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An oxidizing or reducing agent, who's mass gains (oxidizing agents) or loses (reducing agents) 6.022 x 1023 electrons in a redox reaction.
The mass of an acid or base that furnishes or reacts with 6.022 x 1023 H3O+ or OH- ions.

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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.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Charle's Law

At constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.

Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Inhibitory Catalyst

An inhibitor, a catalyst that decreases the rate of reaction.