Why did we use a glowing splint instead of a burning splint?
The experiment was to place 5mL of hydrogen peroxide, in a test tube. Add a pinch of manganese dioxide. And test the gas that is given off with the glowing splint.
What gas were we testing for with the glowing splint? Oxygen?
2007-10-28 06:13:14 · 5 answers · asked by tooooodles 3 in Science & Mathematics ➔ Chemistry
In order to demonstrate dramatically the superior support of combustion by "pure" oxygen over the 21% oxygen in ordinary air. A burning splint would already be burning, so no beg deal. You should have seen the glowing splint burst into flame.
2007-10-28 06:21:24 · answer #1 · answered by steve_geo1 7 · 1⤊ 0⤋
You're testing for Oxygen gas.
Oxygen itself does NOT ignite, it is non combustible but, it does support the combustion. If it was combustible, and we have 21% O2 in air, we wouldn't be here.
When a glowing splint is introduced into the Pure oxygen being produced by a reaction, the increased 'strength' of the O2 compared to that of atmospheric oxygen will cause a greater combustion reaction and the glowing splint will bust into full flame.
An already burning splint will actually burn a bit brighter but only for a very short time as it uses up the small amount of oxygen from the reaction.
(A good example of this is the flame of a welding torch.
When the torch is first ignited, the Acetylene, for example, ignites by reaction of the gas with the atmospheric oxygen but, the flame is long and smokey and will not melt steel.
When the pure O2 is introduced to the flame, it becomes very bright and many times hotter due to the increased rate of reaction and will cut through, or weld, steel).
2007-10-28 06:43:29 · answer #2 · answered by Norrie 7 · 1⤊ 0⤋
because the point is to test for Oxygen.
oxygen, when exposed to high temps. will ignite.
so, if you put a burning splint in the test tube, nothing happens because it is already burning; but, if you put the glowing splint in it....it will re-light, and then you are sure that it is oxygen
2007-10-28 06:29:26 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Why should we do your homework for you?
A glowing splint will burst into flame in the presence of oxygen. A burning splint already is flaming.
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2007-10-28 06:25:52 · answer #4 · answered by Ivri_Anokhi 6 · 0⤊ 0⤋
1...The rate of glowing of the splint will increase to the point of Ignition and the formation of a flame. 2...The above supports the fact that oxygen is needed for combustion but, itself is not combustible. If it were, the total oxygen in the earth's atmosphere will also combust completely in a gigantic explosion.....Goodbye everyone and everything.
2016-04-10 23:19:27 · answer #5 · answered by Anonymous · 0⤊ 0⤋