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Density is the ratio b/w Mass and Volume: D=M/V

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Oxidation of metals in the presence of air and moisture.

Eluant or eluent

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



An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.


A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).


Solid triester of glycerol and (mostly) saturated fatty acids.


Different forms of the same element in the same physical state.

Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.


For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Activity Series

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