Intermolecular Forces and Boiling Points

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  • Опубліковано 4 лис 2015
  • Why do different liquids boil at different temperatures? It has to do with how strongly the molecules interact with each other through intermolecular forces. Find out all the different ways, and how to use them to make predictions about matter!
    Watch the whole General Chemistry playlist: bit.ly/ProfDaveGenChem
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КОМЕНТАРІ • 1,1 тис.

  • @ProfessorDaveExplains
    @ProfessorDaveExplains  5 років тому +1535

    Guys, listen! In this video, I state that Van der Waals forces and London Dispersion forces are interchangeable, that's actually incorrect! Dispersion forces are momentary dipole-induced dipole interactions, the weakest, whereas Van der Waals interactions are an umbrella term that includes dispersion forces as well as any other interactions involving dipoles, just not interactions involving formal charges. Sorry, my fault!

    • @biologistsnotebook6892
      @biologistsnotebook6892 5 років тому +105

      Yeah! I was a bit confused when you say that.. But , thanks you've recognized your mistake. No one is perfect, though. In general , your videos are the best.

    • @afnansaqib8345
      @afnansaqib8345 5 років тому +18

      No matter.All is well.I was just confused.Thankyou for recognizing ur mistake.
      As(to err is man).

    • @maxomax9039
      @maxomax9039 5 років тому +12

      u are my role model

    • @MrFrezeeTr
      @MrFrezeeTr 5 років тому +8

      Also can I ask does ion-ion isnt intramolecular interaction? I mean ionic bond and ion-ion isnt the same thing?

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  5 років тому +74

      when discussing ion-ion interactions, we are referring to the interactions within a lattice of many repeating formula units, so we would call this intermolecular, as there are not really any molecules to speak of.

  • @jackquinn9933
    @jackquinn9933 3 роки тому +4385

    POV: You have an exam today

  • @ArkTheGreat
    @ArkTheGreat 7 років тому +4500

    Thank you chemistry jesus.

  • @brandonfontenot3406
    @brandonfontenot3406 8 років тому +903

    Professor Dave, I do believe you just saved all of my AP Chemistry students.

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  8 років тому +217

      +Brandon Fontenot happy to be of service! if you could ask them all to subscribe that's all the thanks i need!

    • @ethanjordan6914
      @ethanjordan6914 8 років тому +530

      +Brandon Fontenot if thats the case brandon then you need to quit your fucking job

    • @donnywalker6068
      @donnywalker6068 7 років тому +20

      lmao

    • @pankajtopre148
      @pankajtopre148 6 років тому +17

      amen .

    • @maxmocs5008
      @maxmocs5008 4 роки тому +19

      @@ethanjordan6914 I like how this reply has the exact same number of likes as the original comment

  • @euscieu4246
    @euscieu4246 7 років тому +767

    I wish I found you when I was in high school. I'm a medical student now reviewing my chemistry to strengthen my knowledge of biochemistry and man are you great at teaching!
    Some concepts were not that clear before, yet you explain them so clearly.
    I've had so many eureka moments 😂
    Thank you so very much!

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  7 років тому +120

      woohoo! happy to help!

    • @aryasinghthakur2554
      @aryasinghthakur2554 5 років тому +10

      i feel ya (eureka moments) 😂😁

    • @Ferb747
      @Ferb747 5 років тому +4

      EuSciEu How did you revise for your A Levels?

    • @Anonymous-zh2xn
      @Anonymous-zh2xn 2 роки тому

      @@ProfessorDaveExplains hi professor Dave please what is the meaning of the arrow with a plus sign on it

    • @sonicx254shere3
      @sonicx254shere3 Рік тому +1

      @@Anonymous-zh2xn oh thats the dipole, a sorta interaction(or force) that develops when one of the participating atoms attracts the electrons to itself more than the other atoms
      This happens when its electronegativity(how much an atom attracts electrons) exceeds the other atoms by a significant amount, thus causing a sort of net force to develop due to the uneven attraction
      Where, and why(more importantly why not) it occurs in certain molecules over others is already covered in the vid, but i hoped i heloed!(and was right in all that i said)

