Questions tagged [hydrogen-bond]

Intermolecular force between covalently bound hydrogen atom and atom possessing a lone pair of electrons.

Filter by
Sorted by
Tagged with
-4 votes
0 answers
22 views

What is the O-H bond energy in water [closed]

What is the O-H bond energy in water considering the following standard enthalpies: O(g), 249 Kj/mol; H(g), 216 Kj/mol; H2O, -242 Kj/mol.
Lorenzo Garcia's user avatar
1 vote
0 answers
31 views

How can we prevent retrogradation of starch?

Are there any additives which can prevent retrogradation of starch? I have prepared 13% of starch solution along with 2% of NaCl. The results were bit better. The synthesized gel was flowable with ...
Aqib Mehmood's user avatar
1 vote
0 answers
44 views

Can Seaweed Be a Thermoplastic?

I was on the Internet, and I saw this post. This post shows a photo of thermoplastic seaweed, which I thought was impossible. ` BTW, if you're wondering what the difference is between a thermoset and ...
Charlie Nicholson's user avatar
2 votes
0 answers
42 views

Source(s) of extreme Raman scattering of FeOOH under intense laser excitation?

RRUFF's Raman spectrum of FeO(OH) as Goethite: Bears no apparent similarity to the extreme Raman scattering of this sample of purported FeOOH under 785nm laser excitation with 100x objective that ...
James Bowery's user avatar
3 votes
1 answer
322 views

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}...
photon's user avatar
  • 59
-1 votes
1 answer
80 views

Diagram of the electric field potential around water

Is there diagram of the electric field around a water molecule. I have seen some simplifications that treat hydrogen as a positive point source and oxygen as a negative point source. But I am looking ...
Q the Platypus's user avatar
-2 votes
1 answer
53 views

Hydrogen bonding of water molecule

When we say that energy of hydrogen bonds in liquid water is $\approx \pu{6.3 kJ/mol}$, does it mean that if we divide this number among $\pu{1 mol} \approx \pu{6.022E23}$ molecules, the result is we ...
user133604's user avatar
9 votes
2 answers
2k views

Why does potassium bifluoride exist whereas bichloride does not?

Why does the reaction \eqref{rxn:R1Q} take place, but the reaction \eqref{rxn:R2Q} does not? $$ \begin{align} \ce{HF(aq) + KF(aq) &-> KHF2(aq)}\label{rxn:R1Q}\tag{R1} \\ \ce{HCl(aq) + KCl(aq) &...
I.Bedi's user avatar
  • 101
3 votes
2 answers
240 views

Can molecular hydrogen form hydrogen bonds?

Basically, I want to know if molecular hydrogen (H$_2$) can form hydrogen bonds with other molecules (CH$_4$, CO$_2$, N$_2$). I'm trying to model the mixture of these molecules with SAFT equations of ...
felipe's user avatar
  • 59
-4 votes
1 answer
139 views

If the 2 electrons of a hydrogen molecule are more likely to be found between the 2 hydrogen atoms, why does this diagram says otherwise?

So I am reading about bonding and antibonding molecular orbitals and i can't understand how does the probability diagram show that the electron density in the sigma 1s molecular orbital is greatest ...
CaptainAmerica Whyso's user avatar
0 votes
0 answers
492 views

How heating of copper sulphate pentahydrate (blue vitriol) can be explained?

The chemical formula of copper sulphate pentahydrate, $\ce{CuSO4\cdot 5H2O}$ does not give information about its true structure because it's only an empirical formula. It forms a network solid. Two ...
Apurvium's user avatar
  • 1,242
-4 votes
1 answer
33 views

What is the determining factor between two potential bond candidates? [closed]

Say you have a vacuum (imaginary, of course) with three hydrogen atoms, how do we determine which two will bond and which one will be left out? If the same energy is present (equally) for the entire ...
m-a-r-c-e-l-i-n-o's user avatar
1 vote
0 answers
39 views

How to calculate absolute charge of a protein [closed]

My understanding is that hydrogen bonds formed by proteins require the NH2 / COOH to be neutral. Hence to find out when the hydrogen bonds are the strongest will depend on the absolute charge of the ...
TheRavenSpectre's user avatar
-2 votes
1 answer
158 views

Hydrogen bond in water vapor [closed]

As the temperature increases and liquid water changes to gas, are ALL the hydrogen bonds broken or they are just weaker?
JH RP's user avatar
  • 17
0 votes
1 answer
82 views

Can flaxseed (linseed) oil undergo hydrogenation?

