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The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

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Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

How to make crystal glass

From history we know that the idea of creating crystal belongs to the British: they were the first to add lead oxides to the charge material, and as a result got glass with unusual “voice”, transparency and sparkling faces. Classical crystal contains 24% of lead oxide, but there are products with a higher content of up to 30%.

Salinometer

An instrument for measuring the amount of salt in a solution. Also,"salimeter, salometer."

Percent Purity

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

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Entropy

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

Hydration

Reaction of a substance with water.