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A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

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Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Acetic Acid

CA3COOH, clear, colorless liquid, pungent odor. Boiling point 140C, flash point 54C (closed cup), autoignition temperature 38OC.

Standard Electrode Potential

By convention, potential, Eo, of a half-reaction as a reduction relative to the standard hydrogen electrode when all species are present at unit activity.

 

Forbidden Zone

A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Critical Point

The combination of critical temperature and critical pressure of a substance.

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Saccharate

A compound formed by interaction of sucrose with a metallic oxide, usually lime, and useful in the purification of sugar.

 

End Point

The point at which an indicator changes colour and a titration is stopped.

Positron

A Nuclear particle with the mass of an electron but opposite charge.