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Double bonds that are separated from each other by one single bond -C=C-C=C-.

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Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Oxidation Numbers

Arbitrary numbers that can be used as mechanical aids in writing formulas and balancing equations, for single- atom ions they correspond to the charge on the ion, more electronegative atoms are assigned negative oxidation numbers (also called Oxidation states).

All Chemicals - Chemical Glossary

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.

Boiling Point

The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.

Periodic Law

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


The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

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.



A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.