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The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

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Monoprotic Acid

Acid that can form only one hydronium ion per molecule, may be strong or weak. Acid that contains one ionizable hydrogen atom per formula unit.

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Insoluble Compound

A very slightly soluble compound.

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

yttria

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

Optical Isomers

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