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A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.

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Alkaline Battery

A dry cell in which the electrolyte contains KOH.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

xenon

A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Particulate Matter

Fine divided solid particles suspended in polluted air.

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.

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.