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Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

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Octane Number

A number that indicates how smoothly a gasoline burns.

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Avogadro's Law

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

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Chain Termination Step

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

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Dispersing Medium

The solvent-like phase in a colloid.

Osmotic Pressure

The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.