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A substance whose aqueous solutions do not conduct electricity.

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yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

Oxidation-reduction Reactions

Reactions in which oxidation and reduction occur, also called redox reactions.

Optical Isomers

Stereoisomers that differ only by being nonsuperimposable mirror images of each other, like right and left hands, also called enantiomers.

Matter

Anything that has mass and occupies space.

Cathode

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

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.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Chemical Change

A change in which one or more new substances are formed.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.