Chemistry Tutorial 6.02c: Molecular Polarity

[Iwantkababnow]

you are amazing , thank you

[Oreooo13]

It helped me soo much!

Thanks from France

[77DeuceMan]

Thanks I get As on all of my tests because of you!

[susieadoresmac]

Wow it actually makes sense now, thank you!!

[Xeorth]

Thanks so much man! Some last minute stuff before the exam, sure helped out my understanding a bit.

[juicygurl789]

Thank you so much for this! I really appreciate people who put up videos like this on youtube!

[Swagasaurusable]

You sir, are a God amongst men.

[Chickencharmer12]

This video is amazing.

[TheRandomSkillz]

My teacher did something like this, but she just said it goes up or something, and I'm thinking, what happens if you draw the wrong element at the top lol, she barely knew what she was saying.

[water5000]

THANK YOU SOOO MUCH!!!

[icyua6om]

how do you tell which compound is more polar than another?

[GanstaDogProductions]

you are god

[fuckyoubitch098]

Isn't the electronegativity of Cl 3.0? not 3.2

[MarkRosengarten]

@fuckyoubitch098 Every reference I have says it's 3.2, including the New York State Chem Reference Tables.

[fuckyoubitch098]

@MarkRosengarten Ohh, in class we got a chart and it said Cl is  3.0 so I got confused, guess my teacher made a mistake

[MrDJGoodman]

@MarkRosengarten How is CO2 nonpolar? I need some help

[brahdahman1]

@fuckyoubitch098 yeah its 3.0

[TraceyWinn]

Thank you so much!!! when I become a dentist, you are welcome to all free oral hygiene needs!!!!

[star123410]

this really helped me...so much

exam tomorrow.

thank you. thank you thank you thank you.

[leftcoast562]

finished with a bang lol

[UserPicked510]

Say you have more than two molecules. Like BeF2 or something. How would you determine that?

[jabajub]

it's like all chemistry teachers at high schools suck. There are better teachers on the internet.

[MarkRosengarten]

@jabajub I AM a high school chemistry teacher! :)

[Cramerica66]

@jabajub awkward.....

[jabajub]

@Cramerica66 lol yeah.. awkward.

[EriksJanie]

What about SiCl2F2. Its polar, but not sure why...

[aczacha]

thanks for the help man cant show my appreciation enough! you're the reason i'm going to ace this chemistry test

[jdortiz86]

Your the bomb teacher man!!

[xXSherviNXx]

why can't my teacher teach like this ?

[20raeali12]

Thanks so much! this eas very helpful :)

[EstiiT]

wow i didnt understand anything my teacher taught me, now i do! thanks!

[MrsS2JAY]

omg i didn't understand this thing since term 1 but now i understand it through your teaching :DDDD

[LordAlorad]

Thanks man really helpful

[physhgrl37]

So helpful!

[klaraklaraklara94]

Again, you are amazing! I finally understand.

[saturos13]

U can Louis Dot Structure to (i think ) to figure out if its polar or non polar Anyway Thanks Why cant be my Prof be like that guy

[PacManSaviour]

Thank you very much!!

[tennisguy71]

@MarkRosengarten what about a molecule like ch2cl2? there are two lines of symmetry, however, the molecule is polar due to its molecular geometry and tetrahedral shape (there is a dipole towards the cl), is there a trick to bypass these kinds of instances? or do i have to take more into consideration and just use symmetry as an aid? please respond asap!

[Anastasia231]

thank you sir! this helped a lot... 

[jacsoccer7]

in a pyramidal molecular arrangement (one lone electron pair), will the overall polarity of the molecule be polar? and why? Thank you so much

[dark3nangel]

my teacher said that RnF2 is nonpolar...but there's only one line of symmetry that can be drawn :(

[MarkRosengarten]

@dark3nangel Radon difluoride has the structure F-Rn-F, which is two lines of symmetry. You're not slicing the LETTERS R and n in half, you are slicing the molecular structure those letters represent in half. That being said, it is theoretically nonpolar...but one article I just read said there may be a chance the bond is actually ionic.

