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A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

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Periodic Table of Elements

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Supercritical Fluid

A substance at temperature above its critical temperature.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Molality

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

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

xanthene dye

Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.

 

xylic acid

Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.

Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.