The forces, either attractive or repulsive, that exist between molecules due to electric charge.

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Structures present in liquid water

I know this may be a too generic question, but here it goes anyway. It is already know that solid water (ice) organizes its molecules in a lattice (in a variety of 16 different crystals and one ...
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73 views

How are pencil marks “adhered” to the paper?

Pencils create marks by physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. Wikipedia Normal paper is mainly composed of cellulose ...
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53 views

the strongest intermolecular forces between hydrogen bromide and potassium permanganate? [closed]

the strongest intermolecular forces between $\ce{HBr}$ and $\ce{KMnO4}$? Is $\ce{HBr}$ polar nonpolar or ionic? how about $\ce{KMnO4}$?
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What's the reason for discrepancy between DFT calculated image and NC-AFM-acquired one in this article?

Looking at the images in this article, I've noticed that the molecule electron density images showed as calculated via DFT look very symmetric, while those obtained by NC-AFM appear somewhat ...
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38 views

Entanglement of large molecules

In many textbooks and chemistry curricula, we can see the description of large molecules (particularly in the discussion of hydrocarbons and other nonpolar compounds) as having "entanglement." ...
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60 views

Why does capillary action occur better in narrow tubes than in wide tubes?

We all have seen the meniscus of a small graduated cylinder in the lab. The reasons for the occurrence of capillary action are clear, but why does it occur more profusely in smaller-rimmed containers? ...
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34 views

Halogen bond definition

I was looking for an accurate definition of halogen bonding. I was able to find quite a few good ones, but none of them would explain if a X---H intermolecular interaction would count as a form of ...
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82 views

Factors of London Forces

In class we learnt that the London forces become stronger as the relative molecular mass increases. Not just as in organic chemistry but in things like the halogens. However, as I understand, the ...
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36 views

how protons(H+) react with matter and cause the solution to be acid?

For example if my hands were put in a HCl solution how does the protons in the solution which in high amounts will interfere/react with my hand(skin->proteins..) and cause it to burn...or how protons ...
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207 views

How do I figure out the relative polarity of organic compounds?

It's a question on my quiz which I guessed right and couldn't do the reasoning: Based on the intermolecular forces, predict the boiling points of the following substances and list them in the ...
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2answers
213 views

Intermolecular forces in Carbon Nanotubes?

What are the intermolecular forces that can be found in Carbon Nanotubes?
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33 views

Finding physical properties of epoxide groups

I have a project (12 Chemistry) that asks to talk about the physical properties of epoxide groups. This includes the boiling/melting point of epoxides as well as what intermolecular forces are at play ...
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508 views

Does hydrogen bonding only occur between water molecules?

Does hydrogen bonding only occur between water molecules? Is the dipole-dipole intermolecular interaction know as hydrogen bonding because it is between water molecules, or is called that because of ...
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66 views

How does sugammadex (a modified cyclodextrin) draw rocuronium into its lipophilic cavity?

Sugammadex is a modified cyclodextrin: 8 member sugar ring with carboxyl thioether extensions. Rocuronium is an aminosteroid, 4 steroid rings and one protonated amine group. Sugammadex binds ...
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70 views

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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2k views

Which compound has the highest melting point?

Which of the following compounds has the highest melting point : $\ce{PCl5}$, $\ce{H2O}$, $\ce{NaCl}$, $\ce{SrCl2}$, $\ce{CaF2}$? I've asked a question concerning the boiling points and I got an ...
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4k views

arrange these compounds: CO2, CH3OH, RbF , CH3Br in order of increasing boiling points

I think I should consider the forces berween them that is: CO2: dispersion forces RbF: dispersion and ionic forces ch3oh: Dipole-dipole interactions, Hydrogen bonding and disperaio forces ...
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106 views

Structure of fluoroalkylsilane

I want to use FAS (fluoroalkylsilane) in my molecular dynamics study. How can I find it's real structure? So that I can find proper forcefield for simulating the molecule. It would be very nice if you ...
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613 views

is this statement always true? : The more -OH functional groups in the molecule, the more is its viscosity

Is the following statement always true? The more $\ce{-OH}$ functional groups in the molecule, the more is its viscosity? I think it is true, because it is known that weak intermolecular forces ...
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586 views

Why doesn't the viscosity of water change much with temperature like it does for other substances?

I would like to know why water doesn't ever become like syrup before it freezes when many other liquids, such as hydrocarbons, seem to have a more gradual change from becoming more viscous and then ...
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72 views

Van der Waals Radius clarifications

I just read about van der Waals radius and had some questions about it. Would it be correct to say that in general, van der Waals radius decreases as we move from left to right in the periodic ...
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1answer
114 views

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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1answer
631 views

Why do ionic substances with higher lattice energies tend to be less soluble in water than substances with lower lattice energies

I understand that that energy is required to overcome intermolecular forces holding solute particles together in the crystal but I don't understand how this relates to lattice energies and its ...
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89 views

Homoassociation and Acid Strength

I understand that the strength of HF differs significantly depending on the concentration. I understand the basic theory behind this - homoassociation - and stabilization of the highly negative charge ...
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38 views

How would you know if … is H-Bond or Perm Dipole or Induced Dipole?

