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A gas formed by boiling or evaporating a liquid.

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Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Dumas Method

A method used to determine the molecular weights of volatile liquids.

Binary Compound

A compound consisting of two elements, may be ionic or covalent.

Specific Rate Constant

An experimentally determined (proportionality) constant, which is different for different reactions and which changes only with temperature, k in the rate-law expression: Rate = k [A] x [B]v.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Atom

The smallest particle of an element.

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Conjugate Acid-base Pair

In Bronsted-Lowry terminology, a reactant and product that differ by a proton, H+.