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The direct solidification of a vapor by cooling, the reverse of sublimation.

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Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Isomers

Different substances that have the same formula.

Bronsted-Lowry Base

A proton acceptor

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Electrophile

Positively charged or electron-deficient.

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.