

    First find the phase angle of each particle, then subtract! :) To find phase angle where it is not obvious: You need to know the wavelength of the wave, and the distance of the particle from where the wavelength is 0. Phase angle = (distance of particle from 0 / wavelength) * (2(pi)) Hope you...
  13. Z

    Common Values for AS Physics?

    @workinghard thanks so much! though the list looks pretty scary ahah
  14. Z

    The Ultimate AS Physics Thread

    (i): since maximum height is 0.98m, v = 0 at max height v^2 = u^2 + 2as 0 = u^2 + 2(-9.81)(0.98) u = 4.4 ms-1 (ii): 1. From the problem part we know that the velocity with which ball hits the floor is 6.2 ms-1 From the previous part the velocity with which ball leaves ground is 4.4 We take one...
  15. Z

    Common Values for AS Physics?

    Those were just an example, the rest of them would be preferable :D
  16. Z

    Common Values for AS Physics?

    After going through a bunch of physics paper 2s, I've seen a lot of those problems where you have to give an approximate value of things, such as the mass of an apple or the speed of sound in air. Could someone post a list of the common values?
  17. Z

    Physics Past Papers 22 (2002-2010) Discussion

    viewtopic.php?f=26&t=7477 Post it there, you will definitely get some help. And instead of using imageshack just attach it to your post so that it automatically loads up.
  18. Z

    AS PHYSICS WAVES NOTES

    This looks pretty useful! Just a question: does it contain everything in the AS syllabus (the fundamental parts atleast)?
  19. Z

    The Ultimate AS Physics Thread

    Just think about it logically. Imagine shining a flashlight through a hole in the wall. On the other side, the point of light will by very small. However, when you make the hole bigger, the point of light on the other wall also gets wider! Hope this helps :)
  20. Z

    The Ultimate AS Physics Thread

    You're right o.o No idea how wavelength is connected to the brightness o_O
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