I'm curious if it's possible to chemically hydrogenate flaxseed (linseed) oil. I've never seen it in hydrogenated form. Given its quality as an excellent wood protectant, I figure it would be easier ...
user148298's user avatar
-3 votes
1 answer
32 views

Difference between number of hydrogen bonds formed and number of hydrogen bonds in a molecule [closed]

I would like to know how to count the number of hydrogen bonds formed in a molecule and the number of hydrogen bonds that a molecule has. For example, water forms two hydrogen bonds with its two ...
user121671's user avatar
2 votes
3 answers
999 views

Can hydrogen fluoride form three or more hydrogen bonds? [duplicate]

As far as I know, each $\ce{HF}$ molecule has two hydrogen bonds, one formed by its hydrogen atom and one which the $\ce{F}$-atom forms with hydrogen atom of a third $\ce{HF}$ molecule. In other ...
user1039203's user avatar
-1 votes
1 answer
146 views

intramolecular h-bonding in maleic acid

While studying organic chemistry, I came across two practice questions given by my professor: Compare the acidic strength of:- Maleic acid and Fumaric acid o-nitrophenol and p-nitro phenol And the ...
Priyanshu Choubey's user avatar
7 votes
1 answer
2k views

How can we explain solubility of hydrogen sulfide in water?

On my most recent high-school chemistry exam I had a longform question where I was supposed to compare the solubilities in room-temperature water under normal pressure of a few molecules. According to ...
BouncyKnight's user avatar
3 votes
1 answer
175 views

Comparison of hydrogen bond strength

Consider the following sets of H-bonds: $$ \begin{align} &\text{P:} &\ce{-O-H\bond{....}N} \\ &\text{Q:} &\ce{-O-H\bond{....}O} \\ &\text{R:} &\ce{-N-H\bond{....}N} \\ &\...
Intermechanic's user avatar
5 votes
2 answers
1k views

Dissolution of sugar in water and its temperature dependence

As far as I can remember, I was taught in 6th grade that warm water would dissolve sugar with greater ease than cool water. In 11th grade, I was taught that Hydrogen Bonding is the reason behind ...
Priyanshu Choubey's user avatar
0 votes
1 answer
132 views

What drives hydrophobic effect/interactions? (multiple choice question)

Water molecules cause hydrophobic interactions because A- they can disrupt surfaces with no hydrogen bonds. B- they prefer to be close to hydrophobic surfaces C- they are restricted in their rotation ...
Abdelrahman Mohamed 's user avatar
0 votes
0 answers
16 views

DI water vs. Tap water in ethanol-water and salt phase change reaction

We did a very simple lab like one you would do in highschool showing that you can seperate the phases of water and ethanol using salt. As simple as it sounds, we could not get it to work no matter ...
Don D.'s user avatar
  • 1
0 votes
0 answers
95 views

What are the necessary conditions for formation of a Hydrogen Bond?

Usually Hydrogen bonds are associated with N,O,F as the atoms involved. In some cases OH---Cl bond is observed as in case of o-chlorophenol. According to the updated IUPAC definition a Hydrogen bond ...
LiQuid_ NitRoGeN's user avatar
0 votes
0 answers
68 views

Why does steam store large amounts of energy?

We all know that steam can be used to perform mechanical work and steam has a high capacity for energy storage. But why does steam have such high energy capacity? I tried searching for answers on the ...
Somanna's user avatar
  • 213
2 votes
1 answer
289 views

Does hydrogen bonding affect the structure of a molecule?

