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The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

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Solvolysis

The reaction of a substance with the solvent in which it is dissolved.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Mass Action Expression

For a reversible reaction, aA + bB cC + dD the product of the concentrations of the products (species on the right), each raised to the power that corresponds to its coefficient in the balanced chemical equation, divided by the product of the concentrations of reactants (species on the left), each raised to the power that corresponds to its coefficient in the balanced chemical equation. At equilibrium the mass action expression is equal to K, at other times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Atom

The smallest particle of an element.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Pairing

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

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.