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A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

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Critical Temperature

The temperature above which a gas cannot be liquefied, the temperature above which a substance cannot exhibit distinct gas and liquid phases.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Nonbonding Orbital

A molecular orbital derived only from an atomic orbital of one atom, lends neither stability nor instability to a molecule or ion when populated with electrons.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.