Bond Definition and 324 Threads

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. S

    Find Bond Angles: Step-by-Step Guide

  2. K

    Determine the homolytic C-H bond strength in CH3OH employing the following data.

    DfH (CH3OH) = -201.6 kJ mol-1 DfH (H) = 218 kJ mol-1 DfH (HBr) = -36 kJ mol-1 DfH (Br) = 111.9 kJ mol-1 CH3OH + Br  CH2OH + HBr k(300K) = 1 x 106 M-1s-1; k(350K) = 4 x 108 M-1s-1 CH2OH + HBr  CH3OH + Br k(300K) = 1 x 107 M-1s-1; k(350K) = 7.7 x 108 M-1s-1 Any help would be...
  3. M

    Can metal plates bond to crocodile clips when electricity is passed through?

    Why doesn't a metal plate bond to the crocodile clips (or whatever) when electricity is passed through the crocodile clips to the metal plate. Shouldn't the electrons passing from the metal plate, to the crocodile clips cause a covalent bond? Quick Diagram
  4. F

    What Determines the Bond Order of CO+?

    What is the bond order of CO+ I don't even understand how do this because C does not obey the octet rule in this case. Can anyone help?
  5. B

    Understanding Bond Enthalpies: Make and Break Bonds

    Bond Enthalpies..please help! Got the first one, but can't figure out how to do "b" and "c." Not understand which ones make/break. http://rapidshare.com/files/157266091/Enth.jpg
  6. J

    Cl-C-Cl vs H-C-H Bond Angles in CH4 & Dichloromethane

    How is the bond angle for Cl-C-Cl in dichloromethane different from H-C-H bond angle of CH4? Is it smaller??
  7. S

    Difference between bond length and lattice constant

    Can anyone explain to me the difference between the bond length and the lattice constant? I'm thinking specifically about cubic crystal systems. Thanks. -Alan
  8. A

    How Do Bond Energy and Bond Lengths Vary Among Different Bonds?

    Is it true that the tripple bonds ahave higher energy than doubble bonds and doubble bonds have more energy than singlebonds? So if we were asked to arange the following bonds from highest energy to lowesst energy it would look like this: N---N (nitrogen- nitrogen tripple bond) C--O...
  9. L

    Length of an interatomic bond in nickel

    Homework Statement A hanging nickel wire with diameter 0.13 cm is initially 2.6 m long. When a 139 kg mass is hung from it, the wire stretches an amount 1.33 cm. A mole of nickel has a mass of 59 grams, and its density is 8.9 g/cm3. Homework Equations a) What is the length of an...
  10. F

    How do I calculate the length of a chemical bond?

    “In C6H8, the carbon atoms are connected in a chain. In a rough approximation, some electrons can be viewed as confined to a line with the length of this chain. C6H8 absorbs ultraviolet light with wavelength 357 nm, which causes an electron to change from the third lowest allowed energy to the...
  11. F

    How do I calculate the length of a bond?

    “In C6H8, the carbon atoms are connected in a chain. In a rough approximation, some electrons can be viewed as confined to a line with the length of this chain. C6H8 absorbs ultraviolet light with wavelength 357 nm, which causes an electron to change from the third lowest allowed energy to the...
  12. J

    Can sodium sulphate, p-toluidine, and benzoic acid form hydrogen bond

    can sodium sulphate, p-toluidine, and benzoic acid form hydrogen bond with water?
  13. H

    Calculate the approximate frequency of the C-H bond

    Calculate the approximate frequency of the C-H bond, with the force constant of k = 500 N/m. Use: Frequency = (1/2pi) Sqrt(k/((m1m2)/(m1 m2))) BUTT WHAT DO I USE FOR MY MASS VALUES?? I tried, 12.011g/mol and 1.01g/mol and that is incorrect.
  14. N

    Creating an Eternal Bond: Neal's Math & Physics Equation

    So, to start off... My name is Neal, I'm 32, and a pharmacist. I'm an only child and my mother means the world to me, which is bad because her health is quickly diminishing. So I wanted to do something that could always connect me with her forever and this is where you guys come in... I can't...
  15. B

    ATP contains energy in its high energy bond

    I understand that ATP contains energy in its high energy bond. However, there are two high energy bonds in ATP. Thus ADP still has 1 high energy bond. Is this bond used for energy? Can you give an example where the energy of ADP is used?
  16. P

    How Can You Move a Pi Bond Into a Cycloalkane?

    Hello. This is driving me a little mad, and some assistance would be hugely appreciated. Homework Statement Show how the following transformation can be achieved (more than one step may be involved) Homework Equations The Attempt at a Solution The only approach i could come up with was the...
  17. K

    Calculating Average C-H Bond Energy in Methane

    Homework Statement by means of a balanced equation, including state symbols, illustrate the term the average C-H bond energy in methane. The Attempt at a Solution i know what that all the C-H bonds in methane are not the same, and the mean of these bond energies give the average...
  18. S

    Are Carbon-Oxygen Double Bonds More Stable Than Single Bonds?

