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Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

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Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Equivalent Weight

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.

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

Extensive Property

A property that depends upon the amount of material in a sample.

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

Electrode Potentials

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

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Lewis Base

Any species that can make available a share in an electron pair.

Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).