  • @aadithyahrudhay2269
    @aadithyahrudhay2269 5 років тому +398

    Hi Professor Dave.
    As a ninth grader, it's very hard for me to find what happens at a molecular levels- be it for such chemical bonding or even physical phenomena such as refraction. This is because frankly people don't care and make the effort to understand; or because some explanations are too complex and beyond my level. Hence, I'd like to sincerely thank you for uploading these helpful videos. Without all the glam and hype, you explain concepts in such an easy to understand manner. In fact, I'm really surprised that not many people know you. Whenever I search for a concept in UA-cam, I make sure to specify your channel! Thanks once again!
    A.H.A

    • @abdulghafoor6610
      @abdulghafoor6610 4 роки тому +4

      Mee tooo

    • @aadithyahrudhay2269
      @aadithyahrudhay2269 3 роки тому +5

      @@joshpatra Thanks Josh, will do! I already do that for a few topics so...

    • @aadithyahrudhay2269
      @aadithyahrudhay2269 3 роки тому +6

      @@Metal_Master_YT Oh lmao that's nice... I'm in twelfth right now, this was some time ago :)

    • @aadithyahrudhay2269
      @aadithyahrudhay2269 3 роки тому +3

      @@Metal_Master_YT Thank you. Same to you, and all the best :)

    • @excelery3125
      @excelery3125 Рік тому +8

      its been 3 years how are you doing now

  • @khoale7554
    @khoale7554 2 роки тому +41

    I swear just ten minutes listening to you is just somehow much more helpful than two 45-lmin lectures combined, just to demonstrate a SINGLE POINT. Thanks a lot, professor!

    • @olive_1a
      @olive_1a 7 місяців тому +1

      no seriously.....my chem teacher just uses materials from another teacher...and just wanna say thank you for making these videos :") so straight to the point yet understandable! i have a quiz tomorrow, and this is really helping currently. hope you know you saved so many students' grades making educational videos like this

  • @zulanova1209
    @zulanova1209 Рік тому +87

    Chapters:
    0:34 Ion-Ion
    0:48 Ion-dipole
    1:56 Dipole Dipole
    3:06 Van der Waals / Londen Dispersion (LDF)

  • @orderingfoodwgoogledoxesu3113
    @orderingfoodwgoogledoxesu3113 5 років тому +53

    Most underrated Channel on youtube!
    Thank you Dave, you got me through college (I am a verbal and visual learner), I am doing analytical chemistry now, working on HPLC-MS analysis of oil samples in the Arctic environment.

  • @d76doc
    @d76doc 7 років тому +186

    i didn't know russel brand new chemistry

  • @stevensteven6091
    @stevensteven6091 8 місяців тому +8

    Bro Mr. Professor here is saving so many generations. I see past comments of him saving students, he just saved me. Who reading in the future has perhaps just gotten saved even if it's not this specific video. We appreciate you so much

  • @kaumadinagahawatte9237
    @kaumadinagahawatte9237 Рік тому +19

    Hai Prof Dave, Im a teacher/ lecturer in chemistry and currently doing my chemistry education masters as well. Thank you so much or your videos. We use ur videos to understand concepts much easier also it helps me in teaching school level students too. Mainly because u touch the fundamentals which even most of the chemistry teachers does not explains. So thank you for helping me to improve my knowledge in chem as well as to be a good teacher in chem. God bless you....

  • @69bitboy
    @69bitboy 7 років тому +10

    I have checked out different IMF's videos, and yours is the best! It was extremely coherent in the way you connected everything. Plus the review at the end was super helpful. Thanks, Professor!

  • @greywolfxx1
    @greywolfxx1 7 років тому +786

    chemistry is FON! way to remember hydrogen bonds

    • @raghavgarg1747
      @raghavgarg1747 6 років тому +4

      it does. example : chloral hydrate is one of the only vicinal diols that exist. that is due to chellation only

    • @venkatachalamviswanathan3950
      @venkatachalamviswanathan3950 6 років тому +3

      mmm ppp it's charge to volume ratio isn't as high as fluorine, oxygen or nitrogen so the charge is spread out and effectively diluted

    • @rabijamali6321
      @rabijamali6321 5 років тому

      Lindsay G. Please don't.