    2 quick ochem questions... 1. Why is a carbon oxygen double bond more thermodynamically stable than a carbon oxygen single bond? 2. Can -OH be a leaving group in basic conditions, it would seem strange to protinate it in basic conditions? Thanks!
  19. B

    How can something hydrophobic hydrogen bond?

    1) The nitrogenous bases of DNA hydrogen bond with each other yet they are also characterized as hydrophobic? How can something hydrophobic hydrogen bond? 2) How many chromosomes are present in a human somatic cell after S phase (DNA replication). Is it still 46 or 92?
  20. B

    Using bond energies to calculate energy changes

    Homework Statement Use the bond energies (in Table 4.2) to calculate the energy changes associated with each of these reactions. In each case indicate whether the overall reaction is endothermic or exothermic. Be sure to show your calculation work. [b]2. Homework Equations [/b The...
  21. S

    Calculating Bond Order from a Molecular Orbital Diagram

    Hi I was wondering if anyone can tell me how to find the bond order from a molecular orbital diagram. For example i found one on this website attached... "Comparison of the above energy level diagram wit hthat for nitrogen - you can see that the 2sg level lies lower than pu. Here...
  22. L

    What Are the Bond Angles for Clozapine?

    Hi, I'm doing a chemistry project, where we have to build a drug. My group chose Clozaipne (or Clozaril), and we have trouble finding the actual bond angles for the compound. I swear, we looked at dozens and dozens of books, websites, encyclopedias, etc... no luck I was wondering if you guys...
  23. E

    How Close Does the Little Atom Get to the Big Atom in the Energy Bond Scenario?

    Homework Statement Consider a potential energy curve and system as shown in Figure C11.5. Imagine that the little atom approaches the big atom from infinity with an initial kinetic energy K=5x10-21 J. How close to the big atom does it get? a. x=0 b. x=0.04 nm c. x=0.11 nm...
  24. L

    Why do some elements require melting for them to bond

    Why do some elements, particularly the heavy ones, require melting for them to bond with other elements to create metals containing differing atoms? What role does temperature play in the form, conform, and inconform states of elements? And what role do the elements play in requiring...
  25. J

    Enthelpy of Formation vs. Bond Enthelpy

    Homework Statement Find the average bond enthalpy, εN-F, for NF3(g)→ N(g) + 3F(g) Heats of formation NF3(g)→ 1/2N2(g) + 3/2F2(g) -∆ƒHºm = 124.3 kj/mol 1/2 F2(g) → F(g) ∆ƒHºm = 79 kj/mol 1/2N2(g) → N(g) ∆ƒHºm = 472.7 kj/mol...
  26. S

    Why the bond angle of methane is 109 instead of 90?

    I know that the sp3 hybrid orbitals form 109 angle, but why the angle is not 90. If the angle is 109 the repulsion is minimized or what? Show some comparations. Thank u.
  27. S

    Why the bond angle of water is 105 instead of 109?

    Answer please.
  28. P

    Bond where electrons are being transferred?

    1. which letter shows a bond where electrons are being transferred? 2. which letter shoes a bond where electrons are equally shared? 3. which letter shows a bond that would cause each atom to become partially charged 4. which atom can be considered an anion? 5. which bond above would...
  29. D

    Dative bond confusion (or coordinate bond)

    I am a little confused with this. I know what a dative bond is, but the problem is when it comes to complex ions I do not understand. ok now for example NH_3 + H^+ = NH_4^+ So in this the lone pair of NH3 will fill the s- subshell of H and make it stable, but say in Cu^2^+ when this attracts...
  30. Ahmed Abdullah

    What make atoms to form co-valent bond?

    If atoms are truly neutral(electrically) there should be no electrostic attraction between them, because there is no electric field out side the atom(All electric fields starting from the positive nucleus of the atom ends in the equal negative charge of electrons, which are inside the atom)...
  31. P

    Metal + nonmetal = covalent bond?

    In textbooks they normally emphasis the fact that when metals and nonmetals bond, the nonmetal takes away an electron from the metal resulting in ionic bonding betwen the two. But metal and nonmetal can still result in covalent bonding when the electronegativities between the two are similar...
  32. Repetit

    Can Thermal Energy Break a Covalent Bond?

    Hey! I want to estimate the temperature needed to break a covalent bond of strength 1.70 eV. Whould it be correct to compare the thermal energy k_B T to the bond strength and find the temperature needed to make the thermal energy larger than the bond strength? I get a temperature of about...
  33. F

    How Can Two Bullets Fired from the Same Rifle Collide Midair?

