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Topic: Chemical bond

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  Chemical bond - Wikipedia, the free encyclopedia
A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons or electrostatic forces.
Weak chemical bonds are classically explained to be effects of polarity, or the lack of it, of strong bonds.
The type of strong bond depends on the difference in electronegativity and the distribution of the electron path to the atoms that are bonded.
en.wikipedia.org /wiki/Chemical_bond   (1882 words)

 Kids.net.au - Encyclopedia Chemical bond -   (Site not responding. Last check: 2007-09-20)
In chemistry and allied sciences, a chemical bond is the force which holds atoms together in molecules or crystals.
In all types of bonding, the electronic configuration of the molecule or substance (in the case of extended array structures, such as found in crystals).
The types of bonding are differentiated by the extent to which electron density is localized or delocalized among the atoms of the substance.
www.kidsseek.com /encyclopedia-wiki/ch/Chemical_bond   (358 words)

 Chemical Bonds
Ionic bond: bond in which one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other.
Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms, in contrast to the transfer of electrons in ionic bonds.
Hydrogen bonding differs from other uses of the word "bond" since it is a force of attraction between a hydrogen atom in one molecule and a small atom of high electronegativity in another molecule.
hyperphysics.phy-astr.gsu.edu /hbase/chemical/bond.html   (698 words)

 Chemical bonding: introduction
Chemical bonding connotes the existence of an aggregate (assembly) of atoms that is sufficiently stable to possess a characteristic structure and composition.
Chemical bonds, of course, cannot be observed directly; the best we can do is to carry out experiments on substances containing the appropriate pair of atoms, and then try to make inferences about the nature of the bonding force between them.
Bond lengths depend mainly on the sizes of the atoms, and secondarily on the bond strengths, the stronger bonds tending to be shorter.
www.chem1.com /acad/webtext/chembond/cb01.html   (2737 words)

 Fundamental Chemical Bond   (Site not responding. Last check: 2007-09-20)
Molecules are collections of atoms that are held together by chemical bonds, so the first point is: chemical involve more than one atom, sometimes of the same atomic type and in other cases atoms of different types.
The chemical bond is some sort of "sharing" of the electrons between the atoms forming the molecule.
Chemical bonds are the forces that hold atoms together.
www.newton.dep.anl.gov /askasci/chem03/chem03121.htm   (432 words)

 chemical bond on Encyclopedia.com
Bond package is a good place for chemical cleanup project ; Clearly, the cleanup is not something th...
CHEMICAL BOND [chemical bond] mechanism whereby atoms combine to form molecules.
Unlike the ionic and covalent bonds, which are found in a great variety of molecules, the metallic and hydrogen bonds are highly specialized.
www.encyclopedia.com /html/c1/chem-bnd.asp   (984 words)

 Chemical Bonding
A chemical bond is a mechanism that is used to chemically combine atoms.
Bond Length is the average distance between the centers of two bonded atoms.
Bond Order is the term used to distinguish between the number of bonds that exist between two atoms.
www.bcpl.net /~kdrews/bonding/bonding.html   (798 words)

 Chemical bond: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-09-20)
The valence bond theory considers the overlap of the atomic orbitals of the participation atoms to form a chemical bond....
Bond dissociation is an endothermic process, and energy that is necessary to the process is called bond dissociation energy....
Chemical equilibrium is the state in which a chemical reaction proceeds at the same rate as its reverse reaction; the rates of the forward and reverse reactions...
www.absoluteastronomy.com /encyclopedia/c/ch/chemical_bond.htm   (1370 words)

 Chemical Sciences: Bond Enthalpies (Bond Energies)
Bond enthalpies are the enthalpy changes which result when one mole of bonds of a particular type, on average, are formed from isolated gasesous atoms.
Bond enthalpies, which are sometimes (erroneously) called bond energies, are found to be very similar from one organic compound to another.
Calculate the bond enthalpy of the hydrogen-fluorine bond in HF and compare it to the bond enthalpy of the fluorine-fluorine bond in F2.
www.psigate.ac.uk /newsite/reference/plambeck/chem2/p01083.htm   (919 words)

 Chemical Bond Data
A chemical bond forms when it is energetically favorable, i.e., when the energy of the bonded atoms is less than the energies of the separated atoms.
Electronegativity is a measure of the ability of an atom in a molecule to draw bonding electrons to itself.
An important application of electronegativity is in the prediction of the polarity of a chemical bond.
hyperphysics.phy-astr.gsu.edu /hbase/chemical/bondd.html   (569 words)

 Conformational isomerism - Wikipedia, the free encyclopedia
Conformational isomerism is a form of isomerism and describes the phenomenon of molecules with the same structural formula having different chemical conformations or conformers due to atoms rotating about a bond.
This will result in a racemic mixture of conformations that may or may not have different reactivities in situations such as enzymatic reactions in which molecular shape is usually a key factor of operation.
Conformational isomerism only occurs around single bonds as a result of the requirement of breaking one or more pi bonds to rotate substituents about a sigma bond axis in double and triple bonded atoms.
en.wikipedia.org /wiki/Chemical_conformation   (471 words)

 Chemical bond
The larger is the difference in electro negativity of the bonded atoms, the higher is polarity of the bond.
Chemical bond between ions formed by means of electrostatic attraction is called ionic bond.
Hydrogen bond is a bond formed by a positively charged hydrogen atom belonging to one molecule and a negatively charged atom of another molecule.
www.informika.ru /text/database/chemy/Enu/Data/Ch1_4.html   (467 words)

