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

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Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

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.

 

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Reactants

Substances consumed in a chemical reaction.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Percent by Mass

100% times the actual yield divided by theoretical yield.

Absorption Spectrum

Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Double Salt

Solid consisting of two co-crystallized salts.

 

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.