    • @Adriel_HD
      @Adriel_HD 5 років тому

      ohh yeaa

    • @nickb9731
      @nickb9731 4 роки тому +17

      Or F NO.

  • @nyluong5427
    @nyluong5427 4 роки тому +11

    I love listening to your videos while driving. I spend 2 hours commuting between home and school everyday, so studying while driving is a good way to save time. Your lessons are so detail and clear that I can understand without looking at the videos. (Unlike Crash Course, too fast and overwhelming) Thank you!

  • @marcorojas7875
    @marcorojas7875 7 років тому +34

    Professor I have my AP Chemistry Semester Final in a few weeks and I am going to be binge watching your videos. You're awesome. :D

    • @big_e_3
      @big_e_3 4 роки тому +3

      How'd it go?

  • @kentezekielomega
    @kentezekielomega 3 роки тому +133

    POV: You watched this many times but you still don't understand it

    • @bullseye3054
      @bullseye3054 3 роки тому +1

      😂😂

    • @xtraxearthling
      @xtraxearthling 3 роки тому +4

      Maybe start slow and touch up on key terms first like dipoles and covalent bonds, etc. SOOO much fancy science vocab! but you can do it!! :D

    • @Drforeverok
      @Drforeverok 7 місяців тому

      lmaoo this shit pisses me off watching this guy

  • @ukkomies100
    @ukkomies100 7 років тому +89

    Your intro is the meaning of life😆

  • @sahithikadari187
    @sahithikadari187 Рік тому +15

    I honestly respect you for making the videos while you may or may not also be teaching classes-

  • @JakeOgle1994
    @JakeOgle1994 8 років тому +16

    My text book makes these simple concepts so complicated. Thank you for the simplification! New Subscription!

  • @prodigygaming802
    @prodigygaming802 5 років тому +20

    0:04 best intro ever.

  • @fariborzshokoofh2090
    @fariborzshokoofh2090 6 років тому +5

    This is the most articulate professor I have ever experienced. Great

  • @andreahenry838
    @andreahenry838 7 років тому +13

    Thank you Prof. Dave. I am learning Chemistry for the first time.

  • @connorwallis8884
    @connorwallis8884 7 років тому +4

    Really cool to see someone help others like this on their own👍

  • @RedSoxfan95
    @RedSoxfan95 7 років тому +43

    thank you so much for explaining the concept, better than my textbook

  • @StudyWithM3E46
    @StudyWithM3E46 6 років тому +2

    subscribed because of how clearly you explain concepts and the fact that you comment on here! Great way to show youre active and you read comments and open to feedback.
    thank you!

  • @rittenbrake1613
    @rittenbrake1613 6 років тому +1

    This guy can explain things crazily clear , appreciate very much

  • @josephcourtade9833
    @josephcourtade9833 4 роки тому +55

    Thank you Professor Dave, my chem teacher is not the best and you are doing a wonderful job filling in for her failing. I would be failing without you.

  • @beaubarrett1355
    @beaubarrett1355 4 роки тому +3

    i appreciate these videos so much! You're helping me survive CE Chem!! thank you a thousand times!

  • @caloz.3656
    @caloz.3656 3 роки тому +1

    these videos are so perfectly well explained it's carrying me through ap chemistry. thanks a lot!

  • @lucapetrescu6990
    @lucapetrescu6990 6 років тому +7

    Chem test tmw... thank you chemistry jesus. You have once again explained this better than my teacher

  • @avreeuey2567
    @avreeuey2567 3 роки тому +95

    trying to cram random info for my chem test and uhhhh i think I'm about to fail this like what is this man sayingggg

    • @siesie7074
      @siesie7074 3 роки тому +11

      same haha i missed like three days of school and in covid times that's like nine days of lessons so praying I don't flunk my bonding test soon.

    • @ropey1663
      @ropey1663 Рік тому

      How did you guys do?

  • @julianmiguel6496
    @julianmiguel6496 7 років тому +4

    Bless your heart for saving my life in chemistry! Thank you!

  • @KathleenLouisseQAchas
    @KathleenLouisseQAchas Рік тому +1

    You just made me understood these concepts better than my in-person class. Thank you for uploading this!

