my sons homework and i neva had a clue
2007-02-15 03:23:55 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
I was taught at school that pure oxygen was manufactured via fractional distillation of liquid air. The source below should explain in a bit more detail.
Although it can actually be produced from electrolysis of water I don't think this is how they make the stuff they see in those BOC cylinders, the electricity required to do this is too expensive for it to be commercially viable.
'Most commercial oxygen is produced using a variation of the cryogenic distillation process originally developed in 1895. This process produces oxygen that is 99+% pure. More recently, the more energy-efficient vacuum swing adsorption process has been used for a limited number of applications that do not require oxygen with more than 90-93% purity.'
2007-02-15 03:44:41 · answer #1 · answered by cobrabarmc 1 · 1⤊ 1⤋
Hydrogen peroxide slowly decomposes into water and oxygen. This process can be speeded up by using a catalyst.
One method would be to react hydrogen peroxide with manganese (IV) oxide. This would give pure oxygen and can be collected in a gas jar.
Set up the apparatus with a conical flask fitted with a thistle funnel and a delivery tube. Run the delivery tube into a trough of water containing a beehive shelf on top of which you have an upturned gas jar full of water.
Put 1 spatua of manganese (IV) oxide in the conical flask. Put in the bug containing the thistle funnel and pour the hydrogen peroxide through the thistle funnel onto the manganese (IV) oxide. The reaction will be vigorous. Oxygen will go through the delivery tube into the gas jar full of water. The oxygen will displace the water and you will end up with a fulll jar of oxygen.
2007-02-17 09:27:29 · answer #2 · answered by bluemartinhoe 1 · 0⤊ 0⤋
It starts off being made in plants by photosynthesis. In commercial production a gas factory then takes normal air and chills it. This is called cryogenic production. At different temperatures the gas will condense and these fractions are divided. First comes off carbon dioxide, then oxygen and nitrogen. Argon can be extracted too.
2007-02-15 11:36:20 · answer #3 · answered by Anonymous · 1⤊ 0⤋
The answers given are correct. But the question is why are you doing the sons homework? If it was a lab at school that your son was supposed to observe, then there are the answers.
Probably in a classroom the experiment used hydrogen peroxide, H2O2 and MnO2 ,maganese dioxide, as a catalyst, and O2 was bubbled out.
2007-02-15 12:16:02 · answer #4 · answered by science teacher 7 · 0⤊ 0⤋
They cool atmosphere or air until oxygen becomes liquid.
Liquid nitrogen has a much lower point of condensation than oxygen.
Carbon dioxide forms a solid at an even higher temp.
2007-02-15 11:45:10 · answer #5 · answered by jake y 2 · 1⤊ 0⤋
75% Oxygen 25% Nitrogen
2007-02-16 18:19:13 · answer #6 · answered by steven2008 2 · 0⤊ 1⤋
1. in lab scale you can reduce hydrogen proxide using a manganese iv oxide to get oxygen and waer
2. you can heat potasium nitrate to produce oxygen
3 in industrial scale fractional distillation of air is employed.air is liquified under high pressure & low temperature then distilled to separate oygen from nitrogen. other components of air eg water and carbon dioxide are removed before liquifaction of air occurs.
2007-02-16 10:37:14 · answer #7 · answered by kimo 1 · 0⤊ 0⤋
It is made from electrolysis of pure water. Electrolysis of pure water seperates hydrogen and oxygen completely. So you will get a pure oxygen from it.
2007-02-15 11:33:29 · answer #8 · answered by goh j 1 · 0⤊ 1⤋
By reacting manganese di-oxide with hydrogen peroxide.
This is the laboratory preparation method.
2007-02-15 11:57:23 · answer #9 · answered by Nishaant 3 · 0⤊ 0⤋
when water is seperated into it's constituents through electrolysis hydrogen and oxygen is collected as a product of electrolysis of water.
2007-02-15 12:45:41 · answer #10 · answered by George 3 · 0⤊ 0⤋