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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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Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Doublet

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

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Radiation

High energy particles or rays emitted during the nuclear decay processes.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.