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Everything posted by Darkblade48

  1. I don't think people are here to do your Fermi problems for you. Skye has already pointed out an interesting way to look at the approach of calculating the number of electrons in a 5000 kg elephant (humans are about 72% water, so you can probably assume an elephant is about the same, and from there, just assume that it's 100% water)
  2. It doesn't have more energy levels, it has more filled energy levels (i.e. 3 electrons in lithium as opposed to 1 in hydrogen. If you are talking about (i.e.) the Px, Py and Pz orbitals, then they have the identical energy regardless of whether or not they are under a magnetic field. Yes, they also have the same properties. If an electron is energetic enough to be in the Px orbital, it has an equal chance of being in the Py or Pz orbitals as well.
  3. A short look on the net yielded the following: 1 Cations 2 Carboxylic acids, Thiocarboxylic acids, Selenocarboxylic acids, Sulfonic acids,Sulfinic acids,Sulfenic acids 3 Esters, Acyl chlorides, Amides, Imides, Amidines 4 Nitriles, Isonitriles 5 Aldehydes, Thioaldehydes 6 Ketones, Thioketones 7 Alcohols, Thiols, Selenols, Tellurols 8 Hydroperoxides 9 Amines, Imines, Hydrazines 10 Ethers, Thioethers, Selenoethers 11 Peroxides, Disulfides
  4. I'm not too sure if this answers your question (I may be just interpreting it incorrectly). Since you are asking for the initial amounts, you just need to read the question, as it is provided for you (... if 0.550mol of each PCl5 and PCl3 was initially introduced into the flask?) Thus, you know that the initial amounts of PCl5 and PCl3 were 0.550 moles each. From here, as Borek stated, you can write out your reaction equations and solve for the equilibrium amounts of the reactant and products (i.e. using an ICE table)
  5. What about organic dyes made from aniline (i.e. mauveine, fuschine, etc)?
  6. Well, making aspirin itself isn't difficult, but the acetic anhydride precursor may be more than slightly difficult to obtain.
  7. I believe the same question was posted here: http://www.scienceforums.net/forums/showthread.php?t=21678
  8. Acetone just acts as a solvent for the styrofoam; you're simply dissolving the styrofoam into a form that lacks the air bubbles.
  9. Very unusual, the problem seems to be resolved now; perhaps it was just a temporary error. And I wasn't using https on a computer not configured for secure http; as I often use both http and https prefixes for accessing Sciencemadness
  10. Is there anyone else other than me that cannot access their site (forums and even the main site)? When I attempt to go to the forums, I get a "404 Not Found error", and when I go to the main site, I get a "There is no website configured at this address" error. I hope someone knows what the issue is, perhaps they are just having server problems?
  11. Technically, tin foil used to be made with tin, but it would leave a funny taste when used to cover food, so it's been changed to aluminum (foil) now. However, the name "tin foil" still remains in use, even though technically, the foil is no longer made of tin. Just a brief history lesson for you As for your chemistry related question, no, I don't believe aluminum foil will react with an ammonia solution to create a gas.
  12. In general, carbon atoms that are singly bonded to other carbon atoms are sp3; double bonds indicate sp2, and triple bonds indicate sp.
  13. From another forums, where either you, or other classmates that are doing the same homework as you...
  14. That information would be in his signature...
  15. You are wrong' date=' esters undero reduction with LiAlH4 It is heptyne. You are correct on this. As long as the sodium hydroxide does not react wtih the amide, then you can use it. As for your (second) last question, I don't have the time to think about it now, I am (stupidly) surfing the forums when I have a biochemistry exam in less than 3 hours
  16. I'm not quite sure what you mean by "the mechanism of activated carbon when using K3PO4 or KOH as a chemical activate" Also, what do you mean by "the reaction or equation for the iodine number"??
  17. Well, even in normal tap water, I can't imagine any reactions that would affect the volume to that extent.
  18. This would make sense if it was water being mixed with another liquid, but in bharatiyedu's case, it is water being mixed with water. If you measure out 50 mL of water twice, and pour it into another container, barring user error, there should be 100 mL of water.
  19. Despite your effort to block the cap opening with the liquid, chances are that the hydrogen molecules just managed to "slip out between" the plastic molecules, due to the small molecular size of hydrogen.
  20. I believe they have silver fulminate in them.
  21. The mineral acid is merely a source of readily available protons that are needed to catalyze the Fischer esterification. Sodium bicarbonate is used to remove the remaining acid that has not reacted.
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