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An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

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Basic Salt

A salt containing an ionizable OH group.

Differential Thermometer

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

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Acetic Acid

CA3COOH, clear, colorless liquid, pungent odor. Boiling point 140C, flash point 54C (closed cup), autoignition temperature 38OC.

Free Radical

A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Exothermic

Describes processes that release heat energy.