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Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

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Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Line Spectrum

An atomic emission or absorption spectrum.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Graham's Law

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

yttrium

A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."

Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Hydride

A binary compound of hydrogen.