All Questions
Tagged with intermolecular-forces bond
33 questions
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2
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Why do we not consider the force of repulsion between two cations/anions in an ionic lattice?
Obviously, there are forces of attraction between the Cl- anions and the Na+ cations. But aren't there also forces of repulsion between the Na+ atoms (look diagonally between the grey atoms)? Likewise ...
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3
votes
1
answer
382
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What is the effect of dissolving ammonia in water on hydrogen bonding?
Hydrogen bonding exists between $\ce{NH3}$ molecules. When $\ce{NH3}$ is dissolved in water, I know that hydrogen bonds are formed between $\ce{NH3}$ and $\ce{H2O}$ molecules. However, do the $\ce{NH3}...
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3
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Why do atoms make bonds? [duplicate]
I have been studying chemistry for a long time in school till now, but, what I recently realised I do not understand is why do atoms really make bonds, why do they want to gain or lose electrons or ...
- 15
0
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2
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375
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How are intermolecular forces between non-metallic substances affected when the substance is heated to its melting point?
I have 3 main questions that I am unsure of:
Are intermolecular forces acting simultaneously causing attraction between particles in a sample of a substance?
Example: Hydrogen bonding and dipole-...
- 11
5
votes
1
answer
288
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Why are steric effects repulsive?
Normally, I think about orbitals interacting in the context of bonding. When two atomic orbitals overlap, they can do so in-phase or out-of-phase. The in-phase overlap results in a bonding molecular ...
- 101
4
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1
answer
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Strength of the hydrophobic interaction
How strong is the "hydrophobic force"?
Hydrophobic interactions are weak interactions but can have greater strength than hydrogen bonds. I find the strength of the hydrogen bond in ...
- 65
6
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2
answers
127
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What repulsion keeps non-hydrogen atoms at a distance: between inner shells or between nuclei?
Bonded or not, when two atoms or ions come closer than the bond distance or the van der Waals distance, the energy increases drastically. What is the underlying cause of that repulsion?
The repulsion ...
- 42.3k
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1
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How can we find out the type of bonding present in a compound or a molecule?
For example, if the bonding in diamond, ice, MgO or CO2 is to determine, how can I find it out? How to determine van der Waals forces?
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1
answer
72
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As you heat up a substance will it's bonds begin to dissipate?
As you heat something up does it slowly start to dissipate? Water, for instance, boils at 100 degrees Celsius, but if you are heating it up at 90 degrees will its bonds be weaker?
- 21
0
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1
answer
529
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dipole–dipole interactions: OCR Sample Paper wrong? [closed]
I was doing OCR A Level Chemistry A, H432/01 Periodic table, elements and physical Sample Question Paper.
Question 6 was:
The boiling point of hydrogen bromide is –67 ºC.
The boiling point of ...
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1
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0
answers
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Is the 12-6 Lennard Jones potential a good description of van der Waals interaction energy?
It seems to me that the Lennard Jones potential oversimplifies the more complex nature of van der Waals forces. However, in most of the MD simulation package, this is generally accepted.
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2
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514
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What would be the intermolecular forces between the molecules of methanetetrol?
Methanetetrol has the following chemical formula: $\ce{CO4H4}$. It is also referred to as orthocarbonic acid.
Since the molecule has a molecular geometry of a tetrahedron, similar to that of a ...
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0
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0
answers
195
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Experimental bond lengths and binding energies of diatomic molecules
Is it possible to find the experimental values of the bond length and the binding energy of the diatomic molecules $\text H_2$, $\text{Be}_2$, and $\text{Ar}_2$ in one source?
I found a lot of ...
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1
vote
1
answer
556
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Are intermolecular forces a type of chemical bond?
My chemistry teacher told me that chemical bonds are of two types: intramolecular and intermolecular. He said that intermolecular forces come under the category of intermolecular chemical bond.
I ...
- 509
1
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2
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If we start heating a substance, does it melt when we break its intermolecular bonds? [closed]
I was reading the 2 following posts:
Do substances melt when we break their intermolecular bonds?
Is melting/boiling point of ionically bonded substance higher than of covalently bound?
Altough ...
1
vote
0
answers
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Chemical bonding [duplicate]
How do we compare the strength of permanent dipole permanent dipole (PDPD) interaction? Is it by bond polarity?
Since H-X (where X is halogen) is polar, and for bond polarity (PDPD bond strength): ...
