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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Describe with data why NH3, H2O and HF have higher boiling points than might be expected? [closed]

Please help me to answer this question. Describe with data why NH3, H2O and HF have higher boiling points than might be expected?
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How to calculate the boiling point of a solution of eugenol in benzene? [closed]

Eugenol is the active ingredient in the oil of cloves used to relieve toothache. Calculate the boiling point of a solution in which $\pu{0.17 g}$ of eugenol $\ce{C10H12O2}$, is dissolved in $\pu{10.0 ...
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Normal melting point [closed]

Consider the following data for a substance: Critical point: 114.3 atm and 561°C Triple point: 0.108 atm and 114°C Normal melting point: 1.00 atm and 124°C What is the normal boiling point of the ...
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Why do fluoride molecules seem to have abnormally low boiling points?

As far as I know, to non-polar molecules like CF4 and C2H6, boiling point is mainly affected by the London dispersion force. As a result, molecules with more protons and electrons normally have higher ...
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How to find the normal boiling temperature if vapor pressure at any temperature is the only thing that can be usable?

Here is my program for calculating the vapor pressure of the Organic Chemicals using Antoine's Equation: ...
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How to find normal boiling temperature if vapor pressure is known in any temperature?

I can calculate the vapor pressure of the Acetone at any given temperature using the Antoine equation. Is it possible to find the normal boiling temperature of the Acetone? (It has to be done by just ...
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Why does a covalent solid have a high melting point and boiling point as compared to an ionic solid? [duplicate]

Why does a covalent solid have a high melting point and boiling point as compared to an ionic solid? Shouldn't it be less than that of ionic solids since the coulombic forces in ionic solid is ...
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Why is Vapor Pressure of Liquid Equal to Ambient Pressure at Boiling?

What does phase change from liquid to gas have to do with equality of vapor pressure and ambient pressure? I understand that at higher pressures more kinetic energy is needed for molecules in liquid ...
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Why does 1,2-dihydroxybenzene have higher boiling point than monohydroxybenzene? [duplicate]

I studied that any kind of dihydroxybenzene has higher boiling point than monohydroxybenzene, and among the dihydroxybenzenes, I understood that because of inter molecular hydrogen bonding they have ...
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Comparison of boiling points of para-derivatives of phenol

The boiling points of four para-derivatives of phenol are: How can we compare the boiling points of p-nitrophenol and p-aminophenol? Apart from the hydroxyl group, p-nitrophenol has two oxygen atoms ...
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Why do amides have an inconsistent boiling point trend?

For many organic compounds such as alcohols and alkanes, the relationship between molar mass and boiling point is generally linear when graphed. However, amides have a very high boiling point and as ...
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Why do compounds with low polarizability occur as gases at room temperature?

I've read in a textbook that in the fluorine atom, for example, high ionization energy reflects the fact that the electrons are tightly held. Thus compounds containing many fluorine atoms tend to have ...
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Why does a wooden spoon creates bubbles when put in hot oil?

This question might be a bit weird, but I just asked myself why a wooden cooking spoon creates bubbles when put in oil at about 170°C. This is a common trick to find out, if Oil has the right ...
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Why is boiling point of Ammonia greater than Arsine?

I have previously read that the boiling point of Stibane(SbH3) is greater than Ammonia(NH3) as ammonia is gas at room temperature and no hydrogen bonding exists in the gaseous form of NH3. Hence, as ...
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Variation of Boiling point with pressure from Clausius-Clapeyron equation

For a first-order phase transition such as water to steam , we write Clausius-Clapeyron equation as: $\frac{dP}{dT}= \frac{L}{T \Delta V}$ Now what I infer from this equation is that if the phase-...
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Why is the boiling point of sugarcane juice lower than the boiling point of water?

As the boiling point is a colligative property, one would expect that the boiling point of sugarcane juice should be higher than pure water because Sugarcane juice contains water (75–85%), non-...
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Is the average kinetic energy of evaporating water molecules (at room temperature) equivalent to the average kinetic energy of boiling water?

