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Questions tagged [sublimation]

The process of a substance transitioning from solid to gaseous phases, and vice versa.

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Calculate Gibbs energy of dinitrogen pentoxide using its vapor pressure and sublimation

I am having trouble with the following problem: Dinitrogen pentoxide, $\ce{N2O5}$, is a solid with a high vapor pressure. Its vapor pressure at $\pu{7.5 °C}$ is $\pu{100 mmHg}$, and the solid ...
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Why is sublimation considered a zero-order process?

In my Chemistry book, it states that sublimation is normally a zero-order reaction or process, as the concentration of molecules that have sufficient energy to sublime is limited by the solid's ...
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Can a solid have a vapor pressure without the ability to sublimate?

Does sublimation occur when a solid turns into a gas and THEN vapor pressure is produced or does the solid first have a vapor pressue and then when the vapor pressure of the solid equals the ...
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How to calculate the enthalpy of fusion at a different temperature?

The heat capacity of liquid iodine is $80.7$ $\ce{J*K^{-1}*mol^{-1}}$, and its enthalpy of vaporization is $41.96$ kJ $\ce{*mol^{-1}}$ at its boiling point ($184.3$ $\ce{^oC}$). Furthermore, the ...
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Lyophilization Advantage

I've been reading about freeze drying and how it increases the shelf life of certain foods and is overall a good preserving technique. My question is with regard to the actual process. I understand ...
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Calculate Heat of Atomisation [closed]

What is heat of atomisation of P4O6(s) Given heat of sublimation of P4O6 is x kJ/mol & P–O bond energy is y kJ/mol. What is heat of atomisation of P4O6(s) Given heat of sublimation of P4O6 is x ...
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Why does the gas from dry ice flow down?

I am reading Dan Broughton's answer in replying to the question "why does the gas from dry ice flow down" here. According to the answer, the fog is water's color and water is condensed and suspended ...
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Is there a method to recover camphene from sublimation at ambient conditions?

Camphene solidifies and sublimates at ambient room temperature below 45°C. I'm aware that a glass funnel is often used to separate mixtures through sublimation of the volatile component (in this case ...
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Why does CO2 only exist in gaseous and solid state under STP/SATP?

Why does carbon dioxide only exist in gas and solid state under STP/SATP conditions? $\ce{CO2}$ pressurized to $\pu{5.1 atm}$ can exist in all 3 states: solid, gas, and liquid. However, why couldn't ...
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What are the side effects of adding dry ice to a swimming pool?

My apartment complex pool was closed today due to a resident dumping a large quantity of dry ice into the pool. In the notification from my landlord, they stated: Dry ice is frozen carbon dioxide ...
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Why liquid CO2 change to solid, when lowering pressure?

I did an experiment in class. Making liquid $\ce{CO2}$, which is very easy: put dry ice in tube, and lock the tube. I could see liquid $\ce{CO2}$, then I unlocked the tube(pressure down), and liquid $...
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Why does the crystal sublime more quickly at the corners where there is a higher vapour gradient?

The crystal responds to the larger vapor gradients near the edges by sublimating faster there and thus rounding the crystal. J. Nelson, J. Atmos. Sci., 1998, 55, 910-119. The change in shape ...
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Nucleophilic Substitution Reactions help

Which halogenoalkane reacts fastest with sodium hydroxide? A. 1-iodobutane B. 1-chlorobutane C. 2-chloro-2-methylpropane D. 2-iodo-2-methylpropane Iodine has a larger radius, thus less ...
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Does naphthalene in moth balls really sublimate or does it evaporate?

The triple point of naphthalene is $\pu{-56 °C}, \pu{1.05 kPa}$ (which is much less than $\pu{1 atm}$). So how can a naphthalene ball sublimate at $\pu{1 atm}$, when considering that its melting point ...
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Is it correct to say that SOME iodine undergoes sublimation at 1 ATM

The triple point of Iodine occurs at 0.12 atm and at standard temperature it is a solid on the phase diagram. I understand that therefore, when heating iodine at 1 atm, it (at least some of it) will ...
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What are disadvantages of using sublimation vs. recrystallization as a method of purification?

