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A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

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Chemical Change

A change in which one or more new substances are formed.

Homonuclear

Consisting of only one element.

Nickel-cadmium cell (Nicad battery)

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

Coordination Number

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

Ideal Solution

A solution that obeys Raoult's Law exactly.

Control Rods

Rods of materials such as cadmium or boron steel that act as neutron obsorbers (not merely moderaters) used in nuclear reactors to control neutron fluxes and therfore rates of fission.

Lanthanides

Elements 58 to 71 (after lanthanum).

Ionic Compounds

Compounds containing predominantly ionic bonding.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Overlap

The interaction of orbitals on different atoms in the same region of space.