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John Cuthber

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John Cuthber last won the day on September 21

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About John Cuthber

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    Chemistry Expert
  • Birthday 11/10/1965

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  1. Heat the copper in air and it will oxidise.
  2. English is not the only culprit Un sot avait pour mission de faire parvenir le sceau d'un seigneur à son roi. Il le mit dans un seau et partit à cheval. Le cheval fit un saut et les trois (word) tombèrent. How do you spell the word in brackets which sounds like the English word "so" or, if you like, "sew".
  3. Depending on circumstances, the best bet might be to heat the copper so that it oxidises slightly. Copper (II) oxide is black and, because it is formed on the surface of the metal it should carry heat to it well.
  4. I would bet that you are wrong, and so would the entire electricity generating industry.
  5. It isn't represented very well. A set of semi-circles would be a better picture than a set of bars. This has been pointed out to you before. You persistently troll your unrealistic view. Again, that's simply not true. It it was, the designers of NMR machines would have a much easier time. If you think about that, you will realise it is nonsense It can't go from + to - without going through zero And if it is zero in some places, but not others, it is not homogeneous. And, because you don't have a sensible model of what the field is like, your ideas about what would happen if you moved a conductor through that field are also wrong.
  6. On the whole, this is a bad idea- lots of toxic waste for no great purpose. Never bath in Irish Stew, It's the most illogical thing to do, But should you go against my reasoning, Don't fail to add the appropriate seasoning ! Author: Spike Milligan OK so, now we have got that out of the way... You can dissolve mercury in a solution of iodine and potassium iodide. And, if you make that solution alkaline, most metals will not dissolve, so you can filter them off as hydroxides etc. If you then add formaldehyde, it will reduce mercury back to the metal and precipitate it. Some other metals will remain in solution. So that removes most of the metals from the mercury. If you need to ask for details then you don't know enough about it to do it safely- so don't try. Distillation works better but is really not a "home experiment" thing. Electrolytic purification is an interesting idea, but probably too difficult - and generates lots of mercury waste. But the best advice is just don't bother.
  7. Not necessarily. You could have an infinite number of cats spaced every metre on an infinitely long line. Or 1 cat on each of the intersections of an infinite square array Or even on the apexes of an infinite array of intersections of a 1 metre "3D" grid. The cats in in the last scenario would definitely overheat. I think the ones in the first scenario (a line of cats) would be OK on that score. I'm not sure about a planar array of cats. But there's no problem putting a space between the cats to make room for a listener. The big problem would be herding the cats.
  8. Sensei, Did you really read this and think that this was going to help?
  9. How good does it need to be? Is the maths here good enough? https://en.wikipedia.org/wiki/Oil_drop_experiment#Method
  10. If, as seems likely, their thoughts and ideas were subject to various irrational influences, it's rather likely that the outcome was irrational. At best, this looks like an accidental debate about what "rational" means.
  11. You might want to discuss that with the Jews or the Pagans or the followers of Shinto or... just about anyone. Like...?
  12. Really? How did they avoid the glitches in thinking that we are all susceptible to unless we take care- things like confirmation bias Because those things stop people being rational, even today when we know about them.
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