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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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Adhesive Forces

Forces of attraction between a liquid and another surface.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Dispersed Phase

The solute-like species in a colloid.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Salicylate

A salt or ester of salicylic acid.

Heat of Fusion

The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

Fossil Fuels

Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale.  For further information see Fuel Chemistry

Basic Salt

A salt containing an ionizable OH group.