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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.

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Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Electroplating

Plating a metal onto a (cathodic) surface by electrolysis.

Optical Activity

The rotation of plane polarized light by one of a pair of optical isomers.

 

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Coulometry

The quantitative application of Faraday's Law to the analysis of materials. The current and time are the usual variables measured.

Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Clay

A class of silicate and aluminosilicate minerals with sheet-like structures that have enormous surface areas that can absorb large amounts of water.