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Metal with low ionization energy that loses electrons readily to form cations.

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Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Physical Change

A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.

 

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Saturated Solution

Solution in which no more solute will dissolve.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Heterogeneous Mixture

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

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Geiger counter

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

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.

Miscibility

The ability of one liquid to mix with (dissolve in) another liquid.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Polymerization

The combination of many small molecules to form large molecules.

Saccharic

of or derived from saccharin or a saccharine substance.

 

Precipitate

An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.

Dubnium

Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.