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A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

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Bonding Pair

Pair of electrons involved in a covalent bond.

Metallurgy

Refers to the overall processes by which metals are extracted from ores.

Ioniztion

The breaking up of a compound into separate ions.

Equilibrium Constant

A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

Period

The elements in a horizontal row of the periodic table.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.

Mole Fraction

The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

Helium

Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4

Inhibitory Catalyst

An inhibitor, a catalyst that decreases the rate of reaction.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.