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Questions tagged [phase-diagram]

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3 answers
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Why do we have water vapor at room temperature and atmospheric pressure when water is a compressed liquid at these conditions?

At room temperature and 1 atm pressure liquid water should be a compressed liquid. Now if that is the case then why do we have water vapor at these conditions? I can't make sense of this based on just ...
chem_101_102's user avatar
2 votes
0 answers
49 views

Phase diagram of ammonium hydrosulfide, a volatile salt

Salts (ionic compounds) usually have low volatility due to the strong ionic bond. However, there are exceptions. Smelling salts decompose and release ammonia gas. What is "volatile"? If a ...
Kevin Kostlan's user avatar
8 votes
1 answer
305 views

Do all three states need to be present at triple point?

A recent United States National Chemistry Olympiad question asked the following: Which statement best describes a sample of ammonia at equilibrium at its triple point (195.4 K, 0.0606 bar)? A) ...
unstable's user avatar
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-2 votes
3 answers
118 views

Interpretation of a Phase Diagram

I am a bit confused about the correct way to interpret a phase diagram. I was told that the line separating the liquid and gas phases gives the vapor pressure of the liquid substance as a function of ...
Johnny Smith's user avatar
0 votes
1 answer
43 views

Phase Diagram Vertical Lines

We had to create a phase diagram of H2O and NaCl. My professor mentioned that the vertical line I’ve encircled is at the weight % of 61.9. I was just wondering if this is proven through experiment or ...
chemstudent's user avatar
1 vote
2 answers
126 views

Why do reduced variables for gases use their critical constants?

I understand why it's useful to have reduced variables, especially as it is the basis for the theorem of corresponding states. However, I'm having a hard time understanding why the critical constants ...
chemN00b's user avatar
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-3 votes
3 answers
103 views

How salt helps to melt ice even when there is no dynamic equilibrium between water and ice?

I am a high school student and I am confused about freezing point depression. We say that when in winter's it gets even colder than normal freezing point Temperature then we use solute to melt ice ...
Virender Bhardwaj's user avatar
1 vote
0 answers
69 views

Searching for a phase transition dataset for substances

Disclaimer: I'm not a chemist, just a curious engineer. As per the title, I'm searching for a dataset (or relevant Python library) with phase transition information for different substances. Eg: water,...
sebzuddas's user avatar
1 vote
1 answer
160 views

Gibbs phase rule for azeotrope and Solid-Liquid phase diagram

Azeotrope An azeotrope is a mixture of two or more components in fluidic states whose proportions cannot be altered or changed by simple distillation Applying the phase rule to azeotrope. There are 2 ...
Shira's user avatar
  • 543
0 votes
2 answers
114 views

Enrichment in phase diagram

After my post at UF4-ZrF4 phase diagram (the phase diagram is given below) Question: Consider the coordination (40%; 900oC), the cooling to 850oC would form x(ZrF4) = 0,22. When the cooling ...
Shira's user avatar
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2 votes
1 answer
354 views

UF4-ZrF4 phase diagram

I am doing physical chemistry tasks in Professor Peter Atkins book. The phase diagram of UF4-ZrF4 system that I found is in the following picture Question: Where is the point that the composition x(...
Shira's user avatar
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3 votes
2 answers
249 views

Is there a supercritical state for ice?

I know there is such a thing as a supercritical fluid, where the vapor and liquid phases are indistinguishable, but is there such a thing as a supercritical state for ice? Another way of asking this ...
suse's user avatar
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7 votes
1 answer
434 views

Dewpoint of water in relation to composition of atmosphere

A couple of colleagues and I were talking about the nature of dewpoints, specifically the dewpoint of water in relation to the chemical composition of the atmosphere in a closed space. If I remember ...
Oak Staff's user avatar
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