Bond Definition and 306 Threads

Hello PFers, a chemistry question that I need help with awaits! Homework Statement 10.42 Describe the types of bonds and orbitals in the following: (a) NO3-; (b) CS2; (c) CH2O; (d) FNO; (e) C2F4. Homework Equations The Attempt at a Solution I tried to visualize the kind of...

Homework Statement The values of standard enthalpy of formation of SF6(g), S(g), F(g) are -1100, 275, 80 kJ/mol resp. What is the average S-F bond enthalpy in SF6? Homework Equations The Attempt at a Solution I read that the bond enthalpy is negative of enthalpy of formation from...

Stronger bond= lower energy? why? "In an exothermic reaction, some of the potential energy stored in the chemical bonds is being converted to thermal energy via kinetic energy(heat) In this exothermic process, the bonds in the products are stronger than those of the reactants." This does not...

I often hear that metals and nonmetals can only form ionic bonds, but is this true when difference in electronegativity between the atoms is low? Shouldn't they be able to form polor covalent and nonpolar covalent bonds? Or do the electronegativity based predictions fail in these cases?

Homework Statement A $500, 8% bond is purchased on Feb 1, 2004 to yield 10% compounded semiannually. The interest on the bond is payable on Feb 1 and Aug 1 each year. Find the purchase price if the bond is redeemable at face value on Feb 1, 2014. Homework Equations The Attempt at...

Dear all: I wonder how the adhesion between Al and Au is. I am going to deposit Au on top of Al layer. Regards.

Homework Statement Given that the total cohesive energy, U, in an ionic crystal as a function of nearest neighbor distance, R, between two ions +e and -e is given by: U(R) = \frac{A}{R^n} - \frac{\alpha e^2}{4 \pi \epsilon R} show that at equilibrium: U(R) = \frac{\alpha e^2}{4 \pi...

N-F C-F H-F O-F would it be H-F since the difference between the their electronegativities is the greatest?

Can someone explain to me the fundamental understanding of why, when two hydrogen atoms for example, release energy when they form a covalent bond? I can't seem to comprehend. Here is my reasoning, please see if this makes any sense of I am simply going in the wrong direction, I would really...

Hi, Im doing an IB Extended essay on astrophysics, on the planning stage. My aim is to calculate the surface temperature of an extrasolar planet. I have most of the caculations done, but I am stuck on just one part - calculating the Bond albedo of the planet. I know what the geometric albedo...

I'm just wondering why it's important for atomic structures to contain protons. Hydrogen-3 has two neutrons and one proton. Could you have a particle with two or more neutrons held together by nothing but the strong nuclear force? Is the reason I don't know about this because such particles...

Hi. i don't know a lot about chemistry so bear with me. the bond is between a member of the carboxyl group and the amino acid lysine. as i understand i need an enzyme. what readily available enzyme would suffice? would protease work?

Homework Statement What is the bond order of B22- Homework Equations (Number of bonding electrons - number of antibonding electron)/2 The Attempt at a Solution (3-0)/2 = 1.5, which is wrong. What's going on?

Homework Statement One mole of iron (6 *10^23 atoms) has a mass of 56 grams, and its density is 7.87 grams per cubic centimeter, so the center-to-center distance between atoms is 2.28 *10-10 m. You have a long thin bar of iron, 2.9 m long, with a square cross section, 0.05 cm on a side...

What is a quoted price of a bond? Is it a clean price? I think it is the present value of the face value of a bond, am I correct? What is the quoted price of a bond that has 4.5 years until maturity? The face value of the bond is $5,000 and it has a coupon rate of 8.1% compounded...

Can anyone give me some insight into any materials/substances that might bond to calcium fluoride (CaF2)? Any help is appreciated, thanks.

[b]1. The equilibrium bond length of the He dimer is 2.97 angstroms. What is the binding energy in kJ/mol for this dimer? Would be dimer be stable at room temperature T= 300K (Hint: compare the binding energy to kT) [b]2. interaction potential for the dimer: V(r) =...

