For questions about chemical bonds (ionic/covalent/etc.), their properties (length, energy, angle, etc.) or their relation to other molecular properties (intermolecular forces/dipole moment/etc.). Do not confuse this tag with [lewis-structures], [dipole], [intermolecules-forces], etc.
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0answers
13 views
Iron Sulfides: What about it's chemical structure makes it useful to us? [on hold]
I've been doing research on Iron Sulfides and I was wondering:
Iron(II) sulfide is used as a pigment, in things such as hair dyes, paint, ceramics, bottles, and glasses.
Iron(II) disulfide has been ...
2
votes
0answers
23 views
H-N-H bond angle in ammonia boron trifluoride adduct
In the reaction:
$\ce{NH3 + BF3 ->}$ NH3-BF3 does the HNH bond angle increase or decrease?
Surely, the FBF bond angle decreases because boron changes from $\ce{sp^2 -> sp^3}$. But how can we ...
-1
votes
0answers
19 views
dinitrogen tetraoxide resonance structure question [on hold]
Why there is no dinitrogen tetraoxide resonance structure with nitrogen double bond, like $\ce{N=N}$? I've known that $\ce{N=O}$ and $\ce{N-O}$ is acceptable as a resonance structure, but why the bond ...
0
votes
0answers
11 views
Bond enthalpy of Isotopologes of CO2
at the moment I am looking for a relaible source listing all (or some) bond enthalpies of C-O bonds with different isotopes. Or force constants, all I need is a measure of the bond strenght.
E.g., ...
-1
votes
0answers
20 views
Compare The O-F bond length in O2F2 and OF2 [closed]
My book says we have to compare the bond order but why so
-1
votes
1answer
29 views
Explain the structure of HNC (Hydrogen Isocyanide)
What are the different types of bonds present in the structure?
Does Nitrogen donates one electron from its lone pair to carbon and acquires a positive charge?
How do I determine the Oxidation state ...
0
votes
1answer
40 views
Are 3-center-2 electron bonds and and banana bonds same?
While reading about diborane, I came to know that the two bridging hydrogen atoms in diborane form 3 center 2 electron bonds. On account of repulsion between the two hydrogen nuclei, the delocalised ...
1
vote
1answer
24 views
Do all sigma bonds are stronger than pi bonds? [closed]
Many textbooks refer that sigma bonds are stronger than pi bonds . But each individual bond ( between different atoms) have different bond energy. So how we know for sure that every possible sigma ...
0
votes
1answer
58 views
According to MO theory, why is $\ce{Li2+}$ more stable than $\ce{Li2-}$?
By MO theory, $\ce{Li2}$ fill up two electrons in $\sigma_{g2s}$ molecular orbital.
$\ce{Li2+}$ fill up one electron in $\sigma_{g2s}$ MO.
$\ce{Li2-}$ fill up two electrons in $\sigma_{g2s}$ MO, and ...
-3
votes
1answer
65 views
Why lattice energy of NaCl is more than CsCl?
Why is the lattice energy of Nacl more than that of CsCl?
If size of Na is smaller than that of Cs, then according to Fajan's rule, Na should polarise Chlorine more and therefore, NaCl must have more ...
4
votes
1answer
74 views
Bonding in Zeise's salt
I am not sure I completely understand the bonding in coordination compounds formed by donation of pi electron cloud by the ligands to the central atom.
For example, consider Ziese's salt:
I came ...
0
votes
0answers
21 views
Why is s-s sigma overlap weaker than p-p sigma overlap?
s-s sigma(head-on overlap) bonds are weaker than s-p sigma bonds which are again weaker than p-p sigma bonds. But shouldn't it be the other way around as s orbitals have higher penetration power than ...
-1
votes
0answers
24 views
Strength of anions bonds
Why is the strength in anions like BH4- stronger than the strength of bonds like BH3? Is it because the electronegativity difference between the B-H in BH4- is smaller than the electronegativity ...
-1
votes
0answers
45 views
Which bond breaks when P4O6 melts?
P4O6 is a compound with covalent bonding between Phosphorus and Oxygen atoms. Comparing with SiO2, it has weak intermolecular forces where as SiO2 has giant covalent structure.
When melting these two ...
-1
votes
0answers
34 views
Why is metal not an ionic compound?
I wonder if this could be explained: there are positive metal ions in a metal crystal, but a metal is not an ionic compound. Than you!
-1
votes
2answers
55 views
Carbonyl bond vs alkene bond
Why is that carbonyl bonds are stronger than those of alkenes? It's a basic question but I've never really thought much about it.
