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A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.

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Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Coordination Sphere

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

Ferromagnetism

The ability of a substance to become permanently magnetized by exposure to an external magnetic field.

Forbidden Zone

A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

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.

Amide

Compound containing the O-C-N group.Compound that can be considered a derivative of ammonia in which one or more hydrogens are replaced by a alkyl or aryl groups.

 

Molecule

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