9.2 Polarity | General Chemistry

[@charlesharn4460]

Loved the review on polarity. Just one thing I would like to point out, when you were talking about the polarity of water, you actually drew the dipole lines toward the hydrogens instead of toward oxygen. Best regards.

[@ChadsPrep]

Well that's embarrassing! But thanks for taking the time to point it out. I'll be sure to pin this comment for possible future puzzled students to see!

[@FrontierThesisYU]

The general rule you give at 20:02 is SO HELPFUL and good to know! Makes everything much more simple. Thank you.

[@ChadsPrep]

You're most welcome.

[@dbutt2827]

You're fantastic man ! Got my chemistry final exam for my general engineering year in 2 hours! Thanks!

[@ChadsPrep]

You're welcome - Best on your final!

[@roundbottomflask7655]

Sir , your videos are very helpful , if teachers in schools also start teaching like this , the world would change .

[@ChadsPrep]

Thank you

[@akki3924]

17:12 sir I think in case of water you draw dipole moment vectors in wrong direction. Thanks for these amazing lectures though

[@ahmadou7Qasim]

Hi Chad, I want to express my empathy for what is happening in your country, specifically LA, my prayers and thought are with you all. I have a curious Q, what is the meaning of v-sign you always do when explaining? You can check this video @ 3:02 exactly. I am curious because I copied it and I suddenly saw one person doing it. I am happy I know you, I always enjoy your lesson more than my lecturers. Thank You!

[@ChadsPrep]

Hi Ahmad! Those are a way of symbolizing the quote or quotation ("") for whatever is being said either because one is directly quoting someone or because one is using the exact word or phrase that is commonly used. It is this latter case that I use the "quotes" symbol here :)

[@nataliiaproshunina-lc5gm]

HAPPY TEACHING, CHAD! GREAT CHANNEL!

[@ChadsPrep]

Glad you think so!

[@joylynnpoppyruin3186]

Thank God I found a chemistry saviour 🙏

[@ChadsPrep]

Glad you found us - Happy Studying!

[@kawaiidesuwu7286]

chad u are such a chad for this i preciate u

[@ChadsPrep]

Glad to hear it!

[@SinmisolaJohnson]

My textbook honestly looks like something Einstein probably can't understand. Thanks for simplification.

[@ChadsPrep]

You're welcome

[@ilkeryılmaz-m3z]

you are really lighting up the darkness

[@ChadsPrep]

We all have a part to play - Happy Studying!

[@angeloson2250]

Thanks Mister Chad this lesson was bothering me thank you Mr.Chad

[@ChadsPrep]

You're very welcome ANGELO Son! Glad it was a timely release!

[@antoniorodriguez6253]

Are XeF2's electrons 120 degrees apart? And if so, does that mean they cancel out or how come it does not seem like they play a role in polarity?

[@ChadsPrep]

the lone pairs are indeed 120 degrees apart and spread equally therefore cancelling each other out

[@Mekdes-o1j]

Thank you so much chad

[@ChadsPrep]

You're welcome

[@mikey002]

very helpful brother, thank you

[@ChadsPrep]

Very welcome - glad to hear it!

[@studentshir3457]

So clear! thanks!

[@ChadsPrep]

You're welcome.

[@ilkeryılmaz-m3z]

u r awesome dudee. ı appreciate 🙏

[@ChadsPrep]

Thanks for saying so.

[@humamwatersonii1313]

I realized this now but you really fit the descriptions of Walter white

[@ChadsPrep]

Shhhhh - No one must know!

[@amansisagirma3446]

i want to this lecture note if any

[@allannhlanhla]

Sir, the pinned comment which says that the dipole lines are drawn towards the hydrogens instead of oxygen, what does that even mean? Isnt that how its suppose to be like the other examples you did in the video, how does it become any different? I am confused.

[@ChadsPrep]

The arrows drawn that represent individual bond dipoles should properly be drawn from the less electronegative atom to the more electronegative atom. In the case of water that would be from hydrogen to oxygen. Around the 17:00 mark, you'll see that I drew them backwards. Hope this helps!

[@allannhlanhla]

@ChadsPrep I see. If so, then why is oxygen our central atom and not one of the hydrogens since they are less electronegative? Or is this an exception when dealing with hydrogen?

[@allannhlanhla]

Ohhh, shucks, I just remembered that Hydrogen can only accommodate 2 electrons from your previous video, now it makes sense! Thanks!

[@ChadsPrep]

Excellent!

[@yagirlliizziie]

I'm so confused because in C2H2CL2 my professor said that because the vectors started and ended in the same place when you draw them out, that they would indeed cancel therefore would conclude no dipole moment which means also it is a non polar molecule. Could you clarify please.

[@ChadsPrep]

Hi Elizabeth! I think you may be confusing CH2Cl2 (in the video) and C2H2Cl2 covered by your professor. Note that these are not the same compound. CH2Cl2 has a single carbon which is sp3 hybridized and bond angles of approximately 109.5 degrees. If the Cl atoms were 180 degrees apart, it would be nonpolar, but since they are just 109.5 degrees, it is polar. C2H2Cl2 has 2 carbon atoms that are double bonded to each other. There are actually 3 possible isomers for this compound: 2 are polar and 1 is nonpolar. If both Cl atoms are bonded to one carbon and both H atoms to the other, then the molecule will be polar. The other option is for each carbon to be bonded to 1 Cl and 1 H atom, but there are still two isomers possible, cis and trans. The cis isomer has the Cl atoms oriented only 60 degrees apart and is still polar. But the trans isomer has them exactly 180 degrees apart and is nonpolar and I'm guessing that this might be the isomer your professor covered. Toward the bottom of the page, you can see a comparison of these last two at the following link: testbook.com/chemistry/physical-properties-of-alkenes Hope this helps!

[@yagirlliizziie]

@@ChadsPrep my apologies, you’re right. I’m using your videos to quickly review before I take the exam and overlooked that. 🤦🏻‍♀️

[@ChadsPrep]

@@yagirlliizziie Hope you do well on your exam.

[@banatkhalfan1241]

Perfect

[@ChadsPrep]

Thank you