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The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

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Ligand

A Lewis base in a coordination compound.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Solvolysis

The reaction of a substance with the solvent in which it is dissolved.

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Lewis Acid

Any species that can accept a share in an electron pair.

Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Solubility Product Principle

The solubility product constant expression for a slightly soluble compound is the product of the concentrations of the constituent ions, each raised to the power that corresponds to the number of ions in one formula unit.