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John Cuthber

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Everything posted by John Cuthber

  1. Turst me; there will be no shortage of hot air.
  2. If I remember rightly the classic path is R-OH to RBr to RMgBr to RCH2OH I will let you work out the reagents.
  3. The assertion of mediocrity was Paranoia's not mine. I was just pointing out that paying a lot more for mediocre service is worse than paying less for it. (whatever deffinition of mediority you choose). Of course the reallity is that, compared to a hundred years ago, both services are miraculous. It's just that one is slightly more miraculous and also rather cheaper.
  4. As Ogden Nash might say these days; Candy is Dandy but liquor is quicker. Rohypnol is difficult to rhyme or scan.
  5. It would be spectacularly expensive and more than a little pointless, but yes, you could float a city on a superconductor. You would need a couple of superconducting coils to generate two fields that repelled one-another. Then you would need some more to keep the system "stable".
  6. It's OK they didn't inhale. Afterwards they settled down to watch a film about a giant gorilla...
  7. I plan to use some of the hot air to cook some popcorn.
  8. If two totally different systems both achieve mediority it sugests that anyone claiming that one of the systems is particularly good isn't paying attention. Also, if one of the two is significantly cheaper many people may prefer cheap mediocrity to expensive mediocrity.
  9. I'm not sure what you find surprising; is it the fact that the man makes a good point, or the fact that properly organised socialised healthcare is cheaper than having someone make a profit from it?
  10. From your point of view, Ebay is probably the "usual chemical supplier". Some red inks are based on eosin and some blue/ black inks are based on crystal violet, but I don't know how useful those dyes are as histological stains
  11. "Free Energy is everywhere" No it's not. Just because you keep saying it doesn't mean it's true.
  12. Well, this "Dyes are bought from usual chemical suppliers." from CharonY is the right answer. What more would you like us to say?
  13. If you didn't pay for phase contrast you almost certainly didn't get it.
  14. Copper chloride changes colour markedly as it gains and looses water. IIRC the anhydrous form is brown and with increasing water it turns yellow, then green and finally blue. You won't get CuCl ions but you will get something like a hydrated CuCl+ ion [Cu(H2O)3 Cl]+
  15. I ought to be able to identify the verbs in a sentence and then work out what nouns are the subject and object of that verb. That sort of analysis of the sentence is called parsing. I believe there are similar processes in computting where the system works out what are data and what are instructions; these processes are also called parsing. The point is that I couldn't do it with the OP.
  16. I didn't understand most of that but I think this remains both relevant and ammusing. http://xkcd.com/622/
  17. It seems to me that someone who thinks that a single person's experience is adequate data on which to base a response, is displaying exactly the sort of bias that the OP was seeking to avoid. On the other hand I suspect that practically everyone has at least some bias with respect to this question. I know I have a fairly strong opinion on the matter so I'm not giving an answer.
  18. H2O2 isn't ordinarily a solid, did you mean percarbonate or some such?
  19. That was a problem, but not the reason why it was banned. This was. http://en.wikipedia.org/wiki/Phossy_jaw It hardly matters- there's no white phosphorus in matches.
  20. "The thing it cant b impure is that when i re crystallized it, Nice blue crystals were formed. " Recrystalisation is pretty good at removing impurities so you can get nice blue crystals from a solution that isn't very pure. Also, since solutions of copper sulphate in water are blue and your stuff is green you have an impurity whether you like it or not. The most probable impurity is chloride as UC explained.
  21. Is it just me, with my my odd sense of humour, that finds it funny when someone called "verb" posts a question that I can't parse, never mind answer?
  22. "So here I am again braving it to ask you all what do you think of this.. I have been recently looking into free energy with magnets" I think you should stop. It is difficult to think of anything more robustly guaranteed to be a waste of time.
  23. Table tennis anyone? Obama Lama ping pong?
  24. Bicarbonate of soda gives CO2 and H2O on heating.
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