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Covalent bond in which electron density is symmetrically distributed.

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Third Law of Thermodynamics

The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Absorption Spectrum

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.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Silicones

Polymeric organosilicon compounds, contain individual or cross-linked Si-O chains or rings in which some oxygens of SiO4 tetrahedra are replaced by other groups.