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Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

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Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Fuel Cells

Voltaic cells in which the reactants (usually gases) are supplied continuously.
A voltaic cell that converts the chemical energy of a fuel and an oxidizing agent directly into electriacl energy on a continuous basis.

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Anode

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

The most expensive metal in the world

Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Free Energy Change

The indicator of spontaneity of a process at constnt T and P. If delta-G is negative, the process is spontaneous.

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.