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A plant extract that has a distinctive odour or flavour.

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Secondary Standard

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

 

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.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Outer Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Rate-law Expression

Equation relating the rate of a reaction to the concentrations of the reactants and the specific rate of the constant.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.