Hydrogen Bonds and Melting Points

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Nathan Mariano 2G
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Joined: Fri Sep 28, 2018 12:29 am

Hydrogen Bonds and Melting Points

Postby Nathan Mariano 2G » Fri Nov 09, 2018 6:48 pm

How do hydrogen bonds affect the boiling and melting point of a substance? What accounts for the difference in the boiling and melting point in H2O and H2S? I was confused about the difference in the boiling and melting point of the H2O and H2S during lecture because they both have the same amount of hydrogens.

Kathryn 1F
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

Re: Hydrogen Bonds and Melting Points

Postby Kathryn 1F » Fri Nov 09, 2018 7:40 pm

The reason H2O has a much higher boiling or melting point than H2S isn't down to the individual atoms, but how they interact with each other.
Hydrogen bonds will generally form between molecules when the H is bonded to an N, O, or F, such as in H2O. They are weaker than covalent bonds but are still a significant interaction.
Therefore, a group of H2O molecules will "hold onto" each other due to the H bonds, requiring more energy to separate one. This is why you need more heat to melt/boil water.


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