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Topic: Bond dissociation energy

	Sn2
		The energy required to cleave a bond homolytically is known as the bond dissociation energy.
		The bond dissociation energy of 101 kcal/mol is typical of a primary C-H bond in an alkane.
		Assuming that the C-Mg bond is ionic (a false assumption), draw the structure of the carbanion corresponding to the Grignard reagent shown in Equation 4.
	www.usm.maine.edu /~newton/Chy251_253/Lectures/DelocalizedBonding/DelocalizationSurvey.html (1934 words)

	Bond dissociation energy - Wikipedia, the free encyclopedia
		For instance, the bond dissociation energy for one of the C-H bonds in ethane (C
		The bond dissociation energy is usually different from the bond energy, which is calculated from the sum of the bond dissociation energies of all bonds in a molecule.
		The bond energy of the O-H bonds in water is 458.9 kJ mol
	en.wikipedia.org /wiki/Bond_dissociation_energy (305 words)

	Chemical Reactivity
		The traditional unit of heat energy used by organic chemists is the calorie, defined as the heat neeeded to raise the temperature of 1 gram of water 1º C (from 14.5 to 15.5º C).
		Energy is required to break bonds, and since different bonds have different bond dissociation energies, there is often a significant overall energy change in the course of a reaction.
		Fortunately, it is possible to determine the bond dissociation energy of diatomic elements and compounds with precision by non-thermodynamic methods, and together with thermodynamic data such information permits a table of average bond energies to be assembled.
	www.cem.msu.edu /~reusch/VirtualText/energy1.htm (3883 words)

	Re: Bond dissociation energy (Site not responding. Last check: 2007-10-19)
		Bond dissociation energy is a measure of the stability of a molecule.
		This is the enthalpy change required to break a particular bond in one mole of gaserous molecules.
		Also the bond energies are useful in predicting the enthalpy of the reaction, the total number of bonds broken and formed in the reaction and energy changes.
	vclass.mtsac.edu:920 /chem1a/_disc9/0000004a.htm (119 words)

	Bond Lengths and Energies (Site not responding. Last check: 2007-10-19)
		The bond energy is essentially the average enthalpy change for a gas reaction to break all the similar bonds.
		Bond energy is a measure of the strength of a chemical bond.
		Bonds between the same type of atom are covalent bonds, and bonds between atoms when their electronegativity differs by a little (say 0.7) are also predominant covalent in character.
	www.science.uwaterloo.ca /~cchieh/cact/c120/bondel.html (854 words)

	Heat Changes During Chemical Reactions
		The energy needed to break a bond is called the bond-dissociation energy.
		When the energy needed to break bonds is less than the energy produced by the bonds formed the reaction will give off energy.
		This means the amount of energy that exists today is essentially the same amount of energy that existed thousands and millions of years ago.
	www.800mainstreet.com /7/0007-001-bond_changes.html (540 words)

	Dissociation Summary
		Dissociation may be accomplished by the addition of energy, as in the case of gaseous molecules dissociated by heat; or by the action of a solvent on a polar compound (i.e., electrolytic decomposition).
		Dissociation is a psychological state or condition in which certain thoughts, emotions, sensations, or memories are separated from the rest of the psyche.
		Dissociation most often makes the news with regards to soldiers' responses to wartime stress, rape victims with amnesia for details, and in occasional criminal trials where the question of whether a person with Dissociative Identity Disorder (DID) can be responsible for his or her actions.
	www.bookrags.com /Dissociation (1797 words)

	Problems (Site not responding. Last check: 2007-10-19)
		Although the energy of the hydrogen-bond is small it has a significant effect on the amount of energy that is required to melt ice or boil water.
		The bond dissociation energy represents the energy transferred to the molecule from its surroundings and it thus has a positive value.
		The amount of energy supplied to break a chemical bond must be equal to the amount of energy necessary to form the bond.
	chemistry.boisestate.edu /rbanks/inorganic/energytutorial.htm (1440 words)

	Glossary
		On an energy diagram, this is the difference in energy between the reactants and the transition state.
		The bond dissociation energy is the amount of energy required to break a bond between two atoms.
		The wavelength is inversely proportional to its energy.
	www.chem.wisc.edu /~newtrad/CurrRef/Glossary/Glossary.html (3551 words)

