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The energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m is mass, and c is the speed of light.

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Allotropes

Different forms of the same element in the same physical state.

Manometer

A two-armed barometer.

Aromatic Hydrocarbons

Benzene and its derivatives.

Combustible

Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Percent Composition

The mass percent of each element in a compound.

Associated Ions

Short-lived species formed by the collision of dissolved ions of opposite charges.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.