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Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Every chemical element has absorption lines at certain wavelengths corresponding to the differences between the energy levels of its atomic orbitals.

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Reducing Agent

The substance that reduces another substance and is oxidized.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Primary Voltaic Cells

Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.

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.

 

Crystal Field Stabilization Energy

A measure of the net energy of stabilization gained by a metal ion's nonbonding d electrons as a result of complex formation.

Chemical Hygiene Plan (CHP)

A written program developed and implemented by an employer designating proceedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals usid in that particular workplace.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Saccharic

of or derived from saccharin or a saccharine substance.