I've read several times that carbonyl bonds are shorter and you need ...
0
votes
2answers
41 views
Hybridization in ethene [closed]
I recently learned that there is such thing as a hybridization in chemistry, but I don't really get it.
For example, in $\ce{C2H2}$ (Ethene), they say the there are 3 electrons in three ${sp^2}$ and ...
0
votes
0answers
88 views
pi molecular orbitals of benzene
I found the following picture of the $\pi$ molecular orbitals of benzene.
Now, I am having problem on understanding $\pi_3$ and $\pi_5 ^*$
In both of these, we can see that, on right and left, bond ...
1
vote
0answers
60 views
Calculation of average bond length from force constant and IR absorption?
I need some help beginning a problem set problem (just want hints, I'd like to figure it out myself).
The problem gives me the IR absorption for a diatomic, as well as the force constant for the ...
-1
votes
1answer
34 views
Can a bond form between two atoms that don't have 8 electrons?
Generally, atoms like to have 8 valence electrons. But, I'm wondering if it's possible for two types of atoms to form a bond where neither of them gains 8 electrons. Take Carbon, which has 4 valence ...
2
votes
0answers
117 views
What studies show that d orbitals don't play an important role in covalent bonding? (> period 2 elements) [closed]
Take a look at all the following molecules: $\ce{SO3^{2-}}$, $\ce{SO2}$, $\ce{SO4^2-}$, $\ce{PF5}$ and many more you can add. In all these there is a controversy of one of these two types:
Is formal ...
1
vote
0answers
65 views
What bonding allows chloroaluminate (AlCl4-) to form?
How is $\ce{AlCl4-}$ formed when $\ce{Al}$ only has $3$ electrons in it's outershell. It would be able to give $3$ electrons away with $\ce{AlCl3}$ for it to have a full outershell but how does it ...
1
vote
0answers
19 views
Strengthening a clay rocket nozzle with sodium silicate and calcium chloride
"I strengthen the bentonite clay nozzle by dipping the rammed nozzle in a $50\%$
sodium silicate solution and allow to dry in warm oven. Then dip in a strong solution of Calcium Chloride, again dry. ...
2
votes
2answers
120 views
The molecular orbitals of lithium hydride
So my understanding of molecular orbitals is as follows: the molecular orbitals of $\ce{LiH}$ can be thought of as being formed from the interaction/overlap of two atomic orbitals, one from lithium ...
0
votes
0answers
52 views
Why do the 2 carbon atoms does not participate in 2 molecular orbitals of benzene?
I have seen the below given molecular orbital diagram of benzene, I did not understand why does the 2 carbon atoms in $\pi_3$ orbital and $\pi_5$ orbital does not participate in overlapping.
9
votes
1answer
100 views
How can the solid state structure of cyclopentadienyllithium be explained?
In the solid state, LiCp adopts a polymeric multidecker structure where Li atoms are sandwiched between two Cp rings (shown in this diagram from Organometallics 1997, 16 (17), 3855–3858):
If we ...
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votes
1answer
30 views
What force attracts electrons from another atom to a non-closed valence shell? [duplicate]
As I understand the balance in an atom is reached when the number of protons is equal the number of electrons. And the force responsible for this is based on each proton attracting one electron.
But ...
3
votes
3answers
87 views
Relative strengths of methyl, primary, secondary, and tertiary C–H bonds
Which of the highlighted C–H bonds in the following compounds is weakest? (R = generic alkyl group)
I personally thought that the answer was 1 but it is given as 4 in the answer key. I didn't ...
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votes
1answer
37 views
Bent's rule vs Resonance
In CH2=CHCl and CH3CH2Cl , according to Bent's rule, more s character should be towards '=' bond and more p character is towards C-Cl bond in first molecule but in the second one, there should less p ...
1
vote
2answers
187 views
Hydrogen bonds - why not in HCl? [duplicate]
In a textbook1, I found the following clear definition of hydrogen bonds:
The strongest secondary bonding type, the hydrogen bond, is a special case of polar molecule bonding. It occurs between ...
2
votes
0answers
110 views
Do bond lengths change upon protonation of a molecule such as an H2O molecule?
Wouldn't the hydrogen atom in a hydronium cation feel a greater proton repulsion force (nucleus-nucleus repulsions) from the oxygen atom and orient away from the oxygen atom to maximize the attractive ...
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votes
2answers
133 views
Proof that BF3 exists? [closed]
What I know is, elements with octet are stable, But In BF3, Boran doesn't get octet, So, How come BF3 molecule exist? If it exists, How do we know whether it is BF3 or not? Is there any proof that ...
