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Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

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Adsorption

Adhesion of a species onto the surfaces of particles.

Nitrogenases

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.

 

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Aldehyde

Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H

 

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Allotropes

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