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A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.

 

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Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

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.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Isoelectric

Having the same electronic configurations.

Solute

The dispersed (dissolved) phase of a solution.

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Particulate Matter

Fine divided solid particles suspended in polluted air.

yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

Solvation

The process by which solvent molecules surround and interact with solute ions or molecules.