For example like HCl, why isn't it a Hydrogen Bond?
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433 views

Natural Bond Orbital (NBO) analyses: Physical significance/interpretation of E(2) 'stabilization energy'?

PREFACE: I am no expert on this topic. My questions at the bottom may be off base. I have some experience with symmetry-adapted perturbation theory (SAPT) when it comes to analyzing intermolecular ...
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39 views

Why is mass proportional to the strength of a dipole-dipole attraction? meaning more mass more strength [duplicate]

I don't understand why the mass of a molecule make it attract more to other polar molecules.
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552 views

What's the relationship between Van der Waals forces and hydrophobic interactions?

A question on a past exam for a course I'm studying for asks: What's the relation between Van der Waals forces and hydrophobic interactions? From what I understand, Van der Waals forces are ...
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7k views

What type of intermolecular forces will dominate Diethyl ether?

Is Diethyl ether (also known as ethyl ether) a polar molecule? What type of intermolecular forces dominate it? Dipole-Dipole Interactions, London Dispersion Forces or Hydrogen Bonding? Please Explain. ...
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591 views

Why Tetrachloromethane has a higher boiling point than Trichloromethane?

London Dispersion Forces are present in all either polar or non polar molecules. Molecules also exhibiting Dipole-Dipole Interactions (in addition to the LDP) must have stronger forces of attraction ...
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205 views

Why Isodecane (B.P.: 327 *C) has a higher boiling point than decane (B.P.: 174.1 *C)?

Branched chain molecules have lower boiling point than straight chain molecules because branched chain molecules have a smaller surface area where they can be attracted by other molecules. Then, why ...
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1k views

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 ...
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394 views

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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113 views

Why Ionic compounds dissolve into water

First, I would like to say that I understand the basic idea of disassociation and solubility. However, as I study intermolecular forces I feel like this basic Idea is being challenged. My ...
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660 views

Why does SiF4 have a higher melting point than SF4?

So looking at the Wikipedia pages of sulfur tetrafluoride and silicon tetrafluoride, the melting points are -121 °C and -90 °C respectively, and so $\ce{SiF4}$ has the higher melting point. However, ...
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234 views

van der waals nonspecific interaction definition

Every definition I see of Van der Waals interactions claim that they are short-range, nonspecific interactions between two chemical species. What does "nonspecific" mean in this context?
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194 views

Intermolecular forces in secondary amines compared to primary amines

Secondary amines form hydrogen bonds, but having nitrogen in the middle of the chain rather than at the end makes the permanent dipole on the molecule slightly less. The lower boiling point is due ...
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106 views

Hydration of lithium salts

Why are lithium salts heavily hydrated? I am not able to understand this because I feel salts of larger cations like Caesium should be more hydrated because of the larger size, they can able to hold ...
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75 views

Reason for vibration of molecules

Why molecules of a body exhibit vibrational motion ? Is it due to interaction between various molecules of the body or inter atomic interaction of the same molecule? If it is because of any of them ...
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2answers
439 views

How does molecular structure affect physical properties?

The question sounds vague and non-specific because my background in chemistry is limited to undergrad college courses. However, I am interested in learning the correlations between the atom-by-atom ...
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1answer
92 views

Which d-orbitals split according to CFT?

According to CFT, the degenerate d-orbitals split into $eg$ and $t_2 g$ groups. Are these the outermost nd orbitals which are vacant(4-d in case of 4th period) or the penultimate filled (n-1)d ...
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4k views

How to determine whether a compound is gas or liquid or solid?

My book says, methyl chloride, methyl bromide, ethyl chloride and some cholorofluromethanes are gases at room temperature, whereas higher members are liquids or solids. Why? With this question, I ...
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1answer
93 views

Coarse-grained force field for ion–water interactions

I want to simulate, at a very coarse grained level, the interaction of water molecules with metal ions, specifically Calcium and Potassium. Is there a standard force field for this. I was told to use ...
3
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157 views

Gold nanoparticles in a water/oil environment

I am currently investigating the assembly of gold nanoparticles in a mixture of water and oil. The thing is the following: If we have gold nanoparticles (35nm diameter) dispersed in water and we put ...
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2answers
1k views

Why do molecules having a higher $M_r$ have stronger inter-molecular forces?

Why do molecules like alkanes with higher molecular mass ($M_r$) have stronger inter-molecular forces? For example, methane ($\ce{CH4}$) has a weaker intermolecular force than pentane ($\ce{C5H12}$). ...
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224 views

Why are the vinylic bonds in alkenes slightly polar?

when searching in the internet about why are alkenes more polar than alkanes (but still they are non-polar), they are always saying that the double bond is more polarizable , i understood the whole ...
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1answer
123 views

Questions about intramolecular interactions in AMBER forcefield

I am trying to run a molecular dynamics simulation with AMBER forcefield. However, it's the first time I use is, and while I know the form of the various intra- and intermolecular energy terms, some ...
2
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1answer
730 views

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 ...