[dark3nangel]

@MarkRosengarten The way my teacher taught us to do it is to fill in the octects for every element by giving each element 4 dashes. Then compare the drawn pairs to the actual pairs (8+7+7=22/2=11). And since there's an extra actual pair compared to the drawn, we add a lone pair to the central atom, which means that radon should have 3 lone pairs, right? That would mean that it's not symmetrical :(

[ruerukun]

@MarkRosengarten sir i thought noble gases doesnt react with other elements? please enlighten me T_T

[MarkRosengarten]

@ruerukun There are always exceptions and they are almost always products of laboratory experimentation. Radon is especially susceptible, as its valence electrons are so far from the nucleus (and with the shielding effect of the inner shells weakening that attraction between valence shell and nucleus as well) its first ionization energy is 1037 kJ/mole...difficult to overcome, but not impossible...especially if you are using fluorine. Kr and Xe can also be forced to bond to fluorine.

[soccerfc123]

Thank you so much!

[mearbearmerin]

thnk u soo much ur a lifesaver like no joke

[jennabenna200]

Thank you SO much!!!! You are a fabulous teacher!!

[lizvalen0420]

thank you soooo much.. way better than my teacher

[krisb781]

how do you know the electro magnetic charge without a chart? What I'd like to know is:In terms of polarity, how can I quickly determine which IM force a compound is just by looking at it?

[weststep]

Thank you SO SO SO much :) Keep making these videos, they make SO much sense :) :) :)

[lil1red1984]

WoW!!! This made more sense than when my teacher explained it! Thanks :)

[waderade08]

Very informative thank you

[avafreak252]

i love you

[Onitori206]

You just took hours of trying to figure out polarity, into getting it in 4:38 minutes. Thank you!

[No001able]

its ok i worked it out.. put still .. this stuff is horse shit hahhaha. my teacher is F&%$

[MarkRosengarten]

@No001able Perhaps a career in chemistry is not for you, but don't dismiss it as horsepucky. Nearly every convenience you have in this modern world comes from chemistry. Without chemistry, technology, medicine, cooking and so much more would still be in its infancy.

[t1n26]

@MarkRosengarten It's true that without chemistry everything will be in its infancy.. but because of it and technology, we're living in a toxic environment... starting from pesticide, hydrogenated vegie oil, msg, colouring, gm foods cleaning products, etc...

[MarkRosengarten]

@t1n26 That's not the fault of chemistry. That is the fault of people who seek short term profit over long-term viability. Knowledge is neither good nor evil, only the purposes to which people put that knowledge can be good or evil. It is up to the individual to decide how they are going to use their knowledge. Corporations have decided to use it to plunder the Earth in favor of short-term profit and so in the long term we all lose.

[No001able]

why is so2 polar and co2 not? the diagram is almost the same :S i really dont get this ...

[insanic1]

@No001able CO2 is nonpolar because of it's symmetrical linear shape. The two O atoms are more electronegative than the central C atom, so the two polar C=O bonds each have dipole moments going in opposite directions. Therefore, they cancel each other out leaving a net dipole moment of zero, making the molecule nonpolar.

[sakocsulb]

wonderful explanation

[vesh93]

Thank you so much for making all these videos. You have really helped me to understand chemistry better :)

[chanelchain]

Thanks a lot! Wish my professor explained things like this..

[sergefabregas]

um PH3 has one line of symmetry and its non polar WTF? its trigonal pyramidal please explain

[Theheartzofmen]

I don't understand why you need to draw lines of symmetry if you already know the electronegativity!! Can someone explain please

[MarkRosengarten]

The polarity of a bond and the polarity of a molecule are related, but are different things. Bond polarity only has to take into consideration two atoms. Molecular polarity takes into consideration every atom in the molecule. You can look up electronegativities of every atom to see if the distribution of charge is symmetrical or not, but the lines of symmetry method works just as well, if not better.

[Schtavanee]

THE BEST, will subscribe!

[TheSanghavi]

I dont even words to express my feelings because u really saved me on my exam day.. i really was so mad bcause my teacher literally dint teach ME ANYTHING..

THANK you so very much

[coffeeforcake]

@TheSanghavi ditto. my IB chemistry HL exam is in just under 2 weeks and our teacher didn't teach us anything in the past 2 years and we had the most horrid textbook :S

[awlynmckay]

you're way better than my teacher!

[jacqulene]

He should teach other college professors how to teach..

[ChadBroChill5]

Simply. Amazing. Great. Job. Period.

[strawberrywithcheese]

BEST explanation of polar and nonpolar! THANK YOU THANK YOU THANK YOU THANK YOU THANK!!!! Keep it up!

[romania4uluv]

Yey! I'm subscribing! You're a good teacher!