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A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

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Phosphoric Acid

H3P04, Colorless liquid or rhombic crystals, decomposes before it will boil. Used mostly in the metal etchant. Used in cleaning operations to remove encrusted surface matter and mineral scale found on metal equipment such as boilers and steam producing equipment. Also used to brighten metals and remove rust.

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.

 

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Specific Gravity

The ratio of the density of a substance to the density of water.

Electrophile

Positively charged or electron-deficient.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.