Bond Definition and 306 Threads

Consider the hypothetical molecule 1,3,5-cyclohexatriene (not benzene, I am referring to a molecule where no resonance takes place - a molecule with three C=C bonds and 3 C-C bonds). Each carbon atom in this molecule would be participating in one double bond, and so each carbon atom would be sp2...

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?

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...

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?

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...

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...

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

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...

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...

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...

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?

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?

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...

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)...

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

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...

? And could you give some examples of intramolecular bonds please?

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...

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)...

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...

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?

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 ...

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...

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...

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)...

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)

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.

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

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

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

Does covalent or ionic bond bond is stronger?

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?

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...

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...

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...

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?

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...

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...

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...

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...

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...

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

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...

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...

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

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...

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...

please can anyone explain me in simple words why energy is released when bonds are formed?

For metals for instance, is the metallic bond that determines the crystal structure(i.e. FCC (face centered cubic), HCP (hexagonal close packed)) or is the crystal structure that determines the type of bond? In other words, if someone were to ask me what kind of bond an element with an FCC...

In the following link http://en.wikipedia.org/wiki/File:Silicon-tetrafluoride-2D-dimensions.png the bonds are represented pictorially in different ways(like the black triangle). Do these just show the physical structure of the bonds or do they show the different types of bonds?