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At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.

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Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Heterogeneous Mixture

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

Octane Number

A number that indicates how smoothly a gasoline burns.

Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Potential Energy

Energy that matter possesses by virtue of its position, condition or composition.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.