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The ratio of the density of a substance to the density of water.

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Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

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.

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Basic Salt

A salt containing an ionizable OH group.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Fluorescence

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

Free Radical

A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.

Isomers

Different substances that have the same formula.

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.