Redox Reactions

[@pomegranatehoneydews]

Sal reminds me of the father I always yearned for, someone who actually guides and assures their impressionable youngster. Someone who can teach me scientific endeavour, lavished with comedic remarks that are a sprinkle- nothing to take away my focus, but to keep my attention with a quirky analogy. Because of him, I've begun to enjoy mathematics and truly appreciate the fundamentals of science and technology more than just an abstract interest and admiration. We are lucky to have this sensei to assure us.

[@muffincita5]

Damn. I couldn't learn this in a week, I learned it in 8 minutes. You're too awesome! Thank you.

[@joelcastro3238]

It's funny, I go to a 75 minute class twice a week just to NOT have this explained to me. Meanwhile 15 minutes later on this video, the material turns out to be very easy. Why is my money going to this professor....?

[@Filipinogenetics]

I wonder that every time I learn on the tubezz

[@iMusikkForeva]

exact same story but 78 minutes instead 😒

[@oglow100]

sal you are an amazing teacher!! thanks to you i have learnt so many things. Immunity, calculus, trigonometry, redox reactions, stoichiometry, and a lot more!!! Sal you deserve a nobel prize the way you have helped so many people achieve higher grades in school and uni definately qualifies you to recieve one!!!

[@eleazaremmanuel7112]

OIL-RIG = Oxidation Is Loss Reduction Is Gain

[@bryannguyen658]

Yeah, I like that

[@thiagocunha1368]

Hey guy, I'm brazilian and it was the most simple explanation that I have ever seen. Thank you very much

[@victoriacruz7254]

THANK YOU for explaining this so clearly.

[@specialtriangles]

Your voice...it's so soothing. It makes me LEARN things...

[@Sugarskulls_forever]

You're calm. You speak at a good pace. And I learned how to do redox in 14 minutes. You are sent from the chem gods. THANK YOU.

[@nickisbad]

I really like how you explain the little things to us. Not like other teachers that expect us to know most things already. (Y)

[@kaylaadams6417]

Thank you! I complete school via correspondence and learn almost entirely from a written text. I was so confused about Redox reactions before watching this video, but now I am all clear. Thank you for articulating this lesson with such clarity.

[@karaobn]

THANK YOU!!! After 6 years of studying this... I can finally grasp it because of this video.

[@SoggyTeeV]

You are an absolute legend!

[@BlueBentley426]

God, he makes it so simple. I don't understand my chemistry book or my instructor. Thank God for these youtube videos.

[@liv2srf]

Thank you so much! I basically tore apart my textbook trying to understand this and you explained it perfectly and eloquently. You're amazing, thanks again!

[@BlitzBets-h2e]

wow.. tried to find a video that i could actually learn this stuff and you go beyond my expectation. Thank you!

[@skarpengland]

I view Electrons as small, negative, crying babies. You feel pretty reduced when you recieve one. You feel you can breathe when you get rid of one (Oxygen-ish)

[@ELMKTF]

Excellent video! I was so confused about Redox reactions but this helped tremendously!

[@bryannguyen658]

My chemistry teacher doesn't explain good but watching this video makes it better!

[@Leena20121996]

Thanks a lot....i was just going through the text book pages and my notebook blankly without actually understanding anything.....u made this topic simpler for me to understand....i m having my chemistry grade 11 final tommorow and i was afraid i wont get this topic but now i feel so relaxed....Thanks a lot!!! I Wish all teachers could teach like this....

[@2222ela]

God bless you guys for doing this :) I am so grateful for your videos they are wonderful. Your videos is what helped me get through this course and get an A Thank you so very much

[@sabzz23]

GREAT VIDEOS DUDE! Keep it up you're helping a lot of people and your bettering the future of our world!

[@RapidShot48]

This single video has helped.me understand.everything about redox dude you are amazing

[@cazum8]

i came for minecraft, i got SCIENCE

[@naseerahvj]

I totally stumbled on this by accident, and then realized it was Khan at the end of the video. I remember listening to the Ted lecture, amazing stuff Mr. Khan!

[@MaelstromGuy]

Thanks a lot man, i wish my teacher was like you, we were on how to balance redox for dummies by 20 minutes and then 7 exercises to be done on 10 minutes, i got 1 out of 7, the whole class was just lost copying each other, the visuals were great, watching colors and connecting it with the periodic table was enough for me to understand.

[@DeborahJB]

Beautiful! I have never seen this explained so well. Thanks.

[@SuperElf21]

thanks a lot! i've asked a lot of people and this really made me understand our lesson ^^

[@Forgive595]

I find it weird when I see people dislike something when, in fact, there is nothing to dislike about it. I think some people press the dislike bottom without even seeing or understanding what is in the video. Thank you very much for uploading this video. It is really helpful.

[@616109q]

ur da man ive been trying to figure this out for 2 weeks and u did it in 14 minutes ur amazing

[@aquafrsh1]

thank u so so much! i cant explain how much this helped! your the best

[@Bang013]

your explainations are so easy, and understndable, please keep uploading more science

[@celenameg]

This is wonderful. I just got a 66% on my Chem 101 midterm and I feel SO MUCH BETTER about chemistry after watching your videos. I might actually get a great grade in the class now :D Dont forget to be awesome.

