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A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Latest Articles

  • 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.

  • 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...

  • 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...

  • Chemistry of the sky

    Chemistry can teach us about the composition of celestial bodies and determine their age.

  • 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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Condensation

Liquefaction of vapor.

Polydentate

Refers to ligands with more than one donor atom.

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Coke

An impure form of carbon obtained by destructive distillation of coal or petroleum.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.