11.1 Intermolecular Forces | General Chemistry
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- Опубликовано: 5 июл 2024
- Chad provides a comprehensive lesson on Intermolecular Forces and how they affect the bulk properties of liquids and solids. The lesson includes definitions and descriptions of Hydrogen Bonding, Dipole-Dipole Forces, London Dispersion Forces, and Ion-Dipole Forces. The lesson also expounds on how greater intermolecular forces lead to higher boiling points, higher melting points, higher enthalpy of vaporization and enthalpy of fusion, greater viscosity, greater surface tension, higher critical temperature and pressure, and lower vapor pressure. Finally, four examples of ranking intermolecular forces are worked out for the student.
I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at www.chadsprep.com/chads-gener...
If you want all my study guides, quizzes, final exam reviews, and practice exams, check out my General Chemistry Master Course (free trial available) at www.chadsprep.com/genchem-you...
00:00 Lesson Introduction
00:51 What are Intermolecular Forces?
03:00 Dipole-Dipole Forces
05:35 Hydrogen Bonding
10:33 London Dispersion Forces
14:10 Ion-Dipole Forces
17:13 Intermolecular Forces and Properties of Liquids
23:07 Vapor Pressure and Boiling Point
26:14 Ranking Intermolecular Forces Example #1
27:54 Ranking Intermolecular Forces Example #2
30:12 Ranking Intermolecular Forces Example #3
31:28 Ranking Intermolecular Forces Example #4
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Thank you very much, I just clicked on all the other intermolecular forces videos on RUclips and feel so tired and bored. Then I found your video, very helpful and easy to understand! Thank you one more time legend :D
Very kind words - thank you.
Started using Chad's Prep in the Spring but skipped summer semester. Now that I'm back for Fall semester, it's good to see my ole pal Mr. Chad and his awesome t-shirts
Glad to hear it, Andre - welcome back and Happy Studying!
@jamespalmer2579 Sounds like you have the foundation for an intriguing sci-fi story.
Thank you so much Professor Chad. God bless your soul. You are saving many students out there, including me in Chemistry.
You're welcome and Thank you!
This video made me understand IMF more than my textbook and every other youtube video I've watched - thank you so much for proudcing this!
You're very welcome!
Great stuff. Thanks.
Editing in 'area' totally caught my attention (great idea) and then...
I loved when it said 'area' on your head.
It's the small things in life.
Thanks for saying so and Happy Studying!
Damn, brother. I have a small presentation due in 3 days and with your help, I will for sure be getting an A! Your explanations are very concise and clear to understand. Please do not ever stop lending a helping hand. Phase diagrams, here I come!!
Glad you found us - Happy Studying!
thank you
Very easy to understand and your presentation is awesome, Looking to more lessons.
You're welcome and Happy Studying!
I love Chad's Prep!
Excellent!
Sir can l never hear before that electrons which are in continuous motion in an atom stopped suddenly . Sir is it possible that the electrons got freeze in one side of atom???
can you please give the time in the video for your question
Finals in 45 min
Best wishes! Hope you kill it!
Can you break down how you found the molecular weight
Is this about a particular time in the video? We find the molecular weight by adding together the molecular weight of each atom in the molecule from the periodic table
Sir you are awesome aaaaa l can't define your teaching method , the best method 😊😊😊😊
Thank you very much!
you are the best! thank you
You're welcome and Thank You!
youre a legend!
Thanks!
You really did justice to this Gracia
Thank you.
Sir why you are saying that the things which we cook at the top of mountain takes a greater time to cook as at the top the atm is also lower and so we also need low temperature to cook it so why it should takes a long time to be cook proper???
Yes the water you are cooking food in will reach boiling point at a lower temperature, but, it is not the process of boiling the water that cooks the food but the process of transferring energy into the food molecules... so once the water boils it cannot get any hotter or else it evaporates, therefore the lower temperature means it takes longer to transfer sufficient energy to the food molecules to cook them
Mean that the sea level atm will be our standard atm and the vapour pressure of the things at sea level will also be standard so if we cook or boil food or water anywhere except sea level then we have to cook or boil it for longer time ?????
slightly, yes
According to the vapor pressure/ boiling temp graph, as vapor pressure goes up, boiling point goes up. I am confused how the molecules with stronger IMF have a higher boiling point but a lower Vapor pressure according to this graph? Time in video is around 26:30 onward
Sorry Nick, I can see the source of your confusion. The graph shows a plot of vapor pressure vs temperature for a single substance. I provided it simply to give a more thorough definition of boiling point as the boiling point of a substance is the temperature at which its vapor pressure is equal to the atmospheric temperature. But note that it is just temperature that is plotted on the x-axis, not the boiling temperature. While we can deduce the boiling temperature from the graph, the x-axis is just temperature. The key though is that this graph just shows a single substance. If I were to plot the vapor pressure curves of multiple substances on the same plot, what you would see is that substances with lower IMFs would be left-shifted on the graph, and substances with higher IMFs would be right-shifted. There is a great plot demonstrating precisely this about half way down the page at the following link:wisc.pb.unizin.org/minimisgenchem/chapter/vapor-pressure-m10q3/
It plots the vapor pressure curves for 4 different substances. The one with the highest IMFs (ethylene glycol) has its curve furthest right from which you would determine it has the highest boiling point of the 4 substances.
Hope this helps!
@@chadmcallister3409 This is so perfect thank you so much for all that you do!!!
bro is the goat
Thanks
Sir the thing which I am talking about is LDFs ( London Dispersion forces) sir you have released this video 2 yers ago in 2021/2022 it is about IMFs
Hi there, if possible can you make your questions as clear and coherent as possible as I am struggling to understand what you are asking in several cases 🙏
@@ChadsPrep sir you said that in case of LDFs electrons in an atom get freeze / stopped suddenly at one side due to which a dipole is induced in a nearby atom facing it . Sir it possible that electrons stopped moving suddenly?
It is a temporary dipole - when I said "freeze" I did not mean that the electrons stop moving completely, more that they hover around that spot. The only way to 'stop' a paticle is to remove all of its energy.
As a matter of fact, I do like them crunchy😂
Indeed!
Give me what out of the oven or freezer!?!?!?!
You will never forget it!