John Cuthber

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John Cuthber last won the day on September 6

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About John Cuthber

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    Chemistry Expert
  • Birthday 11/10/65

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  1. Capacitor experiments?

    Yes. The right sequence is to start by learning some science. If you can also learn how to stop your text appearing like this it will be a step forward too
  2. Galactic distribution of heavy elements

    OK, I will think about it. I have to admit I don't know much about them but here goes. Almost all the mass of the solar system is the Sun, and it hasn't got much iron in it (0.003% by number of atoms I believe) If I make the (dodgy) assumption that all the other stars and planets in the galaxy are similar then I conclude that the galaxy hasn't got much iron in it.
  3. Capacitor experiments?

    No Pressure is force/ area and there's no area defined. This goes to show the depth of your ignorance which puts the rest of your comments in context
  4. It isn't. The Kg is, by definition, based on that lump of metal. So, the answer to the question in he thread title is "no" Incidentally, it's not clear if it has lost 50µg or if the secondary standards have gained that much. That's the essential reason why they want to replace it.
  5. Intelligence test

    Unless you can come up with evidence for that, there's nothing scientific to say.
  6. WAG Trash (from Galactic distribution of heavy elements)

    Not in stellar terms. The iron in the sun is a vapour.
  7. WAG Trash (from Galactic distribution of heavy elements)

    I see an image showing where Xrays are emitted from. Nothing to do with iron; almost any element will emit xrays if it's hot enough.
  8. Because most of those metals at those concentrations will precipitate at pH10 and 12 there is no meaning to a sorption experiment in those conditions. You might be able to stop them precipitating by adding something like EDTA, but what would be the point? In the real world, there wouldn't be EDTA present.
  9. That's generally the case; it's part of the body's defence against toxic chemicals- make them more water soluble (by hydroxylation or conjugation with glucuronic acid or some such then get rid of them via the kidneys. Don't overdo the vitamin D
  10. JCVI-Syn3.0

    Somebody did something and it didn't happen by accident. Not really very ironic.
  11. Metallic lead exposed to the atmosphere typically forms a layer of carbonate on the surface. That slows down the rate of reaction. However lead carbonate is slightly soluble in water about a thousandth of a gram per litre. That's much more than the permissible levels in drinking water (and is said to be part of the reason for the fall of the Roman empire). The lead silicates in lead glass are probably roughly as soluble as the carbonate. However it's likely that, in the strongly reducing conditions in a landfill site the dominant leas species would be the very insoluble sulphide. In that case, the environmental risk is comparable with that from natural lead sulphide.
  12. Trump to recognise Jerusalem as Israel's capital.

    Is there a reason why they wouldn't vote for the teenager-dating Mr Moore without this sort of action?
  13. A different approach to drugs ?

    It's legal in the UK, the EU and the US for a start.
  14. JCVI-Syn3.0

    No, it isn't ironic at all.
  15. sunlight

    Yes, it's a dratted nuisance having to carry the sun round with you.