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  1. Alchemist4lyf

    The book :D

    The book :D
  2. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Salam mates. I have this problem on the Electromagnetic Spectrum part of the Physics syllabus. Could someone please explain to me, what types of wavelengths in the spectrum, are penetrating, and what types are not. For example, if short or long wavelengths are absorbed or reflected. A source...
  3. Alchemist4lyf

    Maths, Addmaths and Statistics: Post your doubts here!

    Need help with question 3, the coordinates of P. Mark scheme says it can be found using a vector method, so if anyone knows that, I'd love to see it.
  4. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Here you go Salman. I hope I'm right. The answer's right, so probably the method is too. H2 + Cl2 ==> 2HCL. 1 mol of H2 gives 2 moles of HCL. so 2.5/2 moles of H2 gives 2 moles of HCl. Now, from the equation, we see that when 2 moles of HCL are formed, energy is -184Kj. so by ratio, when 2.5...
  5. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Exactly..
  6. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Well, I think I might have an answer to your questions. The first part is basically easy because carbonates react with acids to form a salt, water and carbon dioxide. The pH of soils, increase as a result. I assume you already know the basic equations for this one. As for the second part, I have...
  7. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Alright, this time, thank you for the nice reply ^_^. But, as you can see, I'm just guessing. I may be wrong, but at least I'm trying. This time, I'm going to sit it out. See what the others have to say. :)
  8. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Chillax mate. It's only an opinion. Alright, how's about this one... you said, that the glass prism was in the open, not sunlight or cold weather. Well, that being said, it is safe to assume that temperature variations will be present, because 22 days is a lot of time, and the weather will not...
  9. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    I know that the grass catches fire because the prism has exploded, releasing heat, so 5 marks there :D. As for the prism, I'd say, it might have something to do with the over-heating due to too much total internal reflection of light. Or, because the prism has refracted too much light towards...
  10. Alchemist4lyf

    Maths, Addmaths and Statistics: Post your doubts here!

    Thanks a ton man. Actually, what I was trying to do, was joining the lines of the larger triangle inverted, and its centre of enlargement. 'Cause, I thought it was first enlarged, and then reflected. But it's the opposite case. Anyway, thanks man ^_^
  11. Alchemist4lyf

    Maths, Addmaths and Statistics: Post your doubts here!

    Hey. I got most of the question, but just couldn't figure out the center of enlargement. I got the scale factor too. Can you please, like, give a rough description of how you got the sketch. Please :)
  12. Alchemist4lyf

    Maths, Addmaths and Statistics: Post your doubts here!

    I think the answer is, it has a rotational symmetry of order 2. You see, as the quadrilateral is a parallelogram, it has a rotational symmetry of order 2, because, in a 360 degrees turn, it will look exactly the same as the original shape, only twice, i.e once in the original shape after the 360...
  13. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Thanks a lot mate. I was thinking the answer was something along those lines, but that formula thingy, helped. :)
  14. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Oh, and I have a small question. How is it, that the speed of sound is affected by temperature and humidity changes? I have a slight idea, but I'm not really sure about it. Can you help a brother out? :)
  15. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    I really don't think this question has to be answered quantitatively. You see, we found out the body is accelerating. And that acceleration, is 3.52. Now, that is a positive acceleration, which is increasing the velocity of the body as it is greater than 1. Now, as we might recall, friction is a...
  16. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Sorry. Small mistake. 1. Cations which get discharged due to high concentration are Zinc, Iron, Lead. 2. Hydrogen, Copper, Silver, Gold will get discharged anyway, due to preferrential discharge. 3. The ions above Zinc, such as Aluminium and stuff, are too electropositive, as Ktc mentioned. So...
  17. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Thanks man. For that indepth reply. Thing is, I asked my chemistry teacher as well. He says, that Cations ARE discharged if in higher concentration, but this is never asked in O' Levels. All they ask is for anions, particularly, Chlorine. The Cations which are discharged due to higher...
  18. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Alright. Thanks for that. But I'm still skeptical on this one. I'll wait until someone else also answers, because this seems very important. Thanks a lot :)
  19. Alchemist4lyf

    Biology; Chemistry; Physics: Post your doubts here!

    Salam all. I have this small question, which has recently been bugging me. It's about the concentration of ions and its effect on selective discharge in the electrolytic process. I need to know. Is the concentration of ions effect (higher concentration, first to discharge, regardless of position...
  20. Alchemist4lyf

    Maths, Addmaths and Statistics: Post your doubts here!

    Re: O'level Maths, Addmaths and Statistics help available he Yar. I haven't got any tips for you, mainly because no one else gave me any tips :D. But, thing is, just practice past papers. A lot of them. I've done quite a lot till now, so what I'll be doing today and tomorrow inshAllah, is I'll...
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