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A substance whose aqueous solutions do not conduct electricity.

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Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Rate of Reaction

Change in the concentration of a reactant or product per unit time.

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.

Coulometry

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

Corrosion

Oxidation of metals in the presence of air and moisture.