1
vote
2answers
36 views
How can you tell when a molecule forms a lattice [closed]
I came across the molecule SiO2 and didn't realize that in fact, it forms a lattice. How could I have found out that, in fact, it forms a lattice?
1
vote
0answers
508 views
How is the structure of triiodide ion (I3-) possible?
I have seen the structure of triiodide ion ($\ce{I3-}$) but I cannot understand why this structure is even possible. I have seen in my textbook that
$\ce{I_3^-}$ is formed by combination of $\ce{...
0
votes
0answers
27 views
Is bentonite self-healing?
I want to make a shallow pond (3 - 4 ft. max depth) lined with bentonite for both my ducks and willow tree. However, the willow's roots need to be able to penetrate the pond liner and thus the liner ...
8
votes
1answer
224 views
Bond lengths in naphthalene
As I was reading Clayden: Organic Chemistry 2nd Edition, I came across an image of naphthalene showing its varying $\ce{C-C}$ bond lengths, however, I was unable to rationalize the bond lengths by ...
2
votes
1answer
77 views
Hybridization and bonding in ethenone H2C=C=O?
My book says ethenone is a planar molecule, so I was trying to understand its hybridization,I feel that like allenes ethenone too will not be planar. Supposing oxygen and the carbon near it to be in ...
1
vote
0answers
74 views
The nature of Chemical Bonds [closed]
It was nearly a year ago when I appeared for my first interview through the KVPY (a research oriented scholarship exam) when one of the questions the panel asked me was :
What is a chemical bond?
...
-1
votes
1answer
299 views
Bond dissociation energy order for C-C,N-N,O-O & F-F single bond
I couldn't understand the trend of bond dissociation energy of various single bonds. Why C-C>N-N>F-F>O-O.
I had mugged up the trend the now, and according to me BDE should continuously increasing ...
-1
votes
1answer
52 views
What is the difference between ionic and covalent bonding? [duplicate]
What is the difference between ionic and covalent bonding?
6
votes
1answer
93 views
Which chemical reactions don't involve bond breaking?
I recently came across a question in which an option is 'Breaking a chemical bond is the first step in any chemical reaction', which lead me to think of reactions which do not involve bond breaking. ...
1
vote
0answers
26 views
Effect of Electronegativity on Bond Angles in NH3 and NF3 [duplicate]
I am reading a book: Concise Inorganic Chemistry by J.D.Lee (Fifth Edition)
In the chapter-The Covalent Bond, the author says:
$\ce{NF3}$ and $\ce{NH3}$ both have structures based on a tetrahedron ...
1
vote
1answer
131 views
Why does ethane release more energy than ethyne when burned?
My book explains that since ethane contains a single bond, ethene contains a double bond, and ethyne contains a triple bond, and that when burned ethane releases the most energy because "the fact that ...
-2
votes
2answers
66 views
Why does the compound formed after a coordinate bond have a net charge? [closed]
Why does the molecule have net positive charge?
-1
votes
1answer
63 views
Thermal Conductivity of Calcium Carbonate?
Is Calcium Carbonate (Group 1 and 2) able to conduct heat more than other carbonate (Transition metal) allowing for them to be decomposed faster. The reason I am asking this question is because my ...
2
votes
0answers
139 views
How are bond lengths measured experimentally?
How is the bond length between any two atoms in a compound measured?
For example, in the case of graphite, the bond between its two layers is 340 pm. This number must have been measured, so what are ...
3
votes
1answer
415 views
Ionization energy of C2-, C2, and C2+
My textbook says that $\ce{C_2}^-$ has a lower ionization energy than both $\ce{C_2}$ and $\ce{C_2}^+$. I calculated that the bond orders of $\ce{C_2}^+$, $\ce{C_2}$, and $\ce{C_2}^-$ are 1.5, 2, and ...
0
votes
1answer
52 views
Terminology for describing nuclei participating in metallic bonds
I've read many times that in metals (for example sodium metal), what constitutes the crystal lattice is an arrange of atoms, since no electron is given or lost, they are just shared between all the ...
0
votes
0answers
19 views
Predicting which bond breaks during homolysis to generate free radicals
Given is the tertbutyl hypochlorite compound.
On homolytic cleavage of a particular bond in the compound, two radicals will be generated. How can one predict which bond in the compound will cleave ...
4
votes
2answers
330 views
How does the 1.5 bond order of ozone contribute to its instability?
I'm confused as to why ozone is so unstable? I've been told it's because it has a fractional bond order. However, this doesn't make sense to me. Don't fractional bond orders mean resonance and doesn't ...