Purpose: On new year's eve, after a splendid red and an assortment of sumptuous repasts, I made a bold remark which, on further consideration, may turn out to be incorrect. Unless! Unless I can ...
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Intermolecular forces of attraction between positional isomers of alcohols

This seemingly trivial question is as follows: Why is the boiling point of 1-butanol ($\ce {117.7 ^\circ C}$) higher than that of 2-butanol ($\ce {99 ^\circ C}$)? The only reason I can think of is ...
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Why does Ethylene Glycol have higher boiling point than Propylene Glycol?

Looking at the two alcohols, both have hydrogen bonding and are singly bonded throughout the molecule. However, propylene glycol has a larger electron cloud which to my knowledge would increase its ...
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Why ethyl cyanide and propanol have the same boiling point?

As I understand, the intermolecular forces of ethyl cyanide are of van der Waals nature (dipole-dipole) but in the propanol molecule there are hydrogen bonds which are in principle much stronger. Why ...
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Why hydrogen bonds are stronger than Van der Waals forces?

Why the hydrogen bonds are more intense than Van der Waals forces in the case where the molecules with the Van der Waals forces have a stronger dipolar moment than the molecules with the hydrogen bond?...
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Can you make n-Hexane a supercritical fluid? [closed]

When making aerogel using supercritical fluids the liquid in the gel is replaced by a gas. Can this be achieved using n-Hexane as the supercritical fluid? What would the resulting gas be? Would it be ...
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Melting point of objects and food

What is the melting point of egg yolk? Well, generally, when we break an egg, the yolk is in liquid state. After we pour it on a pan, the egg starts to cook and it hardens. My question is, can an egg ...
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Why is the temperature graph sigmoidal in simple distillation of components with very different bps?

I'm writing an organic chemistry lab report on distillation and I thought I understood this, but the more I look at my lab textbook, I realize I don't. My textbook 1 explains that the temperature of ...
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What is the temperature needed for a reflux using a mix of solvents as the reaction medium? [closed]

I had a quick query regarding the setup of a reaction. The procedure that I am working from states that I need to put my reaction mixture under reflux for 3 hours. The solvents used are diethyl ether (...
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Why does dimethyl sulfoxide have higher boiling point than acetone?

They have very similar structure except for a central atom, but the difference in boiling points is very large $(\pu{186 ^\circ C}$ for DMSO and $\pu{56 ^\circ C}$ for acetone). How is central atom ...
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Compare the boiling points of isobutane and 1-butyne

Question: Compare between the boiling points of isobutane and 1-butyne The answer to this question is given as 1-butyne has higher boiling point than isobutane. My approach: I have been taught a few ...
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Anomalous boiling point of “iso-” alkanes

I was attempting to compare the boiling points of iso-hexane and 3-methylpentane. Boiling points of organic compounds depend upon three factors according to Master Organic Chemistry – 3 Trends That ...
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275 views

Latent heat of vaporization/evaporation

It's the amount of heat required for liquid ---> gas phase change of a substance at it's Boiling point. But my question is, does providing energy equivalent to latent heat of vaporization to a ...
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Boilling colloidal silver?

I have some colloidal silver that i bought from a shop. It is 18ppm, however, I need a higher PPM and I can't seem to buy it anywhere where I live. If I boil this colloidal silver, would it make the ...
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Why is the boiling point of trichlorofluoromethane lower than that of chloroform?

If $\ce{CFCl3}$ has a higher molar mass, how come $\ce{CHCl3}$ has a higher boiling point? $$ \begin{align} \mathrm{bp}(\ce{CFCl3}) &= \pu{23.77 °C} \\ \mathrm{bp}(\ce{CHCl3}) &= \pu{61.15 °C} ...
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How does the polarizability of an apolar compound influence properties such as its boiling temperature? [closed]

I have understood that the more polar is a compound, the higher is its boiling temperature. But I would like to know what is the justification for this answer. I am new to chemistry so I would ...
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Order of boiling point of group 14 halides

Find out the species having lowest boiling point: (A) $\ce{SnCl4}$ (B) $\ce{GeCl4}$ (C) $\ce{SiCl4}$ (D) $\ce{CCl4}$ I have considered the inert pair effect of $\ce{Sn}$ here which will make the ...
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Vapor Pressure and Boiling Point [duplicate]

