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A theory of chemical bonding based upon the postulated existence of molecular orbitals.

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Heat of Fusion

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.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Electrolyte

A substance whose aqueous solutions conduct electricity.

 

Fossil Fuels

Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale.  For further information see Fuel Chemistry

Solution

Homogeneous mixture of two or more substances.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.