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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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xylic acid

Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Vapor

A gas formed by boiling or evaporating a liquid.

Leclanche Cell

A common type of dry cell.

Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Kinetic-molecular Theory

A theory, that attempts to explain macroscopic observations on gases in microscopic observations on gases in microscopic observations on gases in microscopic or molecular terms.

Vapor Pressure

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

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.

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