Questions tagged [boiling-point]

The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid

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1answer
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Melting points and boiling points of primary alcohols do not follow the same trend

If one considers boiling points (in °C) of primary alcohols, one finds the following: methanol: 65 ethanol: 79 1-propanol: 97 1-butanol: 117 1-pentanol: 138 This trend is due to Van der Waals forces ...
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3answers
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Why are the boiling points of aldehydes less than those of ketones?

Both aldehydes and ketones have a carbonyl group, but since the carbonyl group of ketone is between alkyl groups, wouldn't it be more difficult for it to form hydrogen bonds than aldehydes? Why then, ...
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1answer
201 views

Boiling points of v. similar organic molecules

Given the similarity in formula between pentane ($\small\ce{CH3(CH2)3CH3}$, b.p. 36.2 °C) and neopentane ($\small\ce{C(CH3)4}$, b.p. 9.5 °C), why are their boiling points so different?
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Which among phenol and 1,2-dihydroxybenzene has the higher boiling point?

My attempt Based on symmetry: I think that looking for symmetry phenol has a higher boiling point than 1,2-dihydroxybenzene because the two -OH groups projecting out from the benzene ring of 1,2-...
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1answer
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At what temperature will proteins and fats boil in a vacuum?

A question was asked on another stackexchange site: This is not nice perspective, but eventually it will happen. An astronaut falls out of spaceship because of damage caused by collision with other ...
4
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1answer
843 views

Calculate Ethanol content after heating for N minutes

Does there exist a formula I can use to calculate alcohol content of a solution after heating it for some time? I have the following use-case: I am making a pecan pie. I have a thick sugary solution. ...
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1answer
20k views

How to determine the order of boiling points and solubilities for (chloro-)alkanes, ethers, aldehydes, and alcohols?

How to determine the order of boiling points and solubilities for (chloro-)alkanes, ethers, aldehydes, and alcohols? What rules can be applied to make these choices? Take for example the following ...
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1answer
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Boiling and Melting point of Lithium (or any other element that does not occure in free state)

The melting and boiling point of Lithium as compared to other members of the Alkali group metals is high. But, Lithium does not occur in the free state. So, what does it mean that it has high ...
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1answer
5k views

Why does the boiling and freezing-point of non-polar molecules rise with increasing molecular mass?

In the section about fuels, my textbook mentions that the boiling and freezing-points of alkanes (which are non-polar) increase with an increase in molecular mass due to London dispersion forces. ...
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4answers
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Will gaseous ionic compounds be free moving ions?

I knew while learning about electrolysis that if the ionic compound is molten it becomes free moving ions. If that is the case, what will happen if I continued heating till it reaches the boiling ...
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2answers
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Boiling point of vodka

What is the boiling point of vodka? I have found the boiling point of ethanol, ~173 (degrees) F. However, I am unable to find the boiling point of vodka. I found some information on it, but I do not ...
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Why do different substances have different boiling points?

For example, why does for example oxygen turn into gas at a much lower temperature than water? Does it have anything to do with the molecular structure? A water molecule does have a more complex ...