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Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

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Salinometer

An instrument for measuring the amount of salt in a solution. Also,"salimeter, salometer."

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.

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

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.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Daughter Nuclide

Nuclide that is produced in a nuclear decay.

 

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Moderator

A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.