ok so students were doing some experiment and a gas was produced. they think the gas is hydrogen, how can they be sure?
does it turn back into water in contact with oxygen?
2007-03-23 03:08:12 · 4 answers · asked by ♥ hey! 2 in Science & Mathematics ➔ Physics
You just need to place a lighted splinter or if you prefer a burning one near the gas. On the laboratory scale, especially where students are working, the amount of hydrogen produced won't be that considerable. So you will hear a tiny 'pop' sound. If there had been a lot of the gas, then there would have been an explosion. At that scale, no major explosions. Believe me, I do this confirmatory test nearly every week in my chemistry class. Incidentally, to check for oxygen, just light a splinter, then extinguish it right away. While the burnt bit is still glowing hot, put it immediately in the gas to be tested. If the gas is oxygen, the splinter will relight right away and you will get back your burning splinter without lighting up a match again.
Hope it helps.
2007-03-23 03:23:44 · answer #1 · answered by Farhali 2 · 0⤊ 0⤋
place a lighted splinter at the mouth of the test tube.
the flame will extinguish with a "pop" sound.
no, it doesn't turn back into water when in contact with oxygen.
2007-03-23 03:16:07 · answer #2 · answered by pigley 4 · 1⤊ 0⤋
Light a match. If it explodes it's hydrogen.
2H(2) + O(2) --> 2H(2)O
If this is more than a theoretical question, be careful: Enough hydrogen and you can burn off your eyebrows, set yourself on fire, or REALLY hurt yourself.
2007-03-23 03:14:28 · answer #3 · answered by Garrett J 3 · 1⤊ 0⤋
using a flame
2007-03-23 03:15:39 · answer #4 · answered by JwH 2 · 0⤊ 0⤋