Hydrogen Bonds [ENDORSED]

[Samantha Quevedo 2L]

Hello!
I was wondering why is that molecules with hydrogen bonds have higher melting points?

[zackdouchy]

They have higher melting points because it requires more energy to break apart their interactions versus molecules that exhibit london dispersion force interactions.

[Jacob Bright 1C]

Molecules that experience hydrogen bonding tend to have higher melting points than certain other molecules (such as molecules solely exhibiting dispersion forces) because of the fact that hydrogen bonds are relatively stronger than many other intermolecular bonds that a molecule may experience. While it is true that hydrogen bonds are a form of dipole-dipole bonding, they are stronger than a normal dipole-dipole bond. If a molecule containing hydrogen bonds is being converted from liquid to gas phase (boiling), the hydrogen bonds in that molecule must be broken in order for this phase change to occur, and since they are relatively stronger than the bonds experienced by many other molecules, they require significantly more energy to break, meaning they require a higher temperature. Therefore, it holds true that hydrogen bonds will often have a higher boiling point. Hope this helps!

[Nandini_Parmar_1I]

H bonds are one of the strongest bonds, under ion-ion bonds. Therefore, those bonds require much more energy to break. More energy to break = higher melting point.

[Heba Bounar 3K]

Hi! Hydrogen bonding is one of the strongest intermolecular forces. The stronger the intermolecular force, the more energy is needed to counteract those forces. Therefore, molecules with hydrogen bonds have higher melting points because it requires more energy to break their bonds. Hope this helps!

[Harshitha_Pandian_3F]

As we learned in lecture H-bonds have a bond strength of -20 kjmol-1 versus LDFs that are around only -2kjmol-1. If a molecule has multiple H-bonds, it needs much more energy to break those bonds than a molecule that only has LDFs. This means that there needs to be a higher input of energy, or heat in this example to break(melt) the bonds.

[Jelix Tsan 2H]

When a substance goes from liquid to gas state, it requires the intermolecular forces between the molecules to be broken, and that takes energy to do. Increasing temperature is a way to give these molecules enough kinetic energy to break free from these intermolecular forces, however, because hydrogen bonding is the strongest intermolecular force, it means that it takes a higher temperature (more energy) to split up molecules that are held together by hydrogen bonds as opposed to other intermolecular forces. This is why the boiling point of molecules exhibiting hydrogen bonding is greater than those without.

[405479701]

higher melting points= they require more energy to break

[Abby 2B]

hydrogen bonds are the strongest type of intermolecular force, and stronger intermolecular force means a higher melting point. so, if a molecule has hydrogen bonding, it will have a higher melting point than a molecule that does not because it takes more energy to break hydrogen bonds.

[Coraly De Leon]

Hi,
Because hydrogen bonds require more energy to break them apart, they have higher melting points.

[Lindsey Walter 3E]

The stronger the bond, the more energy is required to break the bond. Hydrogen bonds are one of the strongest types of bonds, so a molecule with Hydrogen bonds will have a higher boiling point than many other molecules since those molecules have lower energy/strength bonds.

[Amaris Cagungun 1F]

Hydrogen bonding is one of the stronger intermolecular forces, meaning they require more energy to break thus have higher melting points

[905715668]

Hydrogen bonds increase the boiling point of a substance because hydrogen bonds are strong intermolecular forces

[Clarence Clavite 2K]

Hydrogen bonds are a strong intermolecular force since they take a lot of energy to break. This causes the molecule that they are a part of to have a higher melting/boiling point. Hope this helps!

[Trisha Nagin]

Because they require more energy to break, and therefore have higher melting points.

[Natalie Quilala 1I]

Molecules with hydrogen bonds have higher melting points because they have a stronger intermolecular forces than molecules with dispersion forces or dipole-dipole interactions. Hydrogen bonds occur with a hydrogen atom and two NOF atoms, some of the most electronegative atoms on the periodic table. This creates stronger intermolecular forces that require more energy to break/melt, which is why melting point is higher for molecules with H-bonds.

[elletruchan2I]

Hi Samantha! Melting points are the direct result of the intermolecular forces in a substance, so it makes sense for a higher melting point to be the result of strong intermolecular forces, while a low melting point is the result of weak intermolecular forces. Substances with hydrogen bonds have higher melting points because hydrogen bonds are the strongest kind of intermolecular force, so they'll take the most energy to break.

[Alessandra Marotta 3L]

Hi! Molecules with hydrogen bonds have higher melting points because they are stronger than most bonds, which gives them higher intermolecular forces than london forces and dipole-dipole forces.