	Strengths of Covalent Bonds (Site not responding. Last check: 2007-10-19)
		The stability of a molecule is a function of the strength of the covalent bonds holding the atoms together.
		The bond energy for a given bond is influenced by the rest of the molecule.
		However, this is a relatively small effect (suggesting that bonding electrons are localized between the bonding atoms).
	wine1.sb.fsu.edu /chm1045/notes/Bonding/Strength/Bond09.htm (320 words)

	bond/pauli def
		The Pauling scale is based on bonding properties, and it is useful for predicting the polarity of covalent bonds.
		The amount of energy (per mole)that is given off when a bond is formed (or the amount that must be put in to break the bond) is called the bond dissociation energy.
		Even if two of the bonds are broken, as in the complex on the right, the remaining two bonds will facilitate the re-formation of the broken ones.
	www.campbell.edu /faculty/nemecz/323_lect/bonds/bonds_chapter.html (826 words)

	Calculation of the Dissociation Energy
		Dissociation energy is the change in energy (usually expressed in kcal per mole) at absolute zero temperature in the ideal gas state for the reaction
		Note that dissociation energy is slightly different from bond energy, which is defined as the standard enthalpy change at 25º C for the ideal gas reaction given above.
		This is the energy in natural units as would be observed in the time-space region.
	www.reciprocalsystem.com /rs/satz/diatom.htm (761 words)

	Duran: Chapter Eleven Bond Energies / Metallic & Itermolecular Bonds (Site not responding. Last check: 2007-10-19)
		Energy must be absorbed to break the bond apart.
		The bond energy is the amount of energy necessary to break one mole of covalent bonds into isolated gaseous species, it is sometimes called the bond dissociation energy or bond enthalpy.
		As the exact bond energy of a given bond varies somewhat with the species that are linked to the other side of the central atom, average bond energies are often quoted.
	www.chem.ufl.edu /~chm2040/Notes/Chapter_11/bond.html (175 words)

	Chemical bonding: introduction
		A chemical bond is so often represented as a line drawn between atom symbols or a stick connecting two balls in a plastic molecular model that we sometimes tend to think of chemical bonds as “things”.
		Chemical bonding connotes the existence of an aggregate (assembly) of atoms that is sufficiently stable to possess a characteristic structure and composition.
		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)

	Alkane Reactivity
		In our previous discussion of bond energy we assumed average values for all bonds of a given kind, but now we see that this is not strictly true.
		In the case of carbon-hydrogen bonds, there are significant differences, and the specific dissociation energies (energy required to break a bond homolytically) for various kinds of C-H bonds have been measured.
		The hydrogens bonded to the aromatic ring (referred to as phenyl hydrogens above) have relatively high bond dissociation energies and are not substituted.
	www.cem.msu.edu /~reusch/VirtualText/funcrx1.htm (1653 words)

	bk4 (Site not responding. Last check: 2007-10-19)
		Formation of a covalent bond with these electrons would be exothermic by -80- -100 kcal (a stabilization), so it is desirable to search further for a more acceptable answer in which nmore covalent bonds to carbon are present..
		In (22), the curved arrow signifies that a covalent bond between C and F is broken and the electrons move onto fluorine and become a lone pair.
		However, "valence bond" representations (chemical structures) are retained in textbooks for the sake of simplicity.
	www.chem.unl.edu /cak/bk4.htm (4404 words)

	[No title]
		Introduction The objective of this experiment was to determine the bond dissociation energy of the ketone ring in cyclopropyl phenyl ketone.
		The bonds formed are the primary carbon to a hydrogen and another carbon to a hydrogen, but not necessarily a primary carbon.
		When determining the heat of combustion of the cyclopropyl phenyl ketone, this is the first step in determining the heat of reaction for the bond dissociation of the ketone ring.
	filebox.vt.edu /j/jhausman/JRH.doc (949 words)

	Re: Bond dissociation energy (Site not responding. Last check: 2007-10-19)
		Bond dissociation energy, also known as bond energy is the enthalpy change required to break a bond.
		- the bond energy for a given bond is influenced by the rest of the molecules.
		Notice that although the reaction turned out to be exothermic, all of the numbers used were positive numbers, the bigger sum was the bond energies made which made the equation negative.
	vclass.mtsac.edu:920 /chem1a/_disc9/0000004c.htm (230 words)

	Re: Energy required to disassociate the water molecule: photon and/or temp
		Simply put, the energy required to break up a water molecule is the bond dissociation energy of the H2O molecule.
		Having said this, this is the bare minimum energy required, according to the bond dissociation energy, to break up the molecule to the atoms.
		The extra energy is presumably a consequence of the real shape of the potential energy surface - that is, taking into account that the bond dissociation energy would just be enough to break the bonds.
	www.madsci.org /posts/archives/Mar2003/1048779104.Ph.r.html (562 words)

	Chap1
		The term “Bond Energy” is used to describe the average energy of all the bonds in a molecule.
		The Bond Energy for the breaking of all four C-H bonds of methane is simply the average of the bond dissociation energies.
		The bond polarity is measured as a vector quantity, the dipole moment, which depends on the two net charges at the ends of the given bond and the distance of separation.
	web.njit.edu /~skawinsk/chem243/save/Chap1.htm (4431 words)

