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Adverse health effects resulting from skin exposure ot a substance.

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Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Amine

Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

Hydration

Reaction of a substance with water.

Bonding Orbital

A molecular orbit lower in energy than any of the atomic orbitals from which it is derived, lends stability to a molecule or ion when populated with electron.

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.