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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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Band

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

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Electrodes

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

Ferromagnetism

The ability of a substance to become permanently magnetized by exposure to an external magnetic field.

Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.

 

Alkaline Earth Metals

Group IIA metals

Hydrometer

A device used to measure the densities of liquids and solutions.

Period

The elements in a horizontal row of the periodic table.