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

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Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Emission Spectrum

Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.

 

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Solute

The dispersed (dissolved) phase of a solution.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.

 

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.