We know an individual molecule of $\ce{H2O}$ has a bent structure, but if we consider a volume of water, then there are many molecules having hydrogen bonding with each other. Due to this, does the ...
tryst with freedom's user avatar
0 votes
0 answers
506 views

Are hydrogen bonds between two hydroxyl groups stronger if one is deprotonated?

Hydrogen bonds can form between two hydroxyl groups. Is the hydrogen bond stronger if one of the groups is deprotonated?
Mario's user avatar
  • 45
1 vote
0 answers
231 views

Do CHF3 and acetone form a hydrogen bond?

I haven't been able to find a reference confirming that fluoroform forms hydrogen bonds with acetone. Do they?
Entropy's user avatar
  • 55
2 votes
1 answer
618 views

What is the reason for the boiling point of benzene-1,4-diol being higher than that of benzene-1,3-diol?

What is the reason for the boiling point of benzene-1,4-diol being higher than that of benzene-1,3-diol? Both have hydrogen bonds. I think it is due to quinol's symmetry but can't point out exactly ...
Robin Singh's user avatar
0 votes
1 answer
238 views

Hydrogen Bonding in case of nitro group [closed]

In many different cases of Nitro group I have seen that only one oxygen atom is particularly used for hydrogen bonding but not the other one.But I guess both the bonds should be polar and hence show ...
Anshu Stackexchange's user avatar
1 vote
2 answers
148 views

Hydrogen Bond Length and Lattice Density [closed]

The subject of the density of solid water is discussed on Physics Stack Exchange in this post. In the post, it is said that.. the way the molecule is angled ensures that a specific (energetically ...
PineappleThursday's user avatar
4 votes
0 answers
103 views

Would the hydrogen-bonded polymer hexaamminecobalt(III) hexakis(trifluoromethyl)cobaltate(III) be soluble in water?

It is clear that both the hexaamminecobalt(III) ion and the hexakis(trifluoromethyl)cobaltate(III) ion are both low spin (the former is already low spin, and the trifluoromethyl ligand is clearly ...
Kanghun Kim's user avatar
8 votes
1 answer
976 views

Does ammonia exhibit hydrogen bonding in its gaseous state?

I was reading the properties of ammonia in my book (NCERT Chemistry Part I, Textbook for Class XII) where it was written : In the solid and liquid states, it (ammonia) is associated through hydrogen ...
ecneics's user avatar
  • 393
8 votes
1 answer
209 views

Out of tropolone and tropone, which is more soluble in water?

According to me tropolone has intramolecular H-bonding, so extent of H-bonding with water will decrease and thus, will be less soluble. Tropone (Cyclohepta-2,4,6-trien-1-one): Tropolone (2-...
ProBro's user avatar
  • 89
3 votes
1 answer
375 views

Which compound of these following have electrovalent, covalent, coordinate as well as hydrogen bond?

Which compound have electrovalent, covalent, coordinate as well as hydrogen bond ? A) $\ce{[Cu(H2O)4]SO4.H2O}$ B) $\ce{[Zn(H2O)6]SO4.H2O}$ C) $\ce{[Fe(H2O)6]SO4.H2O}$ D) $\ce{[Fe(H2O)6]Cl3}$ Answer ...
Ashish's user avatar
  • 1,409
12 votes
2 answers
2k views

Why hydrogen bonding in some acids make them a stronger acid when it is present even before deprotonation?

If we take the example of salicylic acid, hydrogen bonding is present in the acid as follows: Even after deprotonation, it has intramolecular hydrogen bonding as follows: My question: p-...
Neha's user avatar
  • 442
4 votes
1 answer
2k views

Why is Maleic Acid more soluble in water than its trans isomer Fumaric Acid?

