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Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.

 

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Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Alpha Particles

A helium nucleus.

Aldehyde

Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H

 

Distilland

The material in a distillation apparatus that is to be distilled.

Ore

A natural deposit containing a mineral of an element to be extracted.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Freezing Point Depression

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

Fatty Acids

An aliphatic acid, many can obtained from animal fats.