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The indicator of spontaneity of a process at constnt T and P. If delta-G is negative, the process is spontaneous.

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Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Extensive Property

A property that depends upon the amount of material in a sample.

Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Equation of State

An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Fluorescence

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

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Hydrocarbons

Compounds that contain only carbon and hydrogen.