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tetroxide
noun
Any oxide containing four oxygen atoms in each molecule
Exact(32)
At any specified temperature and pressure, there is a definite probability per unit time that a nitrogen tetroxide molecule will dissociate into two nitrogen dioxide molecules and that the latter will recombine to form a dimer.
At low pressures or at high temperatures, NO2 has a deep brown colour, but at low temperatures the colour almost completely disappears as NO2 dimerizes to form dinitrogen tetroxide, N2O4.
The oxidizer used with hypergolic fuel is usually nitrogen tetroxide or nitric acid.
The powdered metal, even at room temperature, exudes the characteristic odour of the poisonous, volatile tetroxide, OsO4.
Red lead, or lead tetroxide (Pb3O4), is another lead oxide whose two most important uses are in paints and as an addition to litharge in storage batteries.
Other oxidizers that have seen operational use are nitric acid (HNO3), hydrogen peroxide (H2O2), and nitrogen tetroxide (N2O4), which are liquids under ambient conditions.
In ICBMs and other similar guided missiles that must stand ready for launch on short notice, noncryogenic (or "storable") propellant systems are used, as, for instance, an oxidizer fuel mixture of nitrogen tetroxide and hydrazine unsymmetrical dimethylhydrazine (also designated UDMH; [CH3]2 NNH2).
The chemical relaxation of nitrogen tetroxide is easy to visualize, and it illustrates principles common to all relaxation phenomena.
Nitrogen tetroxide (formula N2O4; also called dinitrogen tetroxide) actually is a dimer (a molecule formed from two similar constituents called monomers) that dissociates into two molecules of nitrogen dioxide (formula NO2).
Similar(2)
The higher oxidation states +6 and +8 are much more readily obtained than for iron, and there is an extensive chemistry of the tetroxides, oxohalides, and oxo anions.
Measurements of sound propagation through the gas nitrogen tetroxide which breaks up, or dissociates, into nitrogen dioxide led Nernst to suggest that experiments at frequencies at which the dissociation reaction could not keep pace with the temperature and pressure variations that occur within a sound wave would permit evaluation of the dissociation rate.
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