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A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

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Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

Distillate

The material in a distillation apparatus that is collected in the receiver.

 

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Coke

An impure form of carbon obtained by destructive distillation of coal or petroleum.

Equivalent Weight

An oxidizing or reducing agent, who's mass gains (oxidizing agents) or loses (reducing agents) 6.022 x 1023 electrons in a redox reaction.
The mass of an acid or base that furnishes or reacts with 6.022 x 1023 H3O+ or OH- ions.

Degenerate

Of the same energy.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Particulate Matter

Fine divided solid particles suspended in polluted air.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

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