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A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

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Polymerization

The combination of many small molecules to form large molecules.

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Osmotic Pressure

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

Dimer

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

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Percent by Mass

100% times the actual yield divided by theoretical yield.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Saccharate

A compound formed by interaction of sucrose with a metallic oxide, usually lime, and useful in the purification of sugar.

 

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.