Lewis Structures and Formal Charges Practice Problems | Study Chemistry With Us

Practice drawing these lewis structures and don't worry we will go over all the answers step by step. This video will explain how to find the formal charges of each element in a structure, what formal charges are best, and why formal charges can be used to draw the best lewis structure.
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you are my savior!! My chem slides didnt even mention this part and im paying nearly 1k for this class. Thank you for helping other students especially during this pandemic where having a one on one with a professor is difficult nowadays.

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Jesus Christ is our Saviour

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Need to find a better class I am sorry yours is bad.

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Ikr!!!!! I have a short test on these tomoro

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This was SUCH a big help!! Thank you so much!! I'm sad that you don't have more views on this! Everyone needs to watch this video! You're an amazing teacher, thank you very much for helping us all! :)

[@cmlf74]

This was a HUGE help for my incoming exam! Thank you so much! Love from Italy

[@PhucNguyen-cd2rj]

Thank you so much. I just found this one when I am very stuck with Lewis structure

[@carolgiron143]

I just found this video, THANKS! I wish i had a teacher like you, you are awesome!

[@proudblkqueen1067]

Your formal charge equation I prefer over the book! Thank you so much I understood it better practicing with you.

[@stephysamuel4325]

Omg I can understand this more easily than my teacher's explanation. Youre a life saver! Haha

[@lucyedubio2826]

Yea Me too✨✨

[@sarahbender8251]

Thank you for your content! It has been very helpful! I actually am confused about the very last problem. Why wouldn't nitrogen and oxygen have a double bond and then fill in the lone pair for oxygen? When do you use double bonds versus lone pairs?

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You are AWESOME! Having a student sitting in was super helpful, too! College life saver

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I commend you Melissa. I've never seen a youtube tutor take the time out to work with other people. You've definitely taken it one step further. And, in the process it helped so many more.

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Thank you so much for doing these! It is like getting one-on-one tutoring, and your student asking questions and you including your answers helps so much more than just someone talking at me the whole time. It is so nice. This is a lifesaver find on the internet for me!! xD thank you!

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What is the device you use to show this awesome exercise online?

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gracias!!

[@arivogue5493]

SO HELPFUL.

[@patz8995]

I can't believe this is free to watch, thank you so much!!!

[@zahraassarian834]

Okay so my question is you said that the central atom has to be zero and if you get it possitive the structures wrong In NO3- my octet is correct and the number of electrons but my central atom formal charge is +1 and I can't add a second double bond to make it zero because N is not a exception and can't have 5bonds what do I do?

[@pockeystick]

How do you know when to use formal charge. All I can remember is phosphate and sulfate require. I understand the point of having zero charge

[@HassanatuSamura-sd8bn]

You are the best ❤❤❤❤❤❤

[@reginas4009]

Hi, thank you so much I get it more! But one question, I thought that the formal charge formula looks like: FC= #valance electrons -(#non-bonding + 1/2 bonding electrons) because that’s what I’ve been learning. So is the 1/2 not necessary? Thank you so much though !!!

[@danielhonour-god4916]

1/2×5 is the same this as 1/2×5/1 So the 1 times the bonding electrons

[@kristinecarter869]

I literally have an exam today and this just saved me. Thank you!!

[@joshcowles2745]

At 7.01, how come the oxygen atoms have 6 lone pairs of electrons attached, as well as the one bonding with Sulphur, which adds up to 7, if it only has 6 valence electrons?

[@hassinagayapershad7402]

I have the same question

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Thank you so much for sharing this. I am a mother of 3 (all under 4) and I work! I am older too ha ha, so I appreciate your work and how fun you make chemistry!! I will definitely subscribe to your channel. Thank you, again!!

[@rohanmishra1366]

Please tell me about NH3+

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It always takes me so much time to get myself to sit down and actually study for chemistry and you always help me in completing my studies. Thank you so much!!

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Melissa, I grew up in a cult where we weren't allowed to learn Science at all. I recently started college and was terrified of how I'd do. Over the summer I watched all of your videos to prepare and I just took my first Chemistry test ever and got a 95%. Thank you!!!!

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wow

[@jessicajane2400]

On the last example, why couldn’t she have a triple bond between the N and O?

