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Two methyl groups of the same carbon atom.

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Coulometry

The quantitative application of Faraday's Law to the analysis of materials. The current and time are the usual variables measured.

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.

Voltaic Cells

Electrochemical cells in which spontaneous chemical reactions produce electricity, also called galvanic cells.

 

Standard Reaction

A reaction in which the numbers of moles of reactants shown in the balanced equation, all in their standard states, are completely converted to the numbers of moles of products shown in the balanced equation, also sall at their standard state.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Hydrate

A solid compound that contains a definite percentage of bound water.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.