What is Bond: Definition and 322 Discussions

BOND (Building Object Network Databases) started development in late 2000 as a rapid application development tool for the GNOME Desktop by Treshna Enterprises. Its aim was to fill a gap that traditional Microsoft Windows applications like Borland Delphi, Microsoft Access and Visual Basic filled on the Windows desktop, but targeted for the Linux environment. Its goal was to allow developers to quickly build database forms in XML for backend SQL databases. It has been employed extensively by Treshna Enterprises to develop applications such as PayMaster (an opensource payroll application) and GymMaster (a commercial gym management application).

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  1. P

    Equation for calculating bond enthelpy?

    Is there an equation or algorithm around to calculate bond energies of specific bonds in a molecule purely from atomic properties and the arrangement of the molecule without using lookup tables per molecule?
  2. A

    [Economics] Zero bond obligation

    This assignment is translated from another language, so some words be not be completely correct Homework Statement (Annual market rate might be yield to maturity?) Face value = 1000 Obligation----Condition----Payment profile----Maturity------Annual Coupon Rate-----Annual market rate...
  3. Q

    Bond Angle Questions: Is it Applicable for Single Bonded Atoms?

    When determining the bond angle of an atom, is it not applicable if you have an atom bonded to only one other atom? such as for CO2, would you only be able to write the angle for C, 180 degrees, but not for oxygen despite the lone pairs?
  4. Jackson Lee

    There is little molecule bond between gas molecules, then why we have

    Hey, guys, I have just watced a fantastic animation of the microscopic process of sound wave traveling, in which model was described as many balls connected by springs. But the problem is what we learned in thermodynamics chapter is that there is no bonds between molecules in gas, then how...
  5. S

    No of C=C bond in carbonyl compound

    Homework Statement Compound X has the following composition by mass : carbon(64.3%) , 7.1% of hydrogen and oxygen (28.6%) . X reduces Fehling's solution to CuO . Copper( I) oxide .0.1 mol of X react with 4480cm3 of hydrogen gas in the presence of nickel catalyst. What 's the possible...
  6. D

    Acyl chloride and hydrogen bond

    Homework Statement why acyl chloride can't form hydrogen bond? there's C=O , which O atom can form hydrogen bond . am i right?Homework Equations The Attempt at a Solution
  7. N

    Change of spin during dipolar bond

    OK so we have a dipolar bond between two elements. This bond makes the other electrons redistribute in order to rest in peace. Everything's OK up until now. What happens, however, when two of these other electrons have the same spin an yet they end up together because of this redistribution? I...
  8. K

    Exploring Bond Energy & MO Theory in He2 Molecule Formation

    This is a question in "Chemical Principles, 6th Edition, Steven Zumdahl": Bond energy has been defined in the text as the amount of energy required to break a chemical bond, so we have come to think of the addition of energy as breaking bonds. However, in some cases the addition of energy can...
  9. N

    Does the bond between atoms affect Thermal Expansion?

    Homework Statement From a journal I read that the cobalt-based perovskite cathode usually has better ionic and electrical conduction but higher TEC compare to Maganite-based perovskite cathode. Because of the Co-O bond is weaker than Mn-O bond. e.g. Cobalt-based perovskite cathode...
  10. D

    Total number of C-C sigma bond in phenylethene

    Homework Statement how many is total number of C-C sigma bond in phenylethene? Homework Equations The Attempt at a Solution i have drawn the the strucutre as in the photo. i ended up getting 8 C-C sigma bond. but the ans from my book is 12. How to get 12?
  11. U

    What Determines C-F Bond Lengths?