 The Chemical Bond - Molecular Geometry
The valence bond theory of the water molecule describes the two O—H bonds as resulting from the overlap of the H 1s orbitals with the two half-filled 2p orbitals of the oxygen atom.
By assuming that the most stable bond results when the two nuclei joined by the bond lie along the axis defined by the orbitals and considering the bonds to a first approximation to be independent of one another, we can predict the geometries of molecules.
bond whose density is concentrated in the x-y plane, with a node in the x-z plane.
www.chemistry.mcmaster.ca /esam/Chapter_6/section_4.html   (2265 words)

 Bond Energy
For any particular chemical bond, say the covalent bond between hydrogen and oxygen, the amount of energy it takes to break that bond is exactly the same as the amount of energy released when the bond is formed.
The energies of bonds between atoms of substantially different electronegativities tend to be high, e.g., the 110 kcal of the H-O bond.
Another important example is the bonds between oxygen and carbon atoms in carbon dioxide, CO The carbon atom shares two pairs of electrons with each of the oxygen atoms, and each of these double bonds has a bond energy of 187 kcal (or about 93 kcal for each shared pair of electrons).
users.rcn.com /jkimball.ma.ultranet/BiologyPages/B/BondEnergy.html   (1332 words)

 Chemical Bonding
The type of bonding that occurs when a nonmetal accepts an electron from a metal is referred to as ionic bonding and the bond is called an ionic bond.
We explain the reactions and bonding that occurs in organic molecules by monitoring the valence electrons associated with the atoms.
Bond strength is defined as the amount of energy needed to homolytically break a bond (each of the nuclei takes one of the two electrons from the bond).
chemistry.armstrong.edu /P1/Bonding.html   (804 words)

The bond dissociation energy is the amount of energy required to break a bond between two atoms.
Chemicals which are not consumed in a reaction, but, which speed up the reaction rate are called catalysts.
Chemical vapor deposition (CVD) is a method for growing solids in which a gaseous precursor (containing fragments of the desired solid) is decomposed and deposited onto a desired surface.
www.chem.wisc.edu /~newtrad/CurrRef/Glossary/Glossary.html   (3551 words)

 ChemTeam: G.N. Lewis & The Covalent Bond
Like a double bond it may break one bond, producing two odd carbon atoms, but it may also break in a way in which the double bond cannot, to leave a single bond and two carbon atoms (bivalent), each of which has a pair of electrons which is not bound to any other atom.
Thus two carbon atoms with a single bond strive to keep their kernels as far part as possible, and this condition is met when the adjoining corners of the two tetrahedra lie in the line joining the centers of the tetrahedra.
When a single bond changes to a multiple bond and the two atomic shells have two pairs of electrons in common, the kernels are forced nearer together and the mutual repulsion of these kernels greatly weakens the constraints at the points of junction.
dbhs.wvusd.k12.ca.us /webdocs/Chem-History/Lewis-1916/Lewis-1916.html   (6968 words)

 Chemical Bonding
The bond lengths of the halogen molecules are used to determine an approximate radius for chemical (covalent) bonding of the halogen atoms.
Since we are treating the chemical bond as largely depending only upon the nature of the two atoms in contact through the bond, perhaps we can use this idea to determine the overall stability of a molecule by adding up its bond energies.
This assumes that all chemical bonds between the same pair of atoms of the same type are approximately equal in properties.
itl.chem.ufl.edu /2045/lectures/lec_13.html   (1008 words)

 Chemical bond - Wikipedia
chemistry and allied sciences, a chemical bond is the force which holds atoms together in molecules or
In the case of ionic bonding, electrons are more tightly associated with individual atoms, with net charges being assigned to discrete constituent atoms throughout the substance, with the nature of the interatomic (or more appropriately) interionic forces largely characterized by
In contrast, the electron density distributions within covalent bonds are not so readily assigned to individual atoms, but are instead delocalized across the molecule in structures sometimes described as molecular orbitals, which may have more directed,
wikipedia.findthelinks.com /ch/Chemical_bond.html   (266 words)

 Chemical Bonding   (Site not responding. Last check: 2007-09-20)
The chemical bond in general is an electrical attraction between two atoms.
Bonded atoms are continually in motion as they are attracted to each other only to get too close and the repulsive interactions begin to push the atoms away from each other until the attractive interactions, once again, take control, pulling the atoms back together.
Since the bond is in continual motion, the bond length that is measured represents the average bond length (distance between the nuclei of the bonded atoms)
members.aol.com /profchm/bonding.html   (328 words)

 Chemical bond -   (Site not responding. Last check: 2007-09-20)
A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.
Ionic bonding is type of electrostatic bond between atoms which have an electronegativity difference of over 1.6 (this limit is a convention).
There are four basic types of bonds that two or more (otherwise none-associated) molecules, ions or atoms can form between themselves.
psychcentral.com /psypsych/Chemical_bond   (1878 words)

 3. Types of Chemical Bonding [Beyond Books - Introduction to Chemistry Concepts]
The type of chemical bond that occurs in a molecule or substance in part defines its properties.
The bonds that hold the carbon and hydrogen atoms in rubber together, on the other hand, are not ionic but covalent.
Essential to understanding all types of chemical bonding is realizing that all bonds use electron "glue." Every substance is made up of atoms, and all atoms are surrounded by the charged particles called electrons.
www.beyondbooks.com /psc92/3.asp   (719 words)

 The Chemical Bond
Bonding with four hydrogen atoms -- each with one 1s-orbital, containing one electron -- could be viewed as an overlap of the four orbitals of the outer electronshell of Carbon with the four times one = four orbitals of the four hydrogen atoms.
Bonds consist of electrons, and because like electrical charges repel each other, these bonds try to be as far away as possible from each other.
The four bonds (in Methane) will diverge maximally from each other, and this means that the complete spatial structure of Methane should be a regular tetrahedron with a carbon atom in the center and the four hydrogen atoms at the vertices of the tetrahedron.
metafysica.nl /chemical_bond.html   (10048 words)

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