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CyberGnu
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of the Virtual Serengeti
Apr 1999
time: 05:28
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Urban:
quote:
Hm, since methane is not soluable in water, it's not acidic? |
Classical acidity is a measure of how easily a molecule donates a proton. A strong acid like HCl donates the proton very easily, a molecule like water is somwhat in the middle, and a molecule like methane is pretty much impossible to deprotonate. The reason is the stability of the resulting ion. Chloride ion is a very stable ion, so HCl -> H+ + Cl- is a facile reaction. H2O -> H+ + OH- is also OK. But CH3- is an amazingly unstable ion, so that won't work...
See what I mean?
Water solubility isn't technically connected to acidity, but it does have a huge effect because of solvation of the resulting ions.
quote:
Hm, say if you reduce iron oxide with methane, do you get CO2 and H2, or the other way around? |
Don't think you can get H2 that way. This is a standard redox reaction:
4FeO + CH4 -> CO2 + 2H2O + 4Fe
Were you thinking of human perspiration, perhaps? The iron in our heme proteins are oxidized by oxygen from 4 Fe(II) to 4 Fe(III), which then reacts with some carbohydrates to yield CO2 and H2O.
You could have be thinking of steam reformation, as well:
CH4 + H2O <=> CO + 3H2
an industrial process, possibly catalyzed by iron... 
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Az
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MACEDONIA - It's the name of the sovereign country to the north of Greece
Apr 2000
time: 07:28
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don't confuse the Leopard with the Chitah. The Leopard weighs almost 100 kgs on average. a human could easily wrestle the chitah down, even bare-handed, it weighs around 42 kgs, and is build for speed. A few good punches to the ribs, and heck, it's head is around the size of two fists, so it will make a great coat.
IIRC, Lions weigh around 190 kgm, on average, with males significanlty heavier, and females significantly lighter. a band of 3 human hunters with spears could take on any lion, but it would take small hunting party to take out a pride.
a skilled human with a crossbow and a long knife is fearsome opponent. Only a Tiger could take him out.
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Urban Ranger
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Apolyton Duke of Off-Topic
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quote:
Originally posted by CyberGnu
Well, that's the point of a bettery, right? 
The energy in a battery is stored as chemical energy, which means that a chemical reaction has to occur for the energy to be released. Chemical reactions are often quite slow, though, so when you battery runs out the first time you still have some potential energy stored, but the reacting chemicals aren't in position to react yet. |
Yes, that's the main point. I was also thinking along the lines of additional electric characteristics of a battery, that it has an internal capacitance. So, in addition to the chemical reaction, it could store up some electricity as well, giving it a bit of an extra kick. Of course, I have no idea how big that would be.
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15-05-2003 17:56
), but it's not like they actually are bothering anyone.
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