    Hi! I have been trying to figure out this problem for hours now. If I want two bullets discharging from the same rifle to collide in midair with just a change in the angle of elevation. Can you show the time interval needed? I think that this question is interesting enough to be posted...
  34. H

    How to calcualte C-C bond energy of diamond by DFT

    Dear all: I want to calculate the C-C bond energy of diamond and the dangling bond energy on diamond surface by DFT. How can I do? Can you tell me ? Thanks a lot! H. L. Yu :confused:
  35. F

    Bond Dissociation Energies (BDE) help, please

    Well, I'm working on a lab report for my general chemistry class, and we're supposed to answer questions on bond dissociation energies, but we never even discussed that during the lecture. I cannot find any information on it in my textbook, and I am really lost on how to answer these questions...
  36. C

    What is the nature of the bond in sodium dodecylbenzene sulfonate?

    I have to write a report on the bonds of the following element sodium doecylbenzene sulfonate. The problem is in the pic (see pic) the sodium doesn't have a bond to anything is this an ionic bond? Plz help I'm extremely confused:bugeye:
  37. F

    Fe-N Bond Energy in Heme Group of Haemoglobin

    I've been searching far and wide and simply cannot find any info on the BOND ENERGY of a Fe- N coordinate-covalent bond, like that found in the heme group of haemoglobin. it looks like this: ... N ... | N -- Fe2+ -- N ... | ... N The Fe2+ ion also...
  38. O

    The name is Bond. Zoobyshoe Bond.

    Am I crazy or did I just see Zoobyshoe near the bottom of this page? :bugeye: http://craignotbond.com/craignotbondp1.html"
  39. D

    P orbital, π bond, and lots of questions

    p orbital, π bond, and lots of questions :) I’m a little bit confused, and I APOLOGIZE if I’m asking too simple and stupid questions. OK, we have two atoms, each with one p orbital (8), occupied with one electron and they form π bond. You all know how π bond looks 8=8, and I wondered why...
  40. S

    Metallic Bond Formation: Explained

    How are metallic bonds formed? Does it have anything to do with the merging of d orbitals to obtain a half full shell configuration or is it something else? Thank you for your time. -Scott
  41. Gamma

    What is the present value of the bond?

    Hi every one, I have this problem to solve at my work. I am not sure it belongs here or not. Bond Valuation-Semiannual interest Find the value of a bond maturing in 12 years with a $1,000 par value and a coupon interest rate of 12% (6.0% paid semiannually) if the required return on...
  42. P

    Which Bond is Stronger: Metallic or Covalent?

    which is the strongest of all the chemical bonds? metallic or covalent?
  43. C

    Questions about dative covalent bond and complexes

    does an atom necessarily becomes +1 charged after forming a dative covalent bond with another atom? just like something I learned in organic chem: C6H5-H2N:+ H+ ------> C6H5-H2N+→H the positive charge of H+ is transferred to the N atom as N forms a dative covalent bond with it...
  44. P

    Why is covalent bond a directional bond ?

    why is covalent bond a "directional bond"? why is covalent bond a "directional bond"?
  45. S

    What Orbitals Are Involved in Bond Formation for Common Molecules and Ions?

    For the following molecules and ions, indicate the obitals involved in bond formation. 1) SO2 The central atom is S, and it has 1 double bond with a O and a single bond with the remaining O. There is also 1 lone electron pair. Therefore, a S-O bond is sp^2-p while a S=O bond is sp^2-sp^3...
  46. J

    Light that has enough energy to cause this bond to break?

    I really need help with this problem. I need to know how to work it and the answer. I am trying to review all these problems and they do not have answers. 2. It requires 242.7 kJ/mol to fragment Cl2 molecules into Cl atoms. What is the longest wavelength (in nanometers) of light that has...
  47. A

    Bond Angle, Can Someone Tell Me if I'm Correct?

    I am to find the angle OSeO in the molecule SeO2. After drawing the Lewis Structure and such, I am saying 180o. Is this correct?
  48. L

    Question on how to calculate bond energy in crystal.

    Dear all: Since bond energies in crystal are very important in say single crystal growth theory, and it seems very difficult to do such calculations. However, can someone give me some hints on this task, or if there is a perfect solution, please let me know. Sincerely Hongbin Zhang
  49. A

    How do Nuclear Submarines work in the James Bond movie

    I was watching a movie the other day, 007: The World is Not Enough In the movie a well known terrorist, Renard, stole weapons grade plutonium. He sent 6 Kilos to waste on Elektra's pipeline, and the other 6 Kilos he is going to use in a Nuclear submarines reactor. I just wanted to know, what...
  50. P

    Predicting bond angles of ions/molecules

    -how to predict the bond angles of ions/molecules...how?
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