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The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

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Disproportionation Reactions

Redox reactions in which the oxidizing agent and the reducing agent are the same species.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

xenon hexafluoride

A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Solution

Homogeneous mixture of two or more substances.

Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Exothermicity

The release of heat by a system as a process occurs.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Evaporization

Vaporization of a liquid below its boiling point.