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The product of pressure and the volume of an ideal gas is directly proportional to the number of moles of the gas and the absolute temperature.

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Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Dispersing Medium

The solvent-like phase in a colloid.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Hydrolysis

The reaction of a substance with water or its ions.

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

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

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Period

The elements in a horizontal row of the periodic table.