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OXYGEN
Oxygen is the second most electronegative substance after fluorine, and forms thermodynamically stable compounds with usually all elements. It rivals fluorine in the ability to stabilize the biggest known oxidation states of many elements, as where there is no corresponding fluoride being and OsVIIIO4. Oxidation reactions with O2 are usually slow because of the strength of the O=O double bond (490 kJ mol-1).
Oxygen is the most abundant substance on Earth, making around 46% of the Earth's crust by mass. The commonest minerals are complex oxides such as carbonates and silicates. Oxygen is also a constituent of water, and of usually all biological molecules. Atmospheric O2 collects almost entirely from photosynthesis by green plants, and is not found on other known planets. Reactions involving dioxygen, both in respiration and in photosynthesis by air-breathing animals, are important for biological chemistry.
Oxygen may be extracted from the atmosphere by fractional and liquefaction distillation. The liquid boils at 90 K and is dangerous when collide with combustible materials. The compressed gas is used in the liquid and metallurgy as an oxidizer for rocket propulsion.
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The emission spectrum of hydrogen is found to satisfy the expression for the energy change. teiangle E (in joules) such thatTriangle E= 2.18x10(1/n 2 1 - 1/ n 2 1 ) J where n
The ratio between kinetic energy and the total energy of the electrons of hydrogen atom according to Bohr's model is: (1) 2 : 1 (2)1 : 1 (3)1 : - 1 (4)
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Classification of polymers - Fibres These are the polymers that comprise strong intermolecular forces among the chain. These forces are either hydrogen bonds or dipole-dipole i
Acetone - Aldehydes and Ketones It is a symmetrical or simple ketone and is the first member of the homologous sequence of ketones. In traces, it is exist in blood and urine.
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