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The release of heat by a system as a process occurs.

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Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Saccharide

An organic compound containing a sugar or sugars.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

yttrium

A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."

Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Ionization

In aqueous solution, the process in which a molecular compound reacts with water and forms ions.

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.

Inner Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals for one shell inside the outermost occupied shell in its hybridization.

Law of Conservation of Matter

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

Coordination Sphere

The metal ion and its coordinating ligands but not any uncoordinated counter-ions.