    Homework Statement Choose correct order of C-F bond length A)C-HF2<C-H2F<C-F3 B)C-F3<C-HF2<C-H2F C)C-F3<C-H2F<C-HF3 D)C-HF2<C-F3<C-H2FThe Attempt at a Solution What factors should I look for while measuring bond lengths?
  12. Q

    Tetrahedron; Sum of Bond Angles

    Homework Statement Prove that if bonding-pair repulsions were maximized in CH3X, then the sum of the bond angles would be 450°. Homework Equations In a perfect tetrahedral molecule (e.g. methane), the sum of the bond angles is about 438 degrees (109.5° times 4). The Attempt at a...
  13. Q

    Number of identical bond angles in PBr2F3

    Homework Statement Consider the geometric isomer of PBr2F3 with a Br-P-Br bond angle somewhat larger than 120 degrees. It is also true that for this isomer ... There are two sets of identical bond angles. Homework Equations PBr2F3 is trigonal bipyramidal (although distorted)...
  14. Q

    What factors determine the strength of a covalent bond

    I want to know what factors influence the bond enthalpy of a covalent bond and how do those factors influence the bond strength.
  15. A

    Rationalization of bond angle/ bond pair repulsions.

    Homework Statement I need help rationalizing the following: a) Bond angle for H2S is only 92o whereas bond angle for H2O is 104.5o. b) If bond-pair<-> bond-pair repulsion is maximum for the C-H bonds in CH3X, ∑ all bond angles is 450o for CH3X c) For CH2Br2, the H-C-Br will be the smallest...
  16. S

    Diatomic molecules bond energies

    The bond enthalpies for these bonds are: C-C 347 kJ/mol C-N 276 kJ/mol C-O 351 kJ/mol Why is carbon-nitrogen bond enthalpy lower? What factor makes that? And also the halogens bond enthalpies: F-F 157 kJ/mol Cl-Cl 243 kJ/mol Br-Br 193 kJ/mol I-I 151 kJ/mol Why has fluorine lower enthalpy? I...
  17. M

    Is an intramolecular bond the same thing as an intramolecular force?

    ? And could you give some examples of intramolecular bonds please?
  18. R

    MHB Defaultable bond question

    Hi! Just wondering if anyone could help with this question: "now price a bond that is of a 4 year maturity and if it defaults in year t+k incurs a loss of 20%, but it does not terminate, and continues to be traded up to and including the fourth year" as I understand this is a defaultable...
  19. Q

    Chemistry Bond Angles in Trigonal Bipyramidal Molecules

    Homework Statement What are the number of different bond angles for the isomer of F_{3}PCl_{2} with each chlorine equatorial? What about for the isomer of BrPF_{4} with the bromine axial? According to the key the the first molecule has 5 unique bond angles. Homework Equations Trigonal...
  20. M

    Bond Enthalpy at Different Temperatures

    I was recently learning average bond enthalpies and was wondering if it varies at different temperatures. I know that in different molecular configurations, bond strength is affected by the arrangement of the atoms, but at higher temperatures, there is higher vibrational energy, right? So, if we...
  21. L

    Theory of everything and chemical bond theory

    Hello, Theoretical physicists assert that quantum mechanic and relativistic world use distinct mathematical models that can not united into one so far. The reason of it, which I do not understand, is the gravity. Once we encompass the gravity in the quantum world (or vice versa), we (maybe)...
  22. F

    Calculating Bond Energy of Steel Using Theoretical Strength Eqn

    Homework Statement Steel has a theoretical strength of 4 x 10^10 Pa a density of 7860 kg/m^3, Youngs Modulus of 2 x 10^11 Pa and the mass number of iron, the main ingredient in steel, is 56. Calculate the bond energy of the steel using the expression for theoretical strength and surface...
  23. P

    Quadruple bond between two carbon atoms

    I was wondering if a quadruple bond between two carbon atoms would be possible. I found this on wikipedia about "dicarbon": http://en.wikipedia.org/wiki/Diatomic_carbon, which is related to this question, since what I'm describing is an isomer of dicarbon. Anyone have any ideas?
  24. R

    Finding the bond length of hydrogen theoretically

    If the bond length of two atoms is the distance where the force of repulsion is equal to the force of attraction, then one could figure out what the bond length of H2 is by setting the net force of attraction to the net force of repulsion and solving for distance. However when I try this ...
  25. F

    Bond energy between two water molecules

    Homework Statement Estimate the bond energy between two water molcules (liquid) in the following way A: From the density of water and its molecular weight calculate the average distance between the molecules B:hence show that there are 10^19 molcules per m^2 of surace C:from the...
  26. P

