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The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point

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Coulometry

The quantitative application of Faraday's Law to the analysis of materials. The current and time are the usual variables measured.

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.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Stoichiometry

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

Linear Accelerator

A device used for accelerating charged particles along a straight line path.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Secondary Standard

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

 

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.