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At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

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Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

Cathodic Protection

Protection of a metal (making ir a cathode) against corrosion by attaching it to a sacrifical anode of a more easily oxidized metal.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

xenon hexafluoride

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

Outer Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Octane Number

A number that indicates how smoothly a gasoline burns.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.