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A Lewis base in a coordination compound.

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Tyndall Effect

The scattering of light by colloidal particles.

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

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.

Bond Energy

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase).The amount of energy necessary to break one mole of bonds in a substance, dissociating the sustance in the gaseous state into atoms of its elements in the gaseous state.

Lewis Acid

Any species that can accept a share in an electron pair.

Insulator

Poor electric and heat conductor.

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.