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you're awesome!!!!!!!

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I'm sure with this, I'm not failing my tests. Thank you so much... I can't believe I fully understand what has been giving me headache, I'm so teary right now

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I'm so greatful, you helped me with my chemistry exam next week...

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This kind of video set-up is super helpful! Thank you Melissa

[@fre672]

Can you make a video about functional groups? PLEASE AND THANK YOU!!!

[@bassemtawil9528]

A very perfect way of showing the student solving the problem and as the student moves on, giving instructions. My students learned a lot from that. Not many have a youtube whereby the student is active solving a formula. Very very very good. compliment.

[@nhlanhladuma476]

you've made this more clear. Thank you Melissa

[@ria3t119]

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[@silashollis6630]

On the NH2OH problem, could we have triple bonded oxygen and nitrogen with oxygen having one lone pair?

[@tuonghoang7251]

no, because in this Nitrogen will have 10 electrons around it and it cannot expand the octet.

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What app do you use?

[@enriquemejia8189]

It would nice to have an OCHEM basis video.

[@ganshyammaharaj1]

hey i’m confused with drawing CN^1- could you please help me

[@briannarosales518]

You're the best!!! You literally NEVER fail me :)!

[@TheThorRs]

any have an idea why the last question at 27:50 can't have a double bond between the Nitrogen and the Oxygen with the Oxygen having 4 electrons on it still

[@bone5200]

Can anyone explain when she does [SO4]-2, why sulfer does not form only 2 bonds? i thought since it was in group 16, it would only want to form 2 bonds, not 4. Thank you!

[@jabtechnologies873]

lol funny fact i just discovered from your video e.g the ,SO4 question, that since we already know the number of ve of s, and it being on the middle means it has no lone pairs therefore the number of bonds required will be the difference between 6 and 0 which is 6, hence we will require 6 bonds in total between all atoms after which we can add the lone pairs #32 total😅😅 f.c = 6 - (B + 0) = 0 therefore 6 makes the equation 0😅

[@AG-kn9gn]

What do you do if, in order to make the central atom have a formal charge of zero, you can't meet the octet rule? Which is more important if you can't do both? For example- CCl2. To make carbon have a FC of zero, carbon will be left with only 6 valence electrons and carbon is not an exception to the octet rule.

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Do more organic chem please

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Melissa the wise giver❣️❣️🕊️🕊️📝

[@raeesadhorat2170]

These are brilliant thank you so much, you have no idea how much youve helped. and you explain everything so well

[@josephmpundu3085]

This was really helpful.. uhmm in drawing lewis structures there's no such thing as disobeying the octet rule..??!

[@ezbuz]

why does cl go next to C and not next to H??? I dont know if my question makes sense lol, but like I wanted to draw the hydrogens around the carbon then put clorine next to one of the H but here you say to still have the hydrogens around C but leave a space open to attach that Cl

[@graceorji6423]

Their is a trick I got from this whole lesson That is ,that when their is just a single minus sign that means I will have just one single bond in the structure and that also implies to the sign of minus 2 Thanks for this great video

[@goulds514]

You saved my life!!! Thank you!

[@Rakshana-zb7ww]

Ma'am how can we draw lewis dot structure for Br3O8 ma'am? can u pls explain it?

[@mmm20033]

I didn't understand why the example of bromine is an exception. It's not from row 2, is it?

[@tashxrappos]

it's the other kind of exception, which includes a lot more elements

[@brionnar.clayton552]

Hello Melissa, this video really helped out. Thank you!

[@palpyteen5549]

IF5 problem: If there’s a total of 42 electrons, why were only 40 drawn?

[@MadhuraRanade-i4o]

Extremely useful video for my students. Make more on other topics also !

[@estheralaba1195]

Melissa pls explain why sulphur is having 6 bonds because it only makes a bond

[@davidbikumbi5981]

Thank you very much, no more questions about this again.

[@katsparrow2172]

What do we do if the formula has an element like Ti in it? Like TiCl4

[@fabianarodriguez.]

THIS MAKES SO MUCH SENSE NOW THANK YOU

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Thank you soooooooo much!!!!!