[@naveenkaur4675]

Thank you so much for this video. I had a mini epiphany during this video. My Chemistry teacher really confused me but you made it so easy!

[@scratchcue]

You are my go to guy for chemistry and calculus. Thanks for all your help!

[@queenlikepuma]

Thank you!! Could not have gotten through Chemistry without your videos. I'm not exaggerating either! p.s. I could listen to your voice all day :)

[@alish911]

so to everyone, the oxidation numbers are: H=1, O=-2, Al=3, F=-1. memorize those. thank you my man, excellent job

[@2PacAnd2PacOnly]

I love you man, you make Chemistry look to easy Thanks for this video !!

[@cyimmie]

a really clear and concise explanation to a topic that has confused me for a long time. the biological association you made is actually helping me out for my orgo class. Thanks for helping me tie it all together :)

[@Chanikanist]

Thank u :DDD This makes so much sense ! U've just made Chemistry like a piece of cake :D !

[@ryanuhrey8686]

The "Three Musketeers of Electronegativity." So awesome! Thanks, Sal!

[@antonicoco]

This was great I understand it much clearer than before. Thank you!

[@fleshcookie]

1) divide reaction into 1 oxidation and 1 reduction rxn 2) balance each one of these half rxns by following these steps. A)balance elements other than H and O B) balance O atoms by adding H2O as needed C) balance H atoms by adding H+ as needed D) Balance charge by adding e- as needed. 3) multiply each by an integer to get = numbers of electrons 4) add half rxns

[@borgardan]

Thank you so much mate! This claryfies chemistry a lot... Cheers!

[@yanajoe22]

my teacher make me confuse , but you are a true teacher

[@anokomfan]

thanks so much! i was absent from school when they taught this. but im sure you taught it clearer than my teacher :P

[@Stephanieisblij]

Un-be-liebable. You're a hero! Thank you!!!

[@splitta01]

Greetings from Germany! now i understand it!thank you so much!

[@SrFelatio]

Muchísimas gracias por este gran video. Saludos desde Argentina

[@button7777777]

its funny how the university of youtube teaches better then my actual university -.- great video :D

[@lildevil10142]

It depends on the equation. If the molecule is neutral, then the oxidation numbers, when added together, must be zero. Say you have FeO: oxygen has a charge of negative two, so it only makes sense that iron would have a charge of positive two. Another example would be if you have an ion: FeO+1 would mean that your oxygen, with the constant charge of negative two, would have to be added to an iron with a charge of positive three (-2 + 3 = +1). ..I hope this makes some sort of sense.

[@omardalvi]

I'd learn more watching your vids for a day, than in a week in school

[@mike220890]

In the last two reactions the element that became positive should give away electrons, but the video says that it gain electrons, besides this minor slip this video helps a lot thank you

[@amazonjess499]

This helped me so much with understanding Redox. However, when you were doing the equation saying whether the electrons were subtracted or added you have used a plus sign for both which made it a little confusing. Other than that this video was amazing. Thank you!

[@plasticspoonchewer]

Why can't my chemistry teacher explain things like this? You make so much more sense!

[@AntharesProcyon]

This really REALLY helped me out, thanks! PS: six people failed to understand redox reactions..

[@UnrealTournamentIII]

Really clear and easy, thanks a lot. Pushed the like button.

[@carlosbosco95]

because those 4 electrons aren't part of H2 molecule anymore, they've gone and are now no longer attached to the H2. The point of a chemical equation is to show what a reactant produces. And that reaction produced two H2 molecules and 4 electrons.

[@mennonis]

i got kicken out of chemistry for the rest of the year SO your my new teacher i supose XD really thanks

[@HawaiiJuniorCycling]

I want you to know that you have saved my grade. Thanks!

[@sacumblousi]

Thank you very much! Now I'm more ready for my final exam!

[@supercalifreakinawsm]

The first 2H2 is hydrogen gas, so its neutral, whereas on the other side of the equation, the 2H2 is from H2O, which is neutral overall, but when you break it down, the O has a -2 charge so the hydrogen has to neutralise the -2 charge. Since there are two hydrogens, each hydrogen has a +1 charge to neutralise the oxygen. Sorry if this doesn't help, I probably suck at explaining :S

[@debbieharris4484]

love it...makes it so much more clear!

[@virginialikesyou]

Dear Khan, I know I have said it before, and you're sick of hearing it from all of your adoring fans, but THANK YOU I LOVE YOU THANK YOU THANK YOU THANK YOU OMGOD YOU SAVED MY LIFE WAAAAAA!!!!!!!!

[@livinguntohim1]

I freaking love you!!! thanks soo much for what you do!!! :)

[@yellowyoya]

my test is today, thank you so much for clearing it up!!

[@kyraxx]

Thanks ! This helped me A LOT ! You rock.

[@Ghost572]

This was really helpful thanks for explaining this.

[@power-max]

This 15 minute video was more educational than an hour long lecture of from a professor at LFCC, where I learned NOTHING. That is just sad.

[@Naabenstadt]

Great video! I finally understand redox reactions!!!!

[@SaronMB]

LEO the Lion goes GER Loss of Electrons is Oxidation, Gain of Electrons is Reduction