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Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

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Graham's Law

The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Percent Purity

The percent of a specified compound or element in an impure sample.

Acyl Group

Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.

Octahedral

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

Saccharic acid

A white, needlelike, crystalline, water-soluble solid or syrup, C6H10O8, usually made by the oxidation of cane sugar, glucose, or starch by nitric acid. Also called "Glucaric acid."

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.