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A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

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Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.

Greenhouse Effect

Trapping of heat at the surface of the earth by carbon dioxide and water vapour in the atmosphere.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Evaporization

Vaporization of a liquid below its boiling point.

Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Electrical Conductivity

Ability to conduct electricity.

Accuracy

How closely a measured value agrees with the correct value.

Capillary

A tube having a very small inside diameter.