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A term used to describe molecules and polyatomic ions that have one atom in the center and six atoms at the corners of a octahedron.

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Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

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.

Melting Point

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

Chemical Change

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

Particulate Matter

Fine divided solid particles suspended in polluted air.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.