[Kimberly_martinez2I]

Hi! Hydrogen bonds have higher boiling points because they are strong intermolecular forces. From strongest to weakest it goes ion-ion, hydrogen bonds, ion-dipole, dipole-dipole, and LDFs. Because H-bonds are strong intermolecular forces they would require more energy to break them therefore having a higher boiling point.

[Sarah Hong 2K]

Hydrogen bonds have higher boiling points because they have strong intermolecular forces that require more energy to break them, making them more difficult to break.

[405479701]

They require more energy to break apart so they have a higher boiling point.

[Ashrita Singh 2F]

Hydrogen bonds are one of the strongest intermolecular forces, so it takes more energy in order to break it apart. As it takes more energy to break apart, it has a higher melting and boiling point.

[Joan Moci 1J]

Hydrogen bonds are very strong intermolecular forces due to the strong attraction between the very electronegative N, O, or F which have a slightly negative charge due and the hydrogen in another molecule bonded to one of those very electronegative atoms and therefore having a slightly positive charge. This attraction between molecules means that a lot of energy is required to separate them, resulting in molecules with hydrogen bonds to have higher melting and boiling points (ie more energy necessary to overcome the intermolecular attraction).

[Rachel Bartley 2B]

Hydrogen bonds are one of the strongest intermolecular forces, meaning they require more energy to break them apart, giving them both a higher boiling and melting point than other intermolecular forces, such as ion-dipole, dipole-dipole, and LDFs.

[Rebekah Jung 1C]

Hydrogen bonds are very strong intermolecular forces, and therefore will require more energy to break.

[Ainsley DeMuth 1H]

Hydrogen bonds are relatively strong intermolecular forces which results in an increased boiling/melting point.

[Madison Kiggins 1E]

Hydrogen bonds have strong intermolecular forces and because of that it requires more energy to break the bond which results in a higher melting and boiling point.

[Cynthia_L_2C]

The reason that hydrogen bonds have higher melting and boiling points is because these bonds have strong intermolecular forces. These bonds require a lot more energy to break.

[Edmond Chu 1C]

Hydrogen bonds are one of the strongest bonds and therefore require more energy to break. Because they require more energy to break, the melting point would be higher.

[Daniel Tabibian 3K]

Molecules with hydrogen bonding take more energy to break apart due to these bonds which results in a higher melting point.

[Kimberly_martinez2I]

Molecules with hydrogen bonding have higher boiling points because they require more energy to break the bond. Hydrogen bonds are strong intermolecular force compared to dipole-dipole and LDF bonds.

[Hayden Jackson]

Hydrogen bonds are one of the strongest intermolecular forces, and since melting involves loosening the intermolecular attractions between molecules, the stronger the force, the more energy required to loosen it enough to convert the molecule into a liquid. The same is true for the boiling point of substances with hydrogen bonding, they are higher than substances that experience only dipole-dipole interactions or london dispersion forces. Hope this helps!

[Anisa Subbiah 14B 1L]

Hydrogen bonding is one of the stronger intermolecular forces. This means they require more energy to break. Therefore molecules that can undergo hydrogen bonding have higher melting points

[Jaipal Virdi 2I]

In the context of dipole-dipole interactions, a hydrogen bond will have the highest boiling points as its bonds are the strongest. Hence it requiring more energy to break. I hope this helps :)

[305749341]

Molecules with hydrogen bonds have higher melting points because their intermolecular bonds are stronger and harder to break when making phase changes. This is due the fact that the change in electronegativity between a hydrogen atom and a F-O-N atom is very high.

[Hailey Sarmiento 3E]

Molecules with hydrogen bonds have higher melting points because this intermolecular force keeps the molecules together stronger than say dispersion forces. As a result, more energy is necessary to break the molecules apart and cause them to melt.

[Jordyn Lee 1J]

Hi, hydrogen bonds have higher melting points because they are stronger intermolecular forces compared to other forces such as induced dipole-induced dipole forces. This means that it takes more energy to break the hydrogen bonds, resulting in a higher melting point.

[Jelix Tsan 2H]

Molecules with hydrogen bonds have higher melting points because they exhibit greater intermolecular forces, so these molecules are harder to separate when they are packed together in their solid state. As such, these molecules require higher temperatures in order to have enough kinetic energy to separate and enter a liquid state.

[Edriana J Altea 2G]

Hydrogen bonds have higher melting points because it does require more energy to break them due to the high energy levels naturally within them.