I can only think that a small sample can be sublimed while a bigger sample size can be recrystallized. Are there more?
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I suspended iodine over steel nails. What are these droplets that formed?

I suspended about 15g of iodine crystals over a couple of nails to see how quickly they would begin to rust. After a week, these droplets had formed. When prodded they broke apart like water drops. ...
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Sublimation and recrystallization of caffeine

I'm looking to do an extraction of caffeine from energy drinks. I want to use both sublimation and recrystallization in my experiment for advanced purity. My question is which should happen first, ...
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Vacuum at different altitude

I have tried to find this searching the internet and I am not sure if I understand it. I want to turn water from solid to gas without going into the liquid phase - Sublimation. The altitude above sea ...
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Can water sublimate at higher pressures

I would like to know if water can sublimate at a higher pressure? I am not a chemist and do not know what to call it exactly but here is what I have. My goal is to freeze dry coffee. I have an ...
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Sublimation of Iodine from Iodine Povidone

Iodine povidone is a complex of iodine and the polymer povidone. I am wondering if one were to heat it enough, the iodine would sublimate and could be collected. Normally iodine boils at 184.3 °C, ...
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What is the lowest temperature tungsten starts sublimating at?

What is the lowest temperature tungsten starts sublimating at? I've tried to search in Google but without any luck. For example, $\ce{WO3}$ starts sublimating roughly at $\pu{550 °C}$, according to ...
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Equilibrium saturation/depostion rate calculation

I found the Knudsen/Langmuir equation for calculating the sublimation rate of a solid. If I have a closed system, once the vapor reaches the saturation pressure, the solid will continue sublimating ...
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What is this glassware?

I found this in a second hand store, and I think it has to do with freeze drying. Is there any validity to this assumption? What is this called? Also, the little tuberculina at the bottom are stuffed ...
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How to create liquid carbon, and what kinds of properties does it have? [duplicate]

Carbon sublimes at about 3915K. In a high pressure environment, shouldn't it be possible to create liquid carbon at high temperatures? Has this ever been done? What does it look like and what ...
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Why does dry ice “dissolve” so quickly in water?

I just stumbled across an ancient video of some people putting a 60 pound block of dry ice in a swimming pool. Pretty cool stuff. It's pretty interesting to me that in the video, the dry ice ...
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Sublimation of Iodine

Why does iodine sublime? I have researched it myself and I have got the same answer; it sublimes because it directly converts from solid to gas. But why don't bromine or chlorine also sublime?
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If you can smell something does that mean that this thing loses molecules?

When you can smell something there must be some molecules in your nose which signalize the smell in your nose. Does that mean, that e.g. a cheese is losing molecules which fly into your nose? And does ...
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Drying Clothes Outside Below Freezing

It is commonly accepted that you can hang your wet clothes outside to dry even when the winter temperature is below freezing. It is mentioned here http://grist.org/living/ask-umbra-can-i-line-dry-my-...
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How fast will hydrazine boil out of a tube into a vacuum?

For context I'm talking about ISEE-3 and how long it would take to dump the now useless and hazardous fuel it still carries. Given a heated tank of hydrazine (somewhere near $0~^\circ\mathrm{C}$) ...
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Is sublimation a property of all substances?

I wonder if sublimation can be done only on certain substances like iodine, or it can be done on all substances. In other words, can sublimation be done, for example, on water? If it cannot, then why?...
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Is sublimation caused by an environmental difference or an element's composition?

I was having a conversation when the topic of sublimation came up. Prior to the discussion, I had always thought that sublimation was caused by a great pressure/temperature difference, but another ...
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Which elements have no liquid form at atmospheric pressure?

Carbon has no liquid form at atmospheric pressure. Is this unique amongst naturally occurring elements? The more interesting and vague question is, is this property somehow important or related to ...
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What is known about liquid carbon?

The wiki tells me that if you heat carbon at atmospheric pressure it eventually turns directly into a gas without being liquid first. At what pressure can you make liquid carbon? Has anyone actually ...