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Equilibrium constant for the ionization of a weak electrolyte.

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Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Square Planar

A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.

Autoionization

An ionization reaction between identical molecules.

Nuclear Fission

The process in which a heavy nucleus splits into nuclei of intermediate masses and one or more protons are emitted.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Formal Charge

A method of counting electrons in a covalently bonded molecule or ion, counts bonding electrons as though they were equally shared between the two atoms.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Distilland

The material in a distillation apparatus that is to be distilled.