    Exact bond energy calculations

    I need some maths for a program to determine the exact (or as close as it can be mathed) bond energy of bonds from the first two rows of the periodic table S and P orbitals all the websites I can find tell you what the average bond energy for a specific common bond is but that won't do for...
  27. Q

    Comparing Bond Lengths in Pairs of Bonds

    Homework Statement In which of the following pairs of bonds is the shorter bond length not followed by the longer bond length? (1) S―O, P―O (2) C≡C, C=C (3) C=O, C=S (4) C―Si, C―S (5) N≡O, N=O Homework Equations Bond length is determined by the bond order (number of bonds)...
  28. G

    Covalent bond of 2 or more atoms?

    I am not in Atomic physics, Everywhere is the standard picture of a bond with 2 atoms sharing 2 electrons. Why is it not possible to share 3 or more electrons that it would form something like a tetrahedron (see attachment)
  29. gauss44

    Why does phosphodiester bond have diester as part of it's name?

    Why does "phosphodiester bond" have "diester" as part of it's name? Why does "phosphodiester bond" have "diester" as part of it's name? I don't see two esters. I must be overlooking something. Maybe it's because the two riboses can dissociate into ester form? Thanks.
  30. Hyo X

    Where Can I Find a Comprehensive Reference for Bond Strengths?

    Hi, I am looking for a good reference on the relative strengths of several bonds. (I think this is the same as bond dissociation energy?) I.E., C-C, C-S, C-N, S-Au, etc. Is there a good reference out there? thanks
  31. gauss44

    Can sulfur participate in a hydrogen bond?

    I googled it and got both answers, "yes" and "no." What I mean is: O-H-S, F-H-S, N-H-S, etc. Ex.'s of "yes": http://www.ncbi.nlm.nih.gov/pubmed/19089987 [PLAIN]http://pubs.rsc.org/en/content/artic.../ce/c0ce00760a[/URL] Ex. of "no": http://www.nature.com/nature/journal.../149218a0.html
  32. jaumzaum

    Is it a ionic or a covalent bond?

    In the compunds below, are the bonds most ionic or covalent? CH3-Mg-Cl (Grignard reagent), C-Mg bond [Ag(NH3)2]+ (Tollens' reagent), Ag-N bond Thanks John
  33. A

    Which intermolecular bond is stronger?

    Does covalent or ionic bond bond is stronger?
  34. C

    Will the formation of a dative bond change the oxidation number?

    Consider NH3, if it forms a dative bond with an H+ to form an ammonium ion, will the oxidation number of N change from +3 to +5? My reasoning is that it uses 5 electrons in bonding. Is that correct?
  35. D

    Hydrogen bond between tetrafluoromethane and water

    Homework Statement My textbook wrote that haloalkanes are generally insoluble in water.It is because the polar C-X bonds are not polar enough to make the haloalkanes soluble in water. Consider tetrafluoromethane Difference in electronegativity between F and C = 4.0 - 2.5 = 1.5 Difference in...
  36. S

    C-O vs. C=C Bond: Which Is Less Stable & More Reactive?

    Question Statement: Which of the above is less stable and more reactive? Relevant Equations: None really. Attempt at solution: Well, the C-O bond's bond energy is lower so I argued that since it takes less energy to break this bond than it does to break the C=C double bond, then it (C-O) is...
  37. marcus

    James Bond and the true value of the cosmological curvature constant

    Einstein discovered that general covariance allows his GR equation to have just TWO gravitational/geometric constants: Newton G and a curvature constant he called Lambda. So the symmetry of the theory requires us to put both constants into the equation and investigate empirically whether or not...
  38. C

    Chemistry Bond angles in antidote molecule

    Homework Statement Please refer to the image Why is y 109 degrees?(given by my teacher) Homework Equations None. The Attempt at a Solution There are four atoms around the carbon atom, I assumed it to be tetrahedral. Why is that wrong?
  39. W

