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The solid form of mixed uranium oxide, which is produced from uranium ore in the uranium recovery (milling) process.

The material is a mixture of uranium oxides, which can vary in proportion and color from yellow to orange to dark green (blackish) depending on the temperature at which the material is dried (which affects the level of hydration and impurities), with higher drying temperatures producing a darker and less soluble material.

Yellowcake was commonly referred to as U3O8, because that chemical compound historically comprised the majority of the yellowcake produced by uranium recovery facilities utilizing conventional milling methods.

Most modern uranium recovery facilities utilize in situ recovery methods and produce a yellowish compound comprised mostly of uranyl peroxide dihydrate. This material is then transported to a uranium conversion facility, where it is transformed into uranium hexafluoride (UF6), in preparation for fabricating fuel for nuclear reactors.

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Covalent Compounds

Compounds containing predominantly covalent bonds.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Polydentate

Refers to ligands with more than one donor atom.

Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Tetrahedral

A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Mass Action Expression

For a reversible reaction, aA + bB cC + dD the product of the concentrations of the products (species on the right), each raised to the power that corresponds to its coefficient in the balanced chemical equation, divided by the product of the concentrations of reactants (species on the left), each raised to the power that corresponds to its coefficient in the balanced chemical equation. At equilibrium the mass action expression is equal to K, at other times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K.