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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.

Every chemical element has absorption lines at certain wavelengths corresponding to the differences between the energy levels of its atomic orbitals.

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Dispersed Phase

The solute-like species in a colloid.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Rate of Reaction

Change in the concentration of a reactant or product per unit time.

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.

Degenerate

Of the same energy.

Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.