Callahan County, TX Real Estate & Homes for Sale Homes for Sale in Callahan County, TX have a median listing price of $128,995 and a price per square foot of $75. There are 103 active homes for sale in Callahan County, Texas, which spend an average of 73 days on the market. Some of the hottest neighborhoods near Callahan County, TX are Tanglewood East, Chimney Rock Area, Far Southside, River Oaks-Brookhollow. You may also be interested in homes for sale in popular zip codes like 79602, 79601, or in neighboring cities, such as Abilene, Clyde, Baird, Cisco, Coleman.
hydrogen bond. A chemical bond in which a hydrogen atom that is already bonded to an atom in a molecule forms a second bond with another atom, either in the same molecule or in a different one. The second atom is usually of a type that strongly attracts electrons, such as nitrogen or oxygen.
Properties of hydrogen bonds. How are they formed? a hydrogen bond is formed when a charged part of a molecule having polar covalent bonds forms an electrostatic (charge, as in positive attracted to negative) interaction with a substance of opposite charge. Molecules that have nonpolar covalent bonds donot form hydrogen bonds. Strenght. Hydrogen bonds are classified as weak bonds because they are easily and rapidly formed and broken under normal biological conditions. What classes of compounds can form hydrogen bonds? Under the right environmental conditions, any compound that has polar covalent bonds can form hydrogen bonds. Click here to see some different kinds of hydrogen bonds. Importance. Hydrogen bonds are extremely important in biological systems. Thier presence explains many of the properties of water.