有什麼方法可以證明氮（nitrogen)的存在

The method 方法 :
Burn a magnesium ribbon in the unknown gas, and then heat the solid residue formedwith water. If the unknown gas containsnitrogen, a pungent gas (ammonia) is formed which changes moist red litmuspaper to blue.
把鎂條於未知氣體中燃燒，然後把殘留固體加水共熱。若未知氣體含有氮，則會產生一剌鼻氣體（氨），該氣體可使紅色石蕊試紙變藍。


The explanation解釋 :
Burning magnesium reacts with nitrogen gas to give solid magnesium nitride.
燃燒的鎂與氮反應，生成固態氮化鎂。
3Mg(s) + N2(g) → Mg3N2(s)

Magnesium nitride reacts with water to give ammonia, which will escape from thereaction mixture when heated.
氮化鎂與水反應，生成氨。當受熱時，氨從反應混合物中逸出。
Mg3N2(s) + 3H2O(l) → 3MgO(s) + 2NH3(g)

2011-09-14 19:30:47 補充：
這方法所用的化學反應，並不在現存的中學化學科考試範圍內。

其實003個方法有小小問題如果CO2 係0.03%...
咁隻1咪唔會轉
理論上差唔多所有gas都做到e個效果
因為佢熄係因為無O2 ma....
姐係1支Argon都可以整熄佢
你根本differentiate唔到佢係咩gas..

Among them, the most possible gas stored in the test tube is carbon dioxide and nitrogen.
如果我fill1支argon比你
唔話你聽佢係咩gas...
咁用你個方法
結論就會係支野係nitrogen..
好荒謬wor=.=..

Here is a simple way, but may not be so accurate. I think you are studying Form 2 integrated science. In Unit 7 Living Things and Air, you have learnt how to test oxygen, carbon dioxide and water vapour. But the textbook tells you nitrogen is fairly unreactive, there is no simple test for nitrogen.

The method is the same as testing oxygen. Light a wooden splint to get a burning splint . Bring the burning splint to a test tube filled with nitrogen gas. If the gas is nitrogen, the flame will go out quickly.

But if you see this phenomenon, the gas in the test tube can also be carbon dioxide , neon , argon and helium . Among them, the most possible gas stored in the test tube is carbon dioxide and nitrogen.

So you need to have two test tubes containing the same gas. One test tube has been used in the above test. Use the other test tube, but this time use hydrogencarbonate indicator (you should know this chemical). Add a few drop of hydrogencarbonate indicator to the test tube, if the indicator changes from red to yellow , it is carbon dioxide. If the indicator remains red in one test tube, and the flame goes out in another test tube, it is very probably nitrogen.

No,nitrogen is an unreactive gas.(There is no simple test for nitrogen.