有關science 的問題...急急急急!!!!20點!!!!!

oxygen:
melting point:-222.80 C
boiling point:-182.97 C
property of oxygen:Oxygen is a reactive gas. It can react with most of the metal(except Au, Pt, etc) to form corresponding metal oxide.It is essential for most organisms(except some anaerobic organism) to live as oxygen can recat with the food of the organism in respiration and provide energy of the organism live
carbon dioxide
It is colourless, odourless and not flammable. Solid carbon dioxide will sublime(ie:direct turn to gas without turn to liquid) under haeting in room pressure.It is slightly soluble in water and form an acidic carbonic acid. It can react with alkali. It can turn clear lime water milky.
nitrogen
melting point:-210.01 C
boiling point:-195.80 C
It is colourless, odourless and not flammable.It is very unreactive. But under very high temperature, it would react with some reactive metal like Mg.
neon
melting point:-248.59 C
boiling point:-246.08 C
It is colourless, odourless and not flammable nor toxic.It is very unreactive.It seldom have reactions as it is a noble gas
argon
melting point:-153.7 C
boiling point:-150.2 C
It has silmliar property as neon.

你好曳呀！ :]
（雖然我都唔識！）
haha!
上堂先算……

O..... it is hard one

Oxygen is a kind of gas , which is called 氧氣 in chinese.

We need oxygen every time .

Carbon dioxide is non-colour,odour and not flameable.

Carbon dioxide is a kind of gas , which is called 二氧化碳 in chinese.

Eventhough , carbon dioxide is dangerours if we 'eat' it too much in our boby .

I just kown some of them , don't mind it.

I don't kown are they really can help you , but please give me some other to my e-mail .

My e-mail is : [email protected]

I am P.6 now .

Call me super.