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The ability of a substance to be broken down into simpler substances by bacteria.

 

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Anion

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

 

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Physical Change

A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.

 

Ionic Compounds

Compounds containing predominantly ionic bonding.

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Isoelectric

Having the same electronic configurations.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.