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A thin partition between two solutions through which certain molecules can pass but others cannot.

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Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

Acid Anhydride

Compound produced by dehydration of a carbonic acid. General formula is R--C--O--C--R. Chemical compound that reacts with water to form an acid and are usually oxides of nonmetallic elements.

Phosphorus Oxychloride

Colorless to slightly yellow fuming liquid.

Mol. Wt.: 153.39
M.P.: 20C
B.P.: 105.1C
Density: 1.685 @ 15.5C
Vapor Pressure: 40 mm @ 27.3C
Vapor Density: 5.3
Used as the phosphorus source for phosphorus diffusion.

Allotropes

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

Aromatic Hydrocarbons

Benzene and its derivatives.

Continuous Spectrum

Spectrum that contains all wave-lengths in a specified region of the electromagnetic spectrum.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

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.