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The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

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Compressed Gas

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

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Supercritical Fluid

A substance at temperature above its critical temperature.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Allotropes

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

High Spin Complex

Crystal field designation for an outer orbital complex, all t2g and eg orbitals are singly occupied before any pairing occurs.

Metallic Bonding

Bonding within metals due to the electrical attraction of positively charges metal ions for mobile electrons that belong to the crystal as a whole.