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Involves a change in the composition of a nucleus and can evolve or absorb an extraordinarily large amount of energy.

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Temperature

A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Distilland

The material in a distillation apparatus that is to be distilled.

Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Dumas Method

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

Foam

Colloidal suspension of a gas in a liquid.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.