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

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Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Homonuclear

Consisting of only one element.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

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.

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Osmosis

The process by which solvent molecules pass through a semipermable membrane from a dilute solution into a more concentrated solution.

 

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.