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A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

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Temperature

A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

Standard Electrode Potential

By convention, potential, Eo, of a half-reaction as a reduction relative to the standard hydrogen electrode when all species are present at unit activity.

 

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Designated area

An area that may be used for work with carcinogens, reproductive toxins, or substances that have a high degree of acute toxicity. A designated area may be the entire laboratory, an area of a laboratory, or a device such as a laboratory hood.

Titration

A Procedure in which one solution is added to another solution until the chemical reaction between the two solutes is complete, the concentration of one solution is known and that of the other is unknown.

 

Complex Ions

Ions resulting from the formation of coordinate covalent bonds between simple ions and other ions or molecules.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Ore

A natural deposit containing a mineral of an element to be extracted.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Oxide

A binary compound of oxygen.

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Mass Deficiency

The amount of matter that would be converted into energy if an atom were formed from constituent particles.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Dipole

Refers to the separation of charge between two covalently bonded atoms.

Equilibrium Constant

A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

Crystalline Solid

A solid characterized by a regular, ordered arrangement of particles.

Percent Purity

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

Sulfuric Acid

H2SO4: colorless, oily liquid, boiling point 330C. A 96 percent solution is used in the laboratory.

Fire Hazard: This is a very powerful, acidic oxidizer which can Ignite or even explode on contact with many materials, i.e. acetic acid ,acetone+ HNOs, alcohols, + H202, NH4OH, HCL, NaOH, and others.

Sulfuric acid has a wide range of uses and plays a part in the production of nearly all manufactured goods.