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The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

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Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Chemical Hygiene Officer (CHO)

A person or employee who is qualified by training or experience to provide technical guidance in the development and implementations of the provisions of a Chemical Hygiene Plan (CHP)

yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Allotropes

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

Free Radical

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

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.