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exchemist last won the day on June 7

exchemist had the most liked content!

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About exchemist

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    Rowing, choral singing, walking.
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    Chemistry MA, Oxford
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    Trained as a patent agent, then gave it up and worked for Shell, in the lubricants business for 33 years. Widowed, with one teenage son.
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  1. How does that work? I would have thought the Franco-Russian Alliance would have ensured the war took place, regardless of the UK's desire to take part.
  2. No. The reason is to do with oxidations states. Ca2+ cations are already "oxidised", in that they have a +2 oxidation state, which is the highest possible for them in normal chemistry. (Ca metal, in an oxidation state of 0, reacts vigorously with oxygen.) Another way to think of it is that CaO is comprised of Ca cations with a charge of 2+ and oxide anions with a charge of 2-. In the course of the reaction between a Ca metal atom and and an oxygen molecule, two electrons are transferred from Ca, which binds them weakly, to O which binds them strongly. This results in a net release of en
  3. Recital of this victory for England always reminds me of the curious fact that at school we learned about this battle, Crecy and Poitiers, but were never told that England lost the Hundred Years War, to France. It's one example of how history is often taught, or recollected, in a partial way, in order to bolster national myths. These national myths can have real consequences.
  4. My son is, and I try to keep up, a bit. His main interest is the ancient world, but not exclusively so. I would certainly be interested in reading threads on that subject, anyway.
  5. Any fool can ask questions. Providing answers that are valid is a little harder, considering that imagination does not help much with that.
  6. In principle yes, the body's processes for regulating pH, e.g. the operation of the kidneys which transport substances against a concentration gradient, or breathing more rapidly to reduce the CO2 in the blood, can involve some energy expenditure. But only to a very minor degree and certainly not in the range it would need to be as a factor in dietary calorie control.
  7. Then the reaction has not yet reached equilibrium. Equilibrium is when the forward and reverse reactions are in balance, i.e. the rates are the same.
  8. I have no experience with this myself but my general understanding is that the adsorption capacity of activated carbon goes up with molecular weight of the substance to be adsorbed, and goes down with the degree of solubility of the substance in water. On this basis I would not expect it to be very effective at removing alkali metal cations or carbonate anions. But there may be someone else here who knows more about this in practice.
  9. That's interesting. What's the evidence for these allegations?
  10. Er, no it isn't, actually. But this is too bonkers for me. I'm out.
  11. But that is not evidence that the experiment was biased. He may simply have hoped, or expected, that a fair experiment would make his point for him. Plenty of scientists carry out experiments in the hope or expectation that their hypothesis will be confirmed by it. It's one of the most normal motives for doing science. What, in your opinion, is the evidence that the experiment itself was biased?
  12. What makes you think the diameter of the moon has any relation to the distance between Tierra del Fuego and the tip of Antarctica?
  13. Hmm, well done...but this looks like an amateur site and possibly pirated. I wonder if the site owner has got copyright licence from CRC to do this.
  14. Very interesting. In the case of Brazil, there should be access to gypsum, I'd have thought.
  15. Where are the "locals", if I may ask? I have not read about many places with strongly alkaline soil. I suppose parts of the African Rift Valley would be one of them. But in most places where pH needs adjustment, it seems that the issue is the soil becoming too acid.
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