All Questions
Tagged with hydrogen-bond water
33
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How do water molecules overcome the van der waals distance and form hydrogen bonds?
I read in Voet & Voet that the hydrogen bonds are at least 0.5 angstrom shorter than the calculated van der waals distance. As I understand, van der waals distance is the distance of closest ...
6
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Why is ice less dense than water?
I know the traditional explanation, which says that ice has large spaces between $\ce{H2O}$ molecules because hydrogen-bonding gives it an open structure. But what does the open structure have to do ...
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2
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Can 1 gram hyaluronic acid really hold 6L of water?
According to this study (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3970829/), they make an (uncited) claim about hyaluronic acid: "One of its most important properties is that it can attach and ...
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7
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Water and Ice - density
We know that ice has a lower density than water despite both having the same [molecular] mass. I know that as water turns to ice, it expands. As far as I was taught, I know that it has something to do ...
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Water hydrogen bond [duplicate]
In my book it states each water molecule can hydrogen bond to 4 other water molecules. However, it does not state why this is? Why is it 4 molecules and not 3? Is this related to the electron ...
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Explain volume contraction in mixtures of alcohol and water
Could someone explain why volume contraction occurs when you mix an alcohol such as ethanol with water in relation hydrogen bonding and the dipole-dipole forces?
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Are there any other elements that get less dense in their solid state?
I was learning about how water, because of its hydrogen bonds, actually gets less dense as it goes into its solid state - I was just wondering, what other elements do this? Are they similar to water?
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Does clay absorb water because of polarity?
From what I have recently learned about ceramics, clay is essentially sheets of silicon and oxygen, bonded by covalent bonds. Between them, water keeps clay from forming a full lattice of $\ce{SiO4^{2-...
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Does hydrogen bonding contribute in solubility of a substance
If a compound can't hydrogen bond with itself but can hydrogen bond with the water, why does it still remain immiscible?
Take for example ethoxyethane. It can't hydrogen bond with itself but its ...
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1
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What is a hydrogen bond?
I was doing a little research on the Chemistry of water, and it said that water molecules have a hydrogen bond between them. What is it, and what does it do to water?
user29151
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Specific Heat Capacity of Heavy Water
Water has an unusually high specific heat capacity due to it's hydrogen bonds.
Why is it that the change in isotope causes a 10% difference in the heat capacity? How does the added neutron in the ...
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How does a water molecule bond to an anhydrous salt to form a hydrate?
Some sites suggest that water molecules bong to anhydrous salt via a "loose bond". What does that even mean? $\ce{H2O}$ is a polar molecule and salts are made up of ionic bonds. Is it a hydrogen bond ...
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Why does hydrogen fluoride have a boiling point so much lower than that of water?
$\ce{F}$ has more unshared electron pairs and is very electronegative, so $\ce{H}$ of another $\ce{HF}$ molecule can $\ce{H}$-bond with it.
$\ce{HF}$ has normal boiling point of $\pu{19.5^oC}$ while $...
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1
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Hydrogen bonding
It is mentioned in my textbook:
"Hydrogen atoms of water molecule create strong electrical field due to their small sizes"
How is the size related to electrical field and its strength?
A little ...
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Theoretical model for the hydrogen bond
I am curious how, from the perspective of quantum chemistry, the hydrogen bond is modeled. In particular I am interested in using such a model to estimate the amount of energy released per $\ce{H2O}$ ...
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