All Questions
Tagged with hydrogen-bond water
33
questions
24
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5
answers
67k
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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 $...
- 819
24
votes
4
answers
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Which has stronger hydrogen bonds: water or ice?
As ice is the solid form of water and it has more hydrogen bonds than water because its oxygen atoms are precisely tetrahedrally positioned and each oxygen is hydrogen bonded by four neighbouring ...
- 379
8
votes
1
answer
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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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- 409
8
votes
1
answer
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Why is density of water maximum at 4 degree celsius?
Why is density of water maximum at 4 degree celsius?
We were having a discussion to this question in class and I could gather the following points.
1) $H_2O$ exists in a cage like structure in ice ...
- 4,197
7
votes
1
answer
3k
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Is a temperature decrease required for hydrogen bonds to form in water?
As I understand it, increasing the temperature of water causes hydrogen bonds to break. Does this mean that a decrease in temperature is required for the formation of those hydrogen bonds?
- 1,005
7
votes
2
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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 ...
- 91
7
votes
1
answer
3k
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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 ...
- 109
7
votes
0
answers
198
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How does the accumulation of hydrogen bonds affect individual bond strength?
I saw the question, "Is the strength of hydrogen bonding greater in hydrogen peroxide or water?" and it made me think of a question on hydrogen bonding:
If an oxygen on a water has a ...
- 6,801
6
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3
answers
18k
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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 ...
- 485
5
votes
1
answer
2k
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Halflife of hydrogen bonds
Related: Covalent Bond/Hydrogen Bond
What is the half-life of hydrogen bonds in a glass of water at room temperature, say 18 degrees Celsius? I guess values may be different for distilled water and ...
- 153
5
votes
1
answer
838
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Is the surface of glass a fine layer of silanol?
Today we learned in class through a vivid demonstration that water sticks to glass. We were then taught that water sticks to glass because while glass is mainly composed of silicon dioxide, the ...
- 51
5
votes
1
answer
189
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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 $\ce{H2O}$ ...
- 153
5
votes
2
answers
3k
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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 ...
- 1,782
4
votes
1
answer
10k
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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 ...
- 151
4
votes
1
answer
6k
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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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