    Equilibrium bond lengths for excited molecules

    When making the Morse Potential graphs of diatomic molecules going through a transition, the excited state sometimes has a different equilibrium bond length. A visual example is here: http://en.wikipedia.org/wiki/File:Franck-Condon-diagram.png I was wondering how the average bond length of...
  40. C

    Position of subshells in a bond

    I've learned that there are three types of p shells, namely Px, Py and Pz, each in a different direction. I've also learned that when different atoms bond together, they form specific shapes depending on the number of bonds and electrons. I want to ask, will the shape of the p or d subshells...
  41. M

    How to find the Bond length of N(2)

    Homework Statement I know that The diameter is 0.33nm but I am not sure if this is relevant. The Attempt at a Solution The sources I have found say that bond strength is not something you calculate but look up. This seems unlikely to be the case for this question however I cannot find a...
  42. tsuwal

    How to deduce the bond energy/distance relation (with grah)?

    https://www.google.com/search?hl=pt-PT&q=potential+energy+curve&tbm=isch&tbs=simg:CAQSWgmiv8BdfMuabhpGCxCwjKcIGjQKMggBEgzUBt8GogeoB6cHpgcaINsvJGealnimdPrsI3wtVoz6gqeyB8qrabdVeAx3e1vHDAsQjq7-CBoADCGpFP3k7rrt1w&sa=X&ei=sW4uUd7TDY6xhAelv4CIDg&ved=0CCYQwg4&biw=1366&bih=643#imgrc=or_AXXzLmm6FRM%3A%3Bq...
  43. L

    Young's Modulus and Interatomic Bond Length PLEASE HELP

    A hanging wire made of an alloy of titanium with diameter 0.14 cm is initially 2.9 m long. When a 97 kg mass is hung from it, the wire stretches an amount 1.49 cm. A mole of titanium has a mass of 48 grams, and its density is 4.54 g/cm3. Based on these experimental measurements, what is...
  44. J

    Hydrogen bond vs dipole-dipole?

    I saw a video on youtube saying water molecules were held together by hydrogen bonding, not dipole dipole. Why is that?
  45. J

    Engineering Back to engineering after a 5-year scholarship bond in fund management?

    Hi all, This forum has been a great resource for me for quite some time, but this is my first time posting a thread. A fund management company is willing to sponsor my undergraduate studies in engineering at a top university. The 'catch' is I have to work 5 years for them after I graduate...
  46. D

    Determine if a bond is more ionic or covalent

    Homework Statement What has more ionic character NaF or NaCl?Covalent? Homework Equations Measured Dipole moment of NaF 27.2e^-30 Measured dipole moment of NaCl 30e^-30 Dipole moment=qd Fractional ionic character=measured dipole moment/qd Equilibrium separation of NaCl =.236nm...
  47. P

    Determining Bond Length with Wavelengths

    Homework Statement Calculate the bond length for the NaCl molecule given that three successive wavelengths for rotational transitions are 23.1 mm, 11.6, mm and 7.71 mm. Homework Equations I = h*wavelength/4pi*speed of light. The Attempt at a Solution I don't understand how to...
  48. D

    Why is the Average Bond Enthalpy of O2 Different from its Formation Enthalpy?

    why is average bond enthalpy of O2 is 495...But the formation enthalpy of O2 is 0 ?? Why are they different??
  49. D

    Torques(Equilibrium of Solid Objects) Homework Problem - James Bond

    Homework Statement James Bond and Dr. No are engaged in fisticuffs on a board overhanging a pool. Dr. No now pulls out his weapon. oh no!. Bond is in trouble again. Bond quickly calculates the torques and leaps off the left end of the board leaving Dr. No on the right. Is Bond safe? That is...
  50. Y

    Is the Strength of a Chemical Bond Determined by Ionic or Covalent Character?

    As i know chemical bonding can be considered as a spectrum of bond ranging from covalent to ionic. Now can we say that ionic bond is harder than covalent bond?? Since covalent bond is a result of attractive n repulsive bt ionic only attractive . If it does, instead of bond length factor, HF...
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