write a note on oxygen in 200 words
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Answers
Answer:
Oxygen is part of the chalcogen group on the periodic table. It is a very reactive nonmetal. It makes oxides and other compounds with many elements. The oxygen in these oxides and in other compounds (mostly silicate minerals, and calcium carbonate in limestone) makes up nearly half of the Earth's crust, by mass.
Oxygen is the element which most life uses in respiration. Many molecules in living things have oxygen in them, such as proteins, nucleic acids, carbohydrates and fats. Oxygen is a part of water, which all known life needs to live. Algae, cyanobacteria and plants make the Earth's oxygen gas by photosynthesis, using the Sun's light to get hydrogen from water, giving off oxygen.
Oxygen gas (O
2) was isolated by Michael Sendivogius before 1604. It is often thought that the gas was discovered in 1773 by Carl Wilhelm Scheele, in Sweden, or in 1774 by Joseph Priestley, in England. Priestley is usually thought to be the main discoverer because his work was published first (although he called it "dephlogisticated air", and did not think it was a chemical element). Antoine Lavoisier gave the name oxygène to the gas in 1777. He was the first person to say it was a chemical element. He was also right about how it helps combustion work.
At the top of the Earth's atmosphere is Ozone (O
3), in the ozone layer. It absorbs ultraviolet radiation, which means less radiation reaches ground level.
Oxygen gas is used for making steel, plastics and textiles. It also has medical uses and is used for breathing when there is no good air (by divers and firefighters, for example), and for welding. Liquid oxygen and oxygen-rich compounds can be used as a rocket propellant.
Explanation:
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Note on 'Oxygen': 200-250 words↓
Oxygen is a gas that is colorless and odorless and a key element in the composition of several compounds. Almost all organisms need oxygen to survive, but it is only trees and some microbes that can produce oxygen through photosynthesis. Oxygen reaches our body through respiration and absorbed by cells for proper functioning. And oxygen is also required for creating energy.
Fire will extinguish in the absence of oxygen. Earth’s nature provides us oxygen in abundance, and we must keep the resources pollution free so that the air we inhale is not toxic. Water is another crucial element that sustains life and is formed by the amalgamation of two gases, namely hydrogen and oxygen.
The oxygen cycle is the process that involves the production of oxygen by plants and after that an organism (including plants) using oxygen for respiration and releasing carbon dioxide, and this carbon-dioxide again being used for photosynthesis. This cycle of using oxygen maintains the amount of gas in the atmosphere.
Water is also an essential component of our environment that is required to sustain life. Water sources on Earth are rivers, streams, rain, ponds/lakes, underground, seas, and oceans. The water forms a part of the ecosystem called the marine or aquatic ecosystem. Water is the habitat for organisms like fishes, sharks, whales, sea horses, etc. And these organisms are sources of our food and also a contribution to the economic assets. Plants and animals both require water for their growth.
Almost sixty percent of our body is made of water. Water helps in blood circulation, lubrication of joints, keeping our body cool by sweating, releases toxins from our body. Water other than drinking is also used by us to clean ourselves, and bathing is essential for maintaining our body temperature. Water is also used to manufacture several products, generate electricity (hydro-electric power), etc.
Both oxygen and water are essential for survival. Excess of any of these is harmful, like excess of oxygen, cough, muscle turbulence, loss of vision, and can be fatal and excessive consumption of water can harm our kidney. Polluting any of the two resources will result in creating an adverse effect on the environment. We must strive to keep our environment clean so that we can breathe pure air and drink clean water. The conservation of both resources is vital to continue life by maintaining balance in the ecosystem.