Combination of symbols that indicates the chemical composition of a substance.
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Use of diamonds
Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most...
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Gas of rotten eggs
If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.
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Varieties of garnet minerals
The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in...
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Why do copper products change color, and what is the name of the process?
Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.
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What are Compound Microscopes?
Most of the microscopes used today are compound. A compound microscope features two or more lenses. A hollow cylinder called the tube connects the two lenses. The top lens, the one people look through, is called the eyepiece. The bottom lens is known as the objective lens. Below the two lenses is...
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Fractional Precipitation
Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.
Aufbau ('building up') Principle
Describes the order in which electrons fill orbitals in atoms.
Homologous Series
A series of compounds in which each member differs from the next by a specific number and kind of atoms.
Delocalization
Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.
xenon tetrafluoride
A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.
Chemical Periodicity
The variations in properties of elements with their position in the periodic table.
Joule
A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.
Linkage Isomers
Isomers in which a particular ligand bonds to a metal ion through different donor atoms.
Surface Tension
It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.
Amorphous Solid
A noncrystalline solid with no well-defined ordered structure.
