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

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Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.

Halogens

Group VIIA elements: F, Cl, Br, I

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Mechanism

The sequence of steps by which reactants are converted into products.

Manometer

A two-armed barometer.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

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.

Group

A vertical column in the periodic table, also called a family.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.