what is oxygen explain 700 words
Answers
Oxygen and its compounds play a key role in many of the important processes of life and industry. Oxygen in the biosphere is essential in the processes of respiration and metabolism, the means by which animals derive the energy needed to sustain life.
Oxygen, symbol O, colorless, odorless, tasteless, slightly magnetic gaseous element. On earth, oxygen is more abundant than any other element.
Oxygen was discovered in 1774 by the British chemist Joseph Priestley and, independently, by the Swedish chemist Carl Wilhelm Scheele; it was shown to be an elemental gas by the French chemist Antoine Laurent Lavoisier in his classic experiments on combustion.
Large amounts of oxygen are used in high-temperature welding torches, in which a mixture of oxygen and another gas produces a flame of much higher temperature than is obtained by burning gases in air. Oxygen is administered to patients whose breathing is impaired
Gaseous oxygen can be condensed to a pale blue liquid that is strongly magnetic. Pale blue solid oxygen is produced by compressing the liquid. The atomic weight of oxygen is 15.9994.Oxygen composes 21 percent by volume or 23.15 percent by weight of the atmosphere; 85.8 percent by weight of the oceans and, as a constituent of most rocks and minerals,
46.7 percent by weight of the solid crust of the earth. Oxygen comprises 60 percent of the human body. It is a constituent of all living tissues; almost all plants and animals, including all humans, require oxygen, in the free or combined state, to maintain life.3
Three structural forms of oxygen are known: ordinary oxygen, containing two atoms per molecule, formula O2; ozone, containing three atoms per molecule, formula O3; and a pale blue, nonmagnetic form, O4, containing four atoms per molecule, which readily breaks down into ordinary oxygen. Three stable isotopes of oxygen are known; oxygen-16 (atomic mass 16) is the most abundant. It comprises 99.76 percent of ordinary oxygen and was used in determination of atomic weights until the 1960s.
Oxygen is prepared in the laboratory from salts such as potassium chlorate, barium peroxide, and sodium peroxide. The most important industrial methods for the preparation of oxygen are the electrolysis of water
MARK BRAINLIEST
Oxygen :-
Oxygen is a very important gas. It is present in the air. The presence of oxygen makes it possible for human beings, plants and animals to stay alive. When we breathe, our lungs take oxygen from the air. It is not just living things that use oxygen. A flame needs oxygen to burn. If there were no oxygen, even lighting a matchstick would not have been possible.
Oxygen - symbol - O
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Occurrence of Oxygen :-
Oxygen is the most abundant element in the earth's crust. It is present in water and in the atmosphere. The earth's crust contains 46 per cent of oxygen by mass. The proportion of oxygen by mass in seawater is about 86 per cent. The proportion of oxygen in the atmosphere is 21 per cent by volume.
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Discovery of Oxygen :-
Oxygen was discovered in about 1772 by a Swedish chemist, Carl Wilhelm Scheele. An English chemist, Joseph Priestley, independently discovered oxygen in 1774. A French chemist, Antoine Lavoisier, first recognised the gas as an element and named it 'oxygen' in 1779. He explained combustion as the union of oxygen the burning material, that is, fuel.
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Properties of Oxygen :-
☆ Physical properties of oxygen ☆
• Nature : Oxygen is a colourless, odourless and tasteless gas
• Density : It is slightly heavier than air
• Solubility : It is slightly soluble in water
• It becomes a liquid below -183°C
• It becomes a solid at about -218.4°C
☆ Chemical properties of oxygen ☆
• Action on litmus: Oxygen is neutral to litmus. This means it does not change the colour of litmus paper
• Combustibility: Oxygen supports combustion. It reacts with metals and non-metals to form respective oxides. For example, iron reacts with oxygen to form iron oxide. Similarly, carbon reacts with oxygen during combustion to form carbon dioxide
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Know your scientists!
Carl Wilhelm Scheele ( 1742-1786 ), a Swedish chemist, discovered oxygen in 1772. He obtained it by heating potassium nitrate ( KNO₃ ), mercury oxide ( HgO ) and many other compounds.
Joseph Priestley ( 1733-1804 ), an English philosopher and experimental chemist, is best known for his contribution to the chemistry of gases. He discovered 10 new gases including oxygen, sulphur dioxide and carbon monoxide.
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