Bond Definition and 306 Threads

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...

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!

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?

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...

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...

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...

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...

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...

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...

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.

Answer please.

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...

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...

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)...

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...

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...

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...

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:

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...

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:

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...

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

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...

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

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...

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

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...

why is covalent bond a "directional bond"? why is covalent bond a "directional bond"?

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...

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...

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?

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

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...

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

Bond length, Bond strength, relationship ? Is this always true ? And why? My answer to this question would be, having larger electron density between two nuclei, thus attraction, allows them to position more closely. But somehow I think that there could be some exceptions of this rule...

I recently scoured through Amazon to find a somewhat decent chemistry book, and these are the list of books I am interested in at the moment: Advanced chemistry 1,2 by Phillip C Matthews of Trinity college Dublin Nature of the chemical bond by l.Pauling I got the first 2 books by...

James Bond Style: The character James Bond has a peculiar style of introducing himself by calling first Bond, then followed by great smile & finally James Bond. His style is absolutely killing but he doesn't know the consequences when he meets our great South Indian guy. When Bond meets a...

Bond enthalpies... Apparently from what I have read, mean bond enthalpies are only given for things in gaseous state - why is this the case? Why can we not quote bond enthalpies in, say, the solid or liquid state? Thanks. :-D

Double bond... We always talk about the double bond in an alkene being an area of particularly high electron density, which induces charges on other molecules, which is what usually causes it to react. But why is this only the case for double not single? I mean, single bonds are not overly...

When N2 and H2 are reacted in a bomb calorimeter to form NH3 the temperature of the bomb calorimeter and the water it contains increases. Is the energy required to break the bonds in the reactants greater or less than the energy released during the formation of the bonds of the prouducts. I...

I know that a double bond has the two atoms closer to each other than a single bond. I have to build an organic acid model for chemistry and would like to know: - Is there a ratio between the lengths of C-C bonds to C=C bonds? - Are C-H bonds closer together than C-C bonds? - Are C=O bonds...

polar covalent bonds occur because one atom is much more electronegative than the other right? so..an example of a polar covalent bond is C-H ?

what is the difference between bond polarity and molecular polarity?

Which compound has the smallest bond angle in the series NH3 PH3 AsH3 PI3 AsI3 SbI3 I would think that the molecule with the smallest center atom would have the smallest bond angles because the lone electron pair is held closer to the bonds which means it can push them...

I read that water expands when it freezes due to it's hydrogen bond. What on Earth (or ocean, for that matter) does a hydrogen bond have to do with becoming less dense with freezing :confused: ? Please explain taking into consideration that I haven't taken chem. since 10th grade. Thanks!

Given: Cl2 = 58 kcal/mole ------> 2cl 1. 58 kcal/mole is the bond dissociation energy T F 2. 58 kcal/mole is an entropy term T F 3. this reactin is endothermic T F I don't understand get it! Any help woud be appreciated.

Why in organic chemistry do double bonds not allow rotation of bonds, whilst single bonds do? Thanks. :smile:

I'm working a problem with the BH3 molecule. Therefore boron is 1s^2 2s^2 2p^1, and using the hypotetical method, it forms hybird sp2 orbitals. Promoting an electron to get 1s^2 2s^1 2p^2. My question is that, it will form 3 bonding orbitals, one from the 1s and 2 from the 2p orbitals... what...

I'm working a problem with the BH3 molecule. Therefore boron is 1s^2 2s^2 2p^1, and using the hypotetical method, it forms hybird sp2 orbitals. Promoting an electron to get 1s^2 2s^1 2p^2. My question is that, it will form 3 bonding orbitals, one from the 1s and 2 from the 2p orbitals...

Hey Guys! i was wondering what would be the bond angle of FXe2..would it be 104.5 or 90? thanx Tanya