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Absorption of high energy radiation by a substance and subsequent emission of visible light.

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Primary Voltaic Cells

Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Double Salt

Solid consisting of two co-crystallized salts.

 

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Ideal Gas

A hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory.

 

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Polyene

A compound that contains more than one double bond per molecule.