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

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Gangue

Sand, rock, and other impurities surrounding the mineral of interest in an ore.

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Chemical Change

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

Interesting facts about metals

Metals have been used by people since ancient times. All the time the process of obtaining them was improved, useful alloys of various metals appeared. Let’s look at interesting facts about metals.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

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.

 

Polarization

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

Radical

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

Pairing Energy

Energy required to pair two electrons in the same orbital.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.