  • @paupausings1269
    @paupausings1269 Рік тому +1

    This helped me review for my Chemistry 11 finals and I actually had so much confusion with this topic. Watching this video made everything clear. Thanks so much, Professor Dave!

  • @anvi8189
    @anvi8189 2 роки тому +7

    As always great work Dave, thank you so much

  • @kripashankarshukla4073
    @kripashankarshukla4073 6 років тому +6

    Your videos made me a chemistry genius. Thanks you so much and I can't express how helpful your videos are for me

  • @lakep7798
    @lakep7798 Рік тому +1

    This was FANTASTIC! Super clear. Thanks, Professor Dave!

  • @newmoonprincess
    @newmoonprincess 5 років тому

    THANKS SO MUCH and the little quiz at the end was tremendous help!

  • @kattirivinius5625
    @kattirivinius5625 5 років тому +5

    You have been so helpful! I have a college Chemistry exam today and I am struggling with this particular aspect. It is much more clear now. Thank you

    • @jlyn7468
      @jlyn7468 4 роки тому +1

      This is our 9th grade chemistry lesson : P

    • @ewyes5935
      @ewyes5935 2 роки тому

      @@jlyn7468 believe it or not but people study the same thing in college but more in depth

  • @yeeyeehaaw
    @yeeyeehaaw 6 років тому +8

    Totally acing my chemistry mid-term test a few weeks ago, thanks to your videos sir! Now on my way to my final term test and watching your videos to strengthen my comprehension. Wish me luck :)

  • @maximgorgan9416
    @maximgorgan9416 2 роки тому

    Thank you, professor Dave! The visuals really help grasp the topic!

  • @Supernyv
    @Supernyv 5 років тому +1

    Nicely and smartly summarized, thank you so much!

  • @patientno1797
    @patientno1797 7 років тому +102

    i'm here for his intro tbh

    • @subomiyusuf7894
      @subomiyusuf7894 4 роки тому +2

      i disliked just so you can see the like count

  • @amanrubey
    @amanrubey 7 років тому +3

    love you !!
    I loved the last part (comprehension) green and black colour just won my heart

  • @alexandrmxox
    @alexandrmxox 2 роки тому

    Seriously thank you so much for these videos, I have been basically teaching myself Chem and I have learned more from your videos in one day then the entire month and a half I have been in school! Thank you!

  • @orfeassiozos1575
    @orfeassiozos1575 3 роки тому +1

    Thank you so much professor Dave! Understood everything much better after your video!

  • @MegaCodeman420
    @MegaCodeman420 6 років тому +3

    These videos are great. Thank you so much chem 112 is kicking my butt especially molecular orbital Diagrams

  • @yeongkx2005
    @yeongkx2005 5 років тому +3

    You're so much better than my school lecturers!! Subscribed :))

  • @Nazra_Chemist
    @Nazra_Chemist Рік тому +2

    Being a university teacher and researcher, these basic concepts helps me alot ..... Thanks Dave

  • @annelr.9466
    @annelr.9466 4 роки тому

    Thank you for the video. This was truly helpful for the course that I am currently taking. My teacher explained it one way but it is always good to learn from other perspectives. Much appreciated.

  • @call.me_dadx4516
    @call.me_dadx4516 Рік тому +5

    POV: you missed one lesson and now you’re a term behind

  • @siesie7074
    @siesie7074 3 роки тому +3

    This was so much more helpful than my chem teacher explaining it. Am in grade eleven doing so many lessons a day with covid so this really helped!

  • @eduardogaldino3670
    @eduardogaldino3670 5 років тому +3

    You know a lot, and superb explanations,thank you Mr Dave!

  • @dominicestebanrice7460
    @dominicestebanrice7460 Рік тому +2

    You make EVERY SENTENCE COUNT and the prep. work that takes is much appreciated. It reminds me of a quip by that great orator Winston Churchill; he apologized to the members of House of Commons for making them sit through a long speech because he "didn't have time to write a short one".

