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An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.

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Element

A substance that cannot be decomposed into simpler substances by chemical means.

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Valence Bond Theory

Assumes that covalent bonds are formed when atomic orbitals on different atoms overlap and the electrons are shared.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Water Equivalent

The amount of water that would absorb the same amount of heat as the calorimeter per degree temperature increase.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.