Nitrogen double bonded with Oxygen... I can't find the bond enthalpy for it ANYWHERE, please help :(

Bond angle in methane? Have been doing for 1 hr! Homework Statement In the methane molecule, CH4, each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center. In coordinates where one of the C-H bonds is in the direction of i + j + k, an adjacent C-H bond is...

I am having trouble identifying the difference between VB theory and molecular orbital theory. To me, they seem to be one and the same. In VB theory, two atomic orbitals overlap and share electrons forming a bond... Wouldn't this combination of two Atomic orbitals make a molecular orbital?

its being said, " more the loss of energy, more the strength of the covalent bond" revered members, could u explain why? thanks in advance

Homework Statement Show that the bond length for sodium chloride is 0.28nm given that it has a relative density of 2.2, sodium has an atomic weight of 23, and chlorine 35.5. Avogadro's number is 6.0x10^23 Homework Equations The Attempt at a Solution I've tried many things but...

Can someone please tell me why the heads of the big Wall Street bond rating agencies haven't been charged yet? I don't even know if they're being investigated. We hear a lot about AIG and the banks, but not a lot about outfits like Moody's. I've called news organizations and I don't get good...

Does an atom ALWAYS need to be hybridized in order for it to bond to other atoms? Why or why not? In what cases does it need to be hybridized in order to bond with other atoms?

I just watched Casino Royal and Quantum of Solace again in chronological order and had a revelation. The first time I saw Casino Royal shortly after it was released I didn't think much of it. A year or what ever later I then saw Quantum of Solace and thought it was pretty boring. I recently...

Hi, first time poster. Quick question: Why is the bond energy for a bond that contains a more highly substituted (tertiary) carbon weaker than the bond energy of a bond that contains a less substituted (primary) carbon? Let me clarify with an example. Say Bond A is a single bond between a...

Homework Statement Look at the diagram accompanying the question. Which has least C-H bond energy? The Attempt at a Solution On cleavage of a C-H bond, a carbanion is formed as carbon is more electronegative than hydrogen. So cleavage of (b) results in a carbanion stabilized by resonance

Question Details: Is CO paramagnetic or diamagnetic? i put diamagnetic because there are no lone paris is that corrects? and If CO gained one election, becoming CO^-, would the bond become weaker or stronger? i believe that the bond would become weaker since there is one lone pari and it...

Not sure where this goes, but here goes: Water O-H bond is usually thought of as 0.942 angstrom when looked at as H2O molecules. This very nice site on water http://www.lsbu.ac.uk/water/evidnc.html suggests that x-ray data O···H peaks at 1.85 Å and 3.3 Å with no peak less then 1.85...

Hi PF members, Is there any good glue/adhesive to bond a 30 micrometer kapton foil to copper metal... The bonding should be strong enough to withstand liquid helium temperature (my working condition is 4.2 K to room temperature)...I can cure only at room temperature. or anyone have some...

Br=2.8 P=2.1 i know that we should subtract them but my formula is: PBr_3 and how to know if its a yonic bond dipolar bond or covalent bond ??

Fe=[Ar]3p^6 4s^2 it needs to give 7 electrons to become neutral. S=[Ne]3S^2 3p^4 it needs to take 2 electrons to become neutral.how to describe Fe_2 S_3 ??

http://img525.imageshack.us/img525/2290/84419342em1.th.gif in case A: S has a bigger electonegative energy then Ca so it will "take" 2 electrons from Ca inorder to be a complete gas like (Ar) so i know why there is +2 on Ca and -2 on S . Ca has after perfect gas 4S^2 S...

For fun I showed this to my parents. They don't have the guts to play spreads. I have no money to invest so, tell me what you guys think. Why Short Long Bonds If my calculations are correct a drop in the 30 year treasury to 2% from 3.22% would result in 21.3% capital gain on a long...

Cl gets similar electronegativity as N, NH3 is a hydrogen bond, but HCl isn't, why? N and Cl also gets lone pair electrons! N and Cl is more or less the same. Could anybody please answer this question? Okay, if I rephrase it, it will become why the bonding between H and Cl isn't hydrogen...

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...

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

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?

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

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

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

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...

“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...

“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...

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

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.

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...

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?

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...