What oxygen means?
Oxygen Gas:
Oxygen
occurs free as well as in combined state in nature.
It is constitutes about 48
% of the earth's crust and about 21 % of the atmosphere. In combined state, it
is present as a constituent of different compounds like acid ,base ,salt ,fat
carbohydrate ,protein, sand etc. About 72% of the human body is occupied by
oxygen. More than 49% of the materials found on the earth's surface are the
compounds of oxygen.
In
commercial level, oxygen gas in manufacture in two way's .
a) From air
b) From
electrolysis of water
From air:
The mixture
of different types of gases is collected and compressed into low volume with a
high pressure . This mixture of gasses now changes into liquid state.
In this
liquid mixture , there are only nitrogen and oxygen gases. The boiling point of
nitrogen (-196 degree Celsius) is lower than that of the oxygen (-183 degree
Celsius). So, nitrogen gas escapes out leaving only oxygen gas.
Then the oxygen
gas is collected in cylinders.
From
electrolysis of water:
The process
of obtaining oxygen and hydrogen gas from the water by passing the electric
current in the electrolyte is called as electrolysis. The electrolytes are the
ionized water, i.e the mixture of water and the acid.
Water on
electrolysis gives oxygen gas and hydrogen gas.
The Oxygen
gas can be prepared from metallic oxides and metallic peroxides. Metallic
oxides when heated gives oxygen and metallic peroxides when mixed with water
gives base and Oxygen gas. In lab Oxygen gas is prepared in two ways, i.e by
using heat and without using heat. When potassium chlorate is heated in 250
degree Celsius temperature in presence of manganese dioxides catalyst,it give
Potassium chloride and Oxygen gas. Also, Hydrogen Peroxides when mixed with the
Manganese dioxides , Oxygen gas is release with the water molecules.
Oxygen gas
is a colourless , odourless and testless gas. It's is slightly soluble in
water. It is a neutral gas.
So, it doesnot change the colour of litmus paper.
It is neither combustible and nor the supporters of combustion. It becomes
liquid on -183 degree Celsius and solid at -219 degree Celsius temperature.
Oxygen combines with hydrogen in presence of electric sparks and gives
water.
Oxygen gas
in the life supporting gas only available on this Earth. It's very important to
save this gas and utilize wisely. No Oxygen No life. Save the Oxygen and save
the future.
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