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The Chemical Glossary currently has 651 chemical entries. You may search the Chemical Glossary by entering the keyword in the search box or by browsing the entire chemical glossary by letter in alphabetical order.

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Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.

Debye

The unit used to express dipole moments.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Lanthanides

Elements 58 to 71 (after lanthanum).

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Metalloids

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

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

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.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.