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05-12-2005, 05:57 PM
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#31 | | Junior Member
Join Date: Feb 2005
Threads: 6
Posts: 104
| Actually I just looked it up
"in order to explode, hydrogen must be mixed with oxygen. In fact, a flaming splint
that is thrust into a container of pure hydrogen will be extinguished, since hydrogen does not support
combustion." http://www.chemistry.org/portal/reso...t/car_1200.PDF
its on the third page, last sentence of paragraph with the "1." infront of it. | 
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05-12-2005, 05:58 PM
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#32 | | Member
Join Date: Aug 2004 Location: NJ, USA
Threads: 27
Posts: 501
| Yeah, that may be all well at good, but it was a glowing splint, not a flaming one. It makes a difference. | |
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05-12-2005, 06:02 PM
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#33 | | Member
Join Date: Jan 2005
Threads: 14
Posts: 342
| I'm 99% sure it pops. We do this experiment in both Chem Honors and AP Chem at the beginning of the year as sort of a "demo" thing, and it always "pops". | |
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05-12-2005, 06:02 PM
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#34 | | Junior Member
Join Date: Feb 2005
Threads: 6
Posts: 104
| Umm.. from the same document:
"Hydrogen is very flammable, but in order
to burn, it must come in contact with oxygen, and in order to explode it must be mixed with oxygen before
being ignited. A glowing splint thrust into pure hydrogen will be extinguished" | |
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05-12-2005, 06:08 PM
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#35 | | Junior Member
Join Date: Feb 2005
Threads: 6
Posts: 104
| Well anyway, I think the cb is looking for the answer you provided, I don't remember the setup of the experiment. I think they just said put a glowing splint into 3 bottles, what would happen. So in that case your right, as opening the bottles exposes them to air. | |
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05-12-2005, 06:09 PM
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#36 | | Member
Join Date: Jan 2005
Threads: 14
Posts: 342
| And on another site it says: "You can try collecting the gases with inverted small test tubes, and use a burning splint to test for hydrogen (the tube will pop) and a glowing splint to test for oxygen (the splint will burst into flame). " http://www.wcsscience.com/electrolysis/ofwater.html | |
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05-12-2005, 06:11 PM
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#37 | | Junior Member
Join Date: Dec 2004 Location: the midwest
Threads: 4
Posts: 282
| maybe it pops and then goes out? or maybe this argument has gone on way too long about way too trivial a point. yes. | |
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05-12-2005, 06:11 PM
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#38 | | Junior Member
Join Date: Feb 2005
Threads: 6
Posts: 104
| Ya I don't know how the experiment was set up. If its actually pure hydrogen then I am right, but it probably wasn't. Well maybe they will give me 1/2 credit. | |
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05-12-2005, 06:13 PM
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#39 | | Member
Join Date: Jan 2005
Threads: 14
Posts: 342
| Maybe, but I'm pretty sure they said it was in some container and they opened it up and put in the glowing splint . . . and like people've pointed out already, opening the container would expose the hydrogen to a little O2 and thus cause the highly exothermic reaction | |
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05-12-2005, 06:56 PM
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#40 | | Junior Member
Join Date: Aug 2004
Threads: 10
Posts: 65
| what did you guys get for the stronger acid in #1? | |
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05-12-2005, 07:00 PM
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#41 | | Senior Member
Join Date: Oct 2004 Location: Warrenton, VA
Threads: 39
Posts: 1,508
| methanoic i think ... the 2nd one.. whichever that was | |
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05-12-2005, 07:01 PM
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#42 | | Member
Join Date: Apr 2005
Threads: 118
Posts: 551
| I got that the first acid was strongest... the one listed at the top | |
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05-12-2005, 07:02 PM
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#43 | | Member
Join Date: Dec 2004 Location: FL - yes i know it sucks here
Threads: 30
Posts: 649
| Oh yeah it was methanoic acid. | |
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05-12-2005, 07:02 PM
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#44 | | Junior Member
Join Date: Aug 2004
Threads: 10
Posts: 65
| Yeah I got propanoic, which was at the top | |
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05-12-2005, 07:02 PM
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#45 | | Member
Join Date: Apr 2005
Threads: 118
Posts: 551
| Also, for sig figs I said 6.1 x 10^2 because 610 has 3 sig figs (arguably) | |
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