	IB Chemistry glossary of terms and definitions
		The bond enthalpy is the average value of the bond dissociation enthalpy (see above) for the same kinds of bonds, but in a number of different compounds.
		A term that is used loosely to indicate bond enthalpies: the larger the bond enthalpy, the greater the strength of the bond.
		It commonly describes a single electron pair (bonding or non-bonding), or the two or three electron pairs found in double or triple bonds respectively, which are treated as a single centre for the purposes of the theory.
	ibchem.com /root_htm/defn/IBgloss.htm (4871 words)

	chemical change
		Bond dissociation energy is the measure of how strong chemical bonds are.
		It is the amount of energy required to break a chemical bond.
		Bonds with low bond dissociation energy are easier to break than bonds with high dissociation energy.
	www.geocities.com /j31645/19.html (821 words)

	High Temperature Corrosion Preprint
		If this ensemble of different bonds were represented in a bulk material of small molecules, there would be a distribution of bonds broken: thermal energy would be distributed, with some molecules having enough energy to break some of the stronger bonds, and some only having enough energy to break the weakest bond.
		In a small molecule in vacuum, as a bond dissociates the energy will rise to level off and approach a limit that is equal to the sum of the energies of the separated free radicals.
		The lowest energy bond dissociation reaction in the MFR model compound, is calculated to be homolysis of the C-O bond of a butyl ether.
	www.chamotlabs.com /ApplicationNotes/HTC/HTC34thMidwest.html (4092 words)

	Fluorine, Iodine, and Bond Energy (Site not responding. Last check: 2007-10-19)
		The bond dissociation energies you cite are the energies required, in kilojoules/mole (do not forget the units - "158" and "151" are meaningless by themselves) for the diatomic molecules to split into two atoms: F-F --> F + F I-I --> I + I Reactivity does not end there, though.
		This pattern is more obvious when we look at the differences between F-R and I-R bond dissociation energies (BDE): R F-R BDE minus I-R BDE (kJ/mol) CH3 216 H 271.5 Cl 45 I 119.1 All of these differences are greater than the difference between the F-F and I-I dissociation energies, which is about 7 kJ/mol.
		So although it takes a little more energy to make F atoms from F2 than to make I atoms from I2, the energy you get back when F combines with something else is much greater than the energy gained when I combines with the same thing.
	www.newton.dep.anl.gov /askasci/chem00/chem00945.htm (330 words)

	Millipore - Technical Library - UV Oxidation in Water Purification
		Therefore, the energy carried in a beam of radiation is inversely related to its wavelength.
		The electrical energy added to the mercury atoms causes specific electron transitions that result in the release of energy as UV radiation.
		The strength of the chemical bonds in a molecule can be described by a bond dissociation energy, which is the minimum energy required to break a particular bond2 (see Table.).
	www.millipore.com /publications.nsf/docs/5a5j28 (902 words)

	Free Radical Reactions
		Carbon-carbon and carbon hydrogen bonds are stronger as are carbon-oxygen and hydrogen-oxygen bonds.
		Second, if we examine the trend in C-H bond dissociation energies as the structure of the alkyl group is changed, we notice that the strongest (435 kJ/mol) C-H bond is between the carbon of a methyl group and a hydrogen atom.
		Since the repeating unit is formed by adding to each end of the double bond of the monomer, the structure of the monomer can be discovered by mentally cutting loose a repeating unit from the polymer and placing a double bond between its carbon atoms.
	chemistry2.csudh.edu /rpendarvis/Radicals.html (1620 words)

	B
		There is a chemical bond between two atoms or groups of atoms in case that the forces acting between them are such as to lead to the formation of an aggregate with sufficient stability to make it convenient for the chemist to consider it as an independent "molecular species".
		Tabulated bond energies are generally values of bond energies averaged over a number of selected typical chemical species containing that type of bond.
		A double bond cannot be placed with one terminus at the bridgehead of a bridged ring system unless the rings are large enough to accommodate the double bond without excessive strain.
	www.chem.qmul.ac.uk /iupac/gtpoc/B.html (1410 words)

	Bond energy - Wikipedia, the free encyclopedia
		For example the carbon-hydrogen bond energy in methane E(C–H) is the enthalpy change involved with breaking up one molecule of methane into a carbon atom and 4 hydrogen radicals divided by 4.
		is needed to cleave the remaining O–H bond.
		The bond energy of the O–H bonds in water is 458.9 kJ mol
	en.wikipedia.org /wiki/Bond_energy (293 words)

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