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At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.

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Polarimeter

A device used to measure optical activity.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Ionic Compounds

Compounds containing predominantly ionic bonding.

Enzyme

A protein that acts as a catalyst in biological systems.

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.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Buffer Solution

Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Isomers

Different substances that have the same formula.