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Fine divided solid particles suspended in polluted air.

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Effective Collisons

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

 

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Percent Composition

The mass percent of each element in a compound.

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.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.

Free Energy, Gibbs Free Energy

The thermodynamic state function of a system that indicates the amount of energy available for the system to do useful work at constant T and P.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.