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A substance that cannot be decomposed into simpler substances by chemical means.

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Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

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.

Extensive Property

A property that depends upon the amount of material in a sample.

xylose

A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Conjugate Acid-base Pair

In Bronsted-Lowry terminology, a reactant and product that differ by a proton, H+.

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.