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The separation of a liquid mixture into its components on the basis of differences in boiling points. The process in which components of a mixture are separated by boiling away the more volitile liquid.

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Dipole

Refers to the separation of charge between two covalently bonded atoms.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

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.

Levorotatory

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

Reactants

Substances consumed in a chemical reaction.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Periodic Table of Elements

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.