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Thread: Why we don't spontaneously combust! ;)

  1. #1 Why we don't spontaneously combust! ;) 
    Bullshit Intolerant PhDemon's Avatar
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    One for the SHC cranks and fools to read!

    https://www.chemistryworld.com/news/...007617.article


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  3. #2  
    Forum Professor Zwolver's Avatar
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    Something from there popped into my eyes..

    "The possible resonance forms in which electrons can be distributed in the dioxygen diradical".....

    I never heard about this one...


    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  4. #3  
    exchemist
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    Quote Originally Posted by Zwolver View Post
    Something from there popped into my eyes..

    "The possible resonance forms in which electrons can be distributed in the dioxygen diradical".....

    I never heard about this one...
    I've just read this and I must admit I find the article rather contrived. It's not about spontaneous combustion at all of course. It is just a jazzed up way of talking about the 2 unpaired electrons in O2 and why they don't make it more reactive than it is.

    The explanation in terms of resonance is also a bit complicated. I rather prefer the MO model to account for oxygen's triplet ground state, as illustrated in the diagram in this article: https://en.wikipedia.org/wiki/Triplet_oxygen - although I suppose the two are really equivalent ways of coming to the same conclusion.

    I quite like the description in this article of O2 having one sigma bond and 2 half pi bonds (i.e. 2 pi-bonds but each of them half cancelled by the single electron in the antibonding pi* orbital. It's a bit like the triple bond in nitrogen but half cancelled.

    P.S. I see Wiki thinks the article is in need of expert attention, but the diagram looks OK to me at any rate.
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  5. #4  
    Bullshit Intolerant PhDemon's Avatar
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    A contrived article in Chemistry World! Say it ain't so , it has turned into a bit of a comic of late, I only posted it as a bit of a joke!
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  6. #5  
    exchemist
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    Quote Originally Posted by PhDemon View Post
    A contrived article in Chemistry World! Say it ain't so , it has turned into a bit of a comic of late, I only posted it as a bit of a joke!
    Yes I guessed that much. But actually this is quite interesting chemistry, I think. There is a nice little family of odd electron molecules involving N and O, isn't there? All of which break the rules my son is learning at school at the moment, so I have to keep my mouth shut about them.
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  7. #6  
    Bullshit Intolerant PhDemon's Avatar
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    Ah, the "lies to children" I often have to stop myself going "off spec" in class and teaching them what actually happens rather than what the examiner is expecting to see!
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