My teacher taught me that compounds having intramolecular H-Bonding are relatively less soluble in water as they will not involve in H-Bonding with water appreciably while those able to do ...
Swapnil Kashyap's user avatar
1 vote
0 answers
84 views

Comparing the boiling points of common organic molecules

The order I was provided with is(comparing molecules of similar molecular mass from each); alkanes< ethers< esters< aldehydes< ketones<< alcohols<< carboxylic acids<< ...
harry's user avatar
  • 1,136
0 votes
1 answer
99 views

Which of the following compounds possess more than one percent enol content? [closed]

Which of the following compounds possess more than one percent enol content? I understood that stability of enols are dependent on the hydrogen bonding in the compounds. But here, what is the ...
Bhawana Kanth's user avatar
2 votes
1 answer
174 views

What happens when hydrogen bonds stretch?

I'm researching about the Mpemba effect and I came across an explanation saying that the effect occurs because at higher temperatures, the hydrogen bonds between the water molecules stretch and store ...
prata's user avatar
  • 134
1 vote
1 answer
278 views

How do point mutations affect complementary base-pairing and widths of the nucleotide pairs?

Point mutations are divided into two categories: transitions and transversions. Since point mutations only occur during DNA replication (an integral process of both mitosis and meiosis), the mutated ...
seamos's user avatar
  • 99
0 votes
1 answer
50 views

How to interpret this formula about hydrogen bond energy

I want to evaluate some chemistry related formulas, which I don't understand. In proteins, hydrogen bonding often occurs between the oxo group = O oxygen of one amino acid and the α-amino group (N − H)...
tomitheninja's user avatar
2 votes
0 answers
42 views

Why are Hydrogen bonds directional? [duplicate]

While reading about Hydrogen bonding in a book (O.P. Tandon's G.R.B. Organic Chemistry), I came across a sentence that was mentioned in a rather unstructured way relative to how comprehensive I was ...
Desai's user avatar
  • 451
0 votes
1 answer
966 views

Why is boiling point of Ammonia greater than Arsine?

I have previously read that the boiling point of Stibane(SbH3) is greater than Ammonia(NH3) as ammonia is gas at room temperature and no hydrogen bonding exists in the gaseous form of NH3. Hence, as ...
Aaliya Ahamed's user avatar
-3 votes
1 answer
494 views

Is "Hydrogen Bonding" coordinate covalent bond? [closed]

My textbook says: The Oxygen atom of other molecules links to form coordinate covalent bond with H-atom using lone pair. Now I am confused. Is H-bonding coordinate covalent bond?
Hadia Javed's user avatar
0 votes
1 answer
1k views

How is o-Fluorophenol more acidic than phenol even after having Hydrogen bonding?

Source: Concepts of Organic Chemistry by Dr OP Tandon, Himanshu Pandey, Dr AK Virmani Page no: 241
Nivedita Chowdhury's user avatar
1 vote
2 answers
1k views

Why does hydrogen bonding require a lone pair? [closed]

Why does hydrogen bonding require a lone pair of electrons on the partially negative atom? They would still be partially negative even without the lone pair right? Or does a bond exist, but is much ...
Hayden Soares's user avatar
3 votes
0 answers
80 views

Why ethyl cyanide and propanol have the same boiling point?

As I understand, the intermolecular forces of ethyl cyanide are of van der Waals nature (dipole-dipole) but in the propanol molecule there are hydrogen bonds which are in principle much stronger. Why ...
fich's user avatar
  • 201
1 vote
0 answers
107 views

Hydrogen bonding in acetylene and other terminal alkynes

My textbook says that hydrogen bonding is possible only when there is acidic hydrogen connected to an electronegative atom like $\ce{N}$, $\ce{O}$ or $\ce{F}$ and a basic lone pair of electrons on ...
Adiboy's user avatar
  • 158
-1 votes
1 answer
655 views

Why is Bonding between H and Cl not considered as H bonding? [duplicate]

Cl is an electronegative element and hydrogen is electropositive. Why are intermolecular interactions involving H and Cl not considered as H bonding? I read it in a book but there was no reason given ...
Srijan's user avatar
  • 412

1
2 3 4 5 6