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Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

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Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Specific Gravity

The ratio of the density of a substance to the density of water.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

Galvanizing

Placing a thin layer of zinc on a ferrous material to protect the underlying surface from corrosion.

 

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Excited State

Any state other than the ground state of an atom or molecule.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.