  • @jennlarsen6119
    @jennlarsen6119 2 роки тому

    Love your video, I am working on a project on boiling point for geochemistry and you helped put the pieces together. Thank you so much

  • @mariasantamaria2364
    @mariasantamaria2364 7 років тому +247

    YOU ARE A CHEMISTRY JESUS

    • @Syiepherze
      @Syiepherze 6 років тому +3

      Maria Santa Maria holy crap you're right

    • @ss-gc1ri
      @ss-gc1ri 5 років тому +1

      HAHAHAHAHAHAHAHA

    • @aniawo5119
      @aniawo5119 5 років тому +1

      😂 yep. Mine too

    • @sophieandreaz984
      @sophieandreaz984 3 роки тому +1

      becareful with what you say!

  • @ismailnurudeen
    @ismailnurudeen 3 роки тому +3

    My Professor recommended this video in his material on Thermochemistry.
    You should know what that means 👏🏾

  • @lucydavis7549
    @lucydavis7549 5 років тому +2

    You just saved my life. Thank you, sir.

  • @ComandaKronikk
    @ComandaKronikk 7 років тому +2

    wow man so helpful! this is exactly what i was unsure about, i am now a bit more confident the big chem test on monday will go smoothly!

  • @suzettebalboa4701
    @suzettebalboa4701 7 років тому +15

    Mabuhay from Philippines. Thank you so much..

  • @samost7352
    @samost7352 5 років тому +3

    My God, I love your videos, thank you for explaining so well, what my professor can't.

  • @reandranisbet1361
    @reandranisbet1361 7 років тому +2

    I went an enter term not understanding this work,but in 10 minutes I finally understand it!THANK you!

  • @jean7326
    @jean7326 4 роки тому +1

    THANK YOU SO MUCH THIS IS EXACTLY WHAT I NEEDED

  • @madnad4284
    @madnad4284 6 років тому +3

    Thank you so much, you helped me a lot! :)

  • @kripashankarshukla4073
    @kripashankarshukla4073 6 років тому +6

    You deserve more than 1 million subscribers

  • @atheermmadlool2862
    @atheermmadlool2862 4 роки тому

    I do appresiate your method in illustrating information. I am really grateful for you prof. Dave

  • @muhdsyahir9416
    @muhdsyahir9416 5 років тому +2

    Helps a lot. Thanks for the video. And also thanks for the knowledge.

  • @reko6262
    @reko6262 8 років тому +10

    very rich information thanks alot

  • @haileymoehlmann9198
    @haileymoehlmann9198 4 роки тому +8

    you just saved my engineering chem grade. God bless.

  • @kripashankarshukla4073
    @kripashankarshukla4073 6 років тому +1

    Merry Christmas sir! I hope you are celebrating Christmas well!

  • @felixsahlen1836
    @felixsahlen1836 Рік тому

    Just really good and informative. I'm impressed!

  • @iBOSSHOG
    @iBOSSHOG 7 років тому +4

    Bro, I started dying when you said that Van der Waals was the consolation prize of the inter-molecular forces. Also, thank you for the vids, saving my grades.

  • @bhaskarp20
    @bhaskarp20 3 роки тому +17

    POV: you’re in chem class

  • @mehdisaffar
    @mehdisaffar 6 років тому +1

    Very clear and helpful explanation. Thank you very much

  • @geethikaranasinghe9712
    @geethikaranasinghe9712 4 роки тому

    Professor Dave I'm so glad that you have such a clear accent. I really didn't wanted to use captions.

  • @rademaxwell3436
    @rademaxwell3436 5 років тому +16

    Whenever me and my friends are struggling with chem in class we are like Jesus will help us at home
    Thanks

  • @ninaaq5688
    @ninaaq5688 3 роки тому +4

    Watching this before my a level test tomorrow 😭😭😭

  • @djchemtalk2946
    @djchemtalk2946 6 років тому +2

    Crisp and apt explanation..... thx prof.

  • @asbinapaudel2442
    @asbinapaudel2442 6 років тому +2

    You are great ....so great teacher that I had ever found!!

  • @privateconfessions7821
    @privateconfessions7821 7 років тому +27

    I love how you comment on other peoples videos, I found your channel that way.
    I think it was a comment on a Khan Academy video

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  7 років тому +17

      i just can't keep my opinions to myself!