I heard that the boiling point of a solution is the temperature where its vapor pressure at that temperature equals the atmospheric pressure at that temperature. Thus at higher altitudes, as the ...
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Doubt about definition of boiling point [duplicate]

The definition of boiling point says boiling point is the temperature at which the vapour pressure of liquid becomes equal to vapour pressure of atmosphere. But how does the vapour pressure of the ...
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Difference in the boiling point of piperidine and cyclohexanamine

The reason that I believe must be the difference in the amount of hydrogen bonding formed by both of the compounds in the liquid . But I suspected that both must be having same amount of hydrogen ...
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Does evaporation occur while boiling as well? [closed]

If evaporation were to occur when a liquid was being boiled, then the amount of liquid changing phase would also depend on the surface area of the liquid exposed to the atmosphere (as evaporation rate ...
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What is the vapor pressure of a liquid if it is not in a sealed container(i.e., a river or lake)? Is it just the atmospheric pressure? [closed]

From what I understand, the boiling point of a liquid is when its surrounding pressure is equal to its vapor pressure. The vapor pressure is the pressure of the gas form of the liquid in a container ...
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Why change on pressure affects the boiling point much more than the freezing point?

I do see the mathematical solution given by the classius clapyeron equation but is there any real life and intuitive expalanation?
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What happens with the boiling point of a liquid in a vacuum [closed]

This may be a silly question, but when I was reading my chemistry textbook, there was this following statement: "A liquid boils when its vapor pressure equals the external pressure acting on the ...
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Why is the boiling point of ethyl fluoride lower than that of hydrogen fluoride?

The book, Solomons' Organic Chemistry (for JEE Mains and Advance), contains the following question: Hydrogen fluoride has a dipole moment of $\pu{1.82 D}$; its boiling point is $\pu{19.34 ^{\circ} ...
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Boiling points of ethylene, formaldehyde and oxygen

The boiling points of ethylene, formaldehyde and dioxygen are $\pu{-103.7 ^\circ C}$, $\pu{-19 ^\circ C}$, and $\pu{−183 ^\circ C}$, respectively. I expect formaldehyde to have the highest boiling ...
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Covalent Bonds and Ionic Bonds [duplicate]

Covalent bond is a strong bond compared to Ionic Bonds but Ionic Compounds have higher melting and boiling points then covalent compounds. Why?
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Why are branched isomers less polarisable?

This fact was given as an explanation as to why branched isomers of a compound have lower boiling points. How are branched isomers less polarisable and how does this relate to London dispersion ...
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Why does hydrazine have a higher boiling point than water?

$\ce{N2H4}$ has a boiling point of 114 °C, which is higher than the boiling point of water. Why is this so? Both $\ce{N2H4}$ and $\ce{H2O}$ have two lone pairs, so the number of hydrogen bonds per ...
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When exactly does the first drop of distillate appear in a distillation?

The below image (source: here) is from a fractional distillation of a mixture of two liquids, one with a boiling point of 69 degrees celsius and the other with a boiling point of 98 degrees celsius. ...
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Which has a lower boiling point, Ozone or CO2? Why?

Ozone is a bent molecule, and therefore, Ozone is a polar molecule. Polar molecules have dipole-dipole intermolecular forces. CO2 is a linear molecule, and therefore, CO2 is a nonpolar molecule. ...
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Can eggs boil indefinitely?

At breakfast someone asked if the eggs were boiling. While obviously they meant the water for the eggs, but it lead to a discussion regarding if you can make an egg boil without it coagulating or even ...
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Elevation in boiling point of water [closed]

$\pu{1060 g}$ of urea aqueous solution is subjected to heating. It starts boiling at $\pu{100.53 °C}.$ It is heated up to $\pu{102.12 °C}.$ Find amount of water vapourised in grams. (Pure water ...
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why does a pot of boiling water quiet down after it reaches boiling point but is still roiling?

I've noticed that when water boils, it makes a lot of noise. After the water reaches boiling point, even though the water is still ""rolling", the water quiets down. What is all the noise about and ...

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