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

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Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, there is no net change in concentrations of reactants or products while a system is at equilibrium.

Avogadro's Number

The number (6.022x10^23) of atoms, molecules or particles found in exactly 1 mole of substance.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Accuracy

How closely a measured value agrees with the correct value.

Anion

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

 

DP number

The degree of polymerization, the average number of monomer units per polymer unit.