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Combination of symbols that indicates the chemical composition of a substance.

 

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Tyndall Effect

The scattering of light by colloidal particles.

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."

 

Ionic Compounds

Compounds containing predominantly ionic bonding.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Third Law of Thermodynamics

The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.

Amino Acid

Compound containing both an amino and a carboxylic acid group.The --NH2 group.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.