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The direct solidification of a vapor by cooling, the reverse of sublimation.

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Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Tetrahedral

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

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Nonelectrolyte

A substance whose aqueous solutions do not conduct electricity.

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Insulator

Poor electric and heat conductor.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.