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Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

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DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Aromatic Hydrocarbons

Benzene and its derivatives.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Electrophoresis

A technique for separation of ions by rate and direction of migration in an electric field.

Chemical Change

A change in which one or more new substances are formed.