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Melissa is the best teacher I have ever met. Thank you so much for making the effort to change our lives!!

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Video was so helpful! Thank you!!!!!!

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Everything made sense ma'am you are amazing ❤️❤️❤️❤️

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I am from phillipines and an I.E student from pup, thank you for having a detailed discussion about this topic especially now a days, we're just finding our own way to learn by ourselves and tbh, it is really hard.

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GOD BLESS YOU OMG I'm taking summer gen chem at my community college rn and its been so stressful the professor barely has time to cover everything so she had to rush through this unit and I was honestly trying not to cry on the way home 😭 watching this video definitely cleared up a few things for me and I'm feeling a lot more confident, my exam on this is in 2 days i think i need a little more practice and ill be where I need to be to get that A !!!

[@AnimeProduction101]

ugh. IDK if my teacher made mistakes in her study guide, but I'm following these videos and I get your answers right, but when it comes to my professors work we have difference answers. :( I'm getting so frustrated!!!!

[@yasmeenyas4056]

Thank you for this video. However, I just had a quick question I thought that the central atom always has to have a charge of zero. Because for No3- the charge on the nitrogen is 1 and thats the right structure. So how would you know if the central atom is supposed to be zero or have a charge on it? Thank you in advance

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Really helpful 🙏🏼♥️ I really like these kind of problem solving videos

[@sarahjhnsn]

THIS VIDEO WAS A LIFE SAVER OH MY GOSH TY

[@走言走语]

I applied the formal charge rule and in most cases, it worked. However, it is not working for NO3-. I thought there should be 5 bonded electrons attach to N but the correct one is actually 4 bonded electrons attach to N.

[@awukuemmanuel5490]

You are a great teacher 🤗

[@kellyhighmore2982]

Thank you melissa it was really helpful!!❤ i could nt understand one part at 24:48 why one of the Fluorine atoms have only two lone pairs i understand why the other Fs have 3 lone pairs but i don t get why this F has 2 lone pairs

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The girl on the bottom looks like Supergirl from the tv show

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Have really understood wooow so happy thanks mrs

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Thank you... I have just finished my quiz successfully. Since now, I am your new subscriber.

[@aayeshfaridi9442]

20:49 does Br not have just one lone pair? why is it 2?

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Really you are so good your explanation is very very good and when you was teach I just kept looking at you honestly you are so good teacher and my guide

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Melissa, you put in a lot of sincere efforts in preparation and lucid teaching.. Kudos..

[@gracesan261]

I got all of it just right. Thanks!

[@glenpowell3878]

Thank you! have my finals tomorrow.

[@Lina-vf1ky]

Thank u very much, that helps me alot, this is the first time i understand why there are more than one Lewis structure for polyatomic ions.

[@shelsyaragon1062]

HIIII Melissa, I just wanted to ask if it matters where we put the hydrogen for the oxygen in the last problem?

[@ruchikamukerjee3720]

Thanks, I have better understanding for formal charges after watching your video.

[@TogogaHCMTMahiber-n8c]

Can u workH3O+,p/s?

[@matthew_cramer]

For the last one, does OH need to be done the way she did it in lewis structure or are their other possibilities? Like having 3 H around N and an O on the right. The way it was written out kind of explains the way she did the lewis structure but I was just wondering if it's allowed to do it other ways or not.

[@30kUzi]

maybe a bit late but you have to bond them the way they're written, so like the 2 Hs would be around 1 N and the last H on the O

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I really get to understand chemistry watching your videos You like 💯 Amazing

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The notes are so pretty I can’t stop looking and by extent I’m actually learning!

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I have a chem quiz tomorrow on Lewis Dot Structure and I was super worried about it, but now I'm not worried at all. Also, I never comment on youtube videos but you are such a great teacher that I had to say thank you!

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who else think shawty with the glasses is bad?

[@Iddo97]

why is it more favourable to have a neutral formal charge on the central atom? do you have a video about this?

[@grey_beard_birder]

Using this adding formula instead of the fraction formula is so much easier. Thank you.

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thank you so much I went back to the uni after 3 years dropping off and was forgetting all the chemistry I learned back in high school, this helped me a lot. : )

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Thanks from India mam