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A noncrystalline solid with no well-defined ordered structure.

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Allotropes

Different forms of the same element in the same physical state.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Supercritical Fluid

A substance at temperature above its critical temperature.

Polyene

A compound that contains more than one double bond per molecule.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Corrosion

Oxidation of metals in the presence of air and moisture.

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Heteronuclear

Consisting of different elements.