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The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

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Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Autoionization

An ionization reaction between identical molecules.

Coulometry

The quantitative application of Faraday's Law to the analysis of materials. The current and time are the usual variables measured.

Law of Conservation of Matter

There is no detectable change in the quantity of matter during an ordinary chemical reaction.

Voltaic Cells

Electrochemical cells in which spontaneous chemical reactions produce electricity, also called galvanic cells.

 

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.