Identifying Intermolecular Forces - Real Chemistry

In this video you will learn how to determine what intermolecular forces act between different molecules. We will introduce 1) Dispersion forces - forces all molecules possess due to temporary dipoles 2) Dipole forces - forces molecules posses if polar and 3) Hydrogen bonding - A sort of super dipole that results from hydrogen being bonded directly to N, O or F. We will then compare the strengths of these intermolecular forces and discuss how they relate to boiling point.
To understand how we know when a molecule is polar, please watch this video: • How to tell if a molec...

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i love that you went through problems! most people just explain the forces but don’t show us how to apply that to actual problems so this really helped! you teach better than my prof!

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I now know how to determine inter-molecular forces. Great video, very cool!

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This helped me to know the differences in all 3! Thank you! 😊

[@RealChemistryVideos]

Glad it was helpful!

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If in the last exercise we had ionic compounds those would have the greatest BP, rigth?

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Awesome video. You do sound like Seth Rogen though. (That is a compliment)

[@Badgerbahalwan]

thank you for the great video. quick ? tho.. for the first problem in the practice problems, i came to the conclusion that there should be H-bonding. My reasoning is that since its intermolecular forces (between molecules) there would be another molecule with a partially negative N and it would want to bond with the H (partial positive) and that would then be a H-bond. is this correct?

[@RealChemistryVideos]

Hey Amir,
You are 100% correct that the nitrogen will be a little negative and hydrogens ever so slightly positive. To have hydrogen bonds, you need to the larger partial charges that come when a hydrogen is covalently bonding to O, N or F. Then you get a relatively large partial negative/positive and the strongest IMF - hydrogen bonding.
Basically, since H isn't bonded to N through a covalent bond, there is no hydrogen bonding in this molecular.

[@mrobireonomewilliams2998]

Please what software did you use in making this video?

[@RealChemistryVideos]

I make a presentation on powerpoint and use a template that has a blue square in the top right (where a video of me teaching is eventually placed). Then I use an ipad with Doceri to scroll through and annotate the slides. Doceri also lets you capture all of this annotations and audio. While I annotate my slides I am also recording a video on a camera and (when I am not lazy) a separate audio file from a nicer microphone. I put all of these video/audio sources together with sony movie maker.
Happy to share more if you have more questions.

[@charlespiety5229]

great video but that is not steam above the water. It is condensed water vapor.

[@aliciananatabi5003]

If hydrogen bonding occurs in only F,O and N then what about C2H5OH(ethanol)

[@RealChemistryVideos]

Ethanol has hydrogen bonding since the OH at the end represents an H directly bonded to an O.

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[@meganebeaupre5140]

What is ion-dipole force?

[@RealChemistryVideos]

Hi Megane,
The ion-dipole force occurs in mixtures of ionic compounds and polar compounds. This force is stronger than any discussed in the video. Good question!

[@ltshugoki583]

For hydrogen bonding does a N,F, or C have to be bonded directly to the hydrogen atom

[@RealChemistryVideos]

Correct. So a molecule with a structure of O=C-H would not have hydrogen bonds, where C-O-H would.

[@ltshugoki583]

@@RealChemistryVideos ok thanks

[@devnarula2003]

isnt ion-ion stronger than hydrogen bonding 4:00

[@mariagarcia-estreyer2493]

I'm pretty sure

[@jolk4459]

Wdym? All of these are ion to ion bonds, intermolecular forces are just three categories created to group said forces by relative strength.
I might just be misinterpreting what you’re trying to say though.
Or I could be wrong.
Probably the ladder lmao.

[@RealChemistryVideos]

by ion-ion forces, do you mean the forces present in an ionic bond between say a cation and anion? These are certainly stronger but are considered intrAmolecular forces. Because they are within a single ionic molecule.
There is a force stronger than any of what we discussed here that occurs in mixtures, those forces are called ion-dipole forces. This occurs whenever there is a mixture of ionic compounds and a polar compound ( like salt water).
I hope that helps!

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Great video!