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Negative logarithm of the concentration (mol/L) of the H3O+[H+] ion, scale is commonly used over a range 0 to 14.

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Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Positron

A Nuclear particle with the mass of an electron but opposite charge.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Overlap

The interaction of orbitals on different atoms in the same region of space.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Solvolysis

The reaction of a substance with the solvent in which it is dissolved.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Graham's Law

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

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."