    • @privateconfessions7821
      @privateconfessions7821 7 років тому +1

      Great way to allow students to find your channel

    • @privateconfessions7821
      @privateconfessions7821 7 років тому +1

      My textbook say electrical conductivity is ability to conduct electric current due to free electrons with changing composition of the substance.
      Is this correct the with changing substance part, I hope it's not spelling mistake and actually without 😰

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  7 років тому +5

      oh, no i would say it's without, metals conduct electricity because electrons are able to flow freely through the network of covalent bonds, so the substance doesn't change its composition, unless one counts the flow of electrons as changing composition. i would think that its without!

    • @privateconfessions7821
      @privateconfessions7821 7 років тому

      I knew it thanks bro, dedicated fan now 💪💪💪

  • @Sangamdeepsingh23
    @Sangamdeepsingh23 5 років тому +4

    Sir thsnks for teaching this topic i wad finding a great video which i think i have found 🙃🙃😌😌

  • @sophiafang2845
    @sophiafang2845 4 роки тому +1

    Your video is so helpful. Thank you.

  • @emmanuelelikplimgodzo2273
    @emmanuelelikplimgodzo2273 5 років тому +1

    It's nice to have you.

  • @gabrielmalbarosa3650
    @gabrielmalbarosa3650 6 років тому +3

    SO hard for me to understand intermolecular forces. This helped a lot!!

  • @stephenjmatthews
    @stephenjmatthews 8 років тому +3

    Professor Dave, I have been loving your videos; thank you. I am a physics teacher and have picked up IB High Level Chemistry so I am having to brush up on a lot of concepts. I have a question about van der Vaals forces. Your video classifies only the London Dispersion forces as van der Waals forces, however, according to my textbook and goldbook.iupac.org/V06597.html, van der Waals also includes permanent dipole-dipole and dipole induced dipole interactions. Is this a common discrepancy of classification?

    • @ProfessorDaveExplains
      @ProfessorDaveExplains  8 років тому +1

      it's true, i have seen van der waals mentioned as including dipole-dipole interactions of all varieties, whether momentary/induced or permanent, this is not what i was initially taught, but to be safest it may be easy to refer to them as dipole-dipole interactions when the dipole is permanent and dispersion forces when temporary, just to be most specific. sorry for the confusion!

    • @stephenjmatthews
      @stephenjmatthews 8 років тому +2

      Thanks, keep up the great videos

  • @pjs1164
    @pjs1164 5 років тому +1

    Great video man this helped me so much for preparing for my quiz tomorrow thank u👍👍

  • @abdulazizmemesh2791
    @abdulazizmemesh2791 5 років тому +1

    Keep on going, I like your videos and I like your selection of words. Every time I see your videos, I learn the content on top of new vocab words

  • @sabymohammed6198
    @sabymohammed6198 7 років тому +13

    better than my textbook

  • @souravmahanty7025
    @souravmahanty7025 4 роки тому +7

    That moment when the AP Chem quiz is tomorrow but you haven't done a single page of homework, so you find yourself here at 2 AM struggling to find the will to survive.

  • @alias40anon
    @alias40anon 5 років тому

    Very good video, short with enmphasis on the essential theoretical points and explanatory with nice and simple example

  • @wunks7
    @wunks7 7 років тому +1

    Thanks for this. It helped me a lot.

  • @kabiiteswabrah1281
    @kabiiteswabrah1281 Рік тому +3

    POV : your in the bus on the way to your exam

  • @user-bz6sq8gf8y
    @user-bz6sq8gf8y 6 років тому +3

    i love how everyone is calling him chemistry jesus haha

  • @PostMortemix
    @PostMortemix 3 місяці тому

    Thank you for this wonderful video!

  • @tharushiinduwara7169
    @tharushiinduwara7169 6 років тому

    thank you for explaining about london dispersion forces so clearly , now i am relieved

  • @0u0u0u0u0u0u0
    @0u0u0u0u0u0u0 4 роки тому +3

    south park canadian

  • @caroljackson767
    @caroljackson767 4 роки тому +1

    Thank you Professor Dave! Amazing!

  • @imme9927
    @imme9927 2 роки тому

    I love clear explanation from Prof Dave

  • @simakekana9965
    @simakekana9965 8 років тому +2

    might just ace my test tomorrow. thanks all the way from south Africa