Refers to the separation of charge between two covalently bonded atoms.
Latest Articles
- 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...
- 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...
- Chemistry of the sky
Chemistry can teach us about the composition of celestial bodies and determine their age.
- Features of the Scanning Tunneling Microscope
The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...
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Precipitate
An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.
xanthene dye
Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.
Band Theory of Metals
Theory that accounts for the bonding and properties of metallic solids.
Group
A vertical column in the periodic table, also called a family.
Born-Haber Cycle
A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)
Saccharic acid
A white, needlelike, crystalline, water-soluble solid or syrup, C6H10O8, usually made by the oxidation of cane sugar, glucose, or starch by nitric acid. Also called "Glucaric acid."
Phase Diagram
Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.
Fluids
Substances that flow freely, gases and liquids.
Crystal Lattice
A pattern of arrangement of particles in a crystal.
Ferromagnetism
The ability of a substance to become permanently magnetized by exposure to an external magnetic field.