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17
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1
answer
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Why is the melting point of PCl3 less than that of PCl5?
From just the IB chemistry bonding chapter information, you would normally deduce that $\ce{PCl3}$ and $\ce{PCl5}$ are both covalent molecules.
However, as $\ce{PCl3}$ has a dipole moment, it has ...
- 299
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1
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Strength of Dipoles, Covalent bonds and H-Bonds
My textbook says:
Dipole-dipole forces are 1% as effective as covalent bonds and the strength of a hydrogen bond is generally twenty times less than that of a covalent bond.
What do these ...
- 141
1
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1
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519
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Difference between Force Field and topology, and other related questions
I am performing some Molecular Dynamics computer simulations and I am learning about the various Force Fields (FF) such as OPLS-AA, OPLS-UA, AMBER, etc.
Many things are still unclear to me. I put ...
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2
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0
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Work to overcome adhesion of a liquid to a solid
I'm interested in the van Der Waals force of a liquid adhered to a solid. For example, if you spray some water on a vertical piece of glass, the little droplets with adhere to the window rather than ...
- 1,690
2
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2
answers
1k
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Placing oxygen molecule into electric field
I am trying to understand what happens inside various types of air ionisers.
Some of them are sold for their purported health effects (which I do not want to discuss here), another type are used in ...
- 137
0
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2
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71
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Why are bonding interactions so much stronger than interactions of other types?
Why are bonding interactions so much stronger than all the other types of interactions like dipole-dipole, London dispersion, hydrogen bond etc. even though they are all of electromagnetic origin?
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Intermolecular Forces in Teflon vs Polyethylene
From Wikipedia, polyethylene has a melting point of around $400K$, while Teflon (polytetrafluoroethylene) has a melting point of $600 K$, which is much higher. Besides the increased London Dispersion ...
- 1,620
1
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1
answer
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Why do self-replicating molecules dissociate?
I am new to chemistry (have only done a GCSE) so I apologize for my lack of knowledge. But I am confused about why self-replicating molecules dissociate.
It is my understanding that a self-...
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0
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6k
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What are the intermolecular and intramolecular forces between Hg molecules/ atoms in liquid mercury? [duplicate]
Mercury is the only metal that is liquid at room temperature.
I know that metallic bonding exists between metal atoms but my knowledge is limited to metallic bonding found in solids. Will there be ...
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4
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1
answer
644
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Bending of water and methanol towards a charged objects
I just had a question about why does water, methanol or any other polar substances tend to bend towards the charged object.
I think it is because of a slight dipole dipole movement between the ...
- 350
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1
answer
415
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Why do dianions (such as malonate) bind cations more strongly than anions?
Why does a dianion (such as malonate) bind cations more strongly than its equivalent anion (acetate)?
Is it simply because of the proximal availability of another $\ce{O-}$ group that can bind to ...
- 339
2
votes
1
answer
269
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Is there a clear distinction between the various intra- and intermolecular interactions?
Wikipedia lists dipole-dipole, hydrogen bonding and Van der Waals under intermolecular interactions, and hydrophobic, ionic and covalent under intramolecular interactions.
Is there a clear ...
- 4,285
2
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1
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Bond Angles and intermolecular interactions
It's fun to consider bond angles of molecules in isolation. For example, what is the number of different bond angles exhibited by the most polar form of $\ce{SIBrClF2}$?
However, can bond angles ...
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1
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4k
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What is the difference between a bond, force, and interaction?
I am trying to explain why some solids are more soluble in water than others.
So the energy released from the formation of bonds between the solid solute molecules and water molecules compensate the ...
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6
votes
2
answers
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Why don't molecules of ionic compounds exist?
My book says:
As single ions of a metal are not associated in the solid with single ions of a non metal, separate units of ionic compounds do not exist. It is, therefore, wrong to talk of a ...
user4973
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2
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Determine which molecule has stronger intermolecular force?
SiH4 and CH4
The only intermolecular force they both have is London Dispersion forces
Strength of LDF is determined by molar mass
molar mass of SiH4 = 32.132
molar mass of CH4 = 48.42
Therefore ...
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votes
1
answer
7k
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Do metallic bonds contain London dispersion forces?
On our chemistry exam, a question asks "Which force is present between Fe particles? a) Van der Waals b) Metallic"
At first it seemed obvious that it was metallic; however, upon closer reading, it ...
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