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Pair of electrons involved in a covalent bond.

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Insoluble Compound

A very slightly soluble compound.

Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Distillate

The material in a distillation apparatus that is collected in the receiver.

 

Ore

A natural deposit containing a mineral of an element to be extracted.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Electron Deficient Compounds

Compounds that contain at least one atom (other than H) that shares fewer than eight electrons.

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.