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A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.

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Semiconductor

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

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Dextrorotatory

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

Salicylate

A salt or ester of salicylic acid.

Distilland

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

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Dispersed Phase

The solute-like species in a colloid.

Calorie

The amount of heat required to raise the temperature of one gram of water from 14.5°C to 15.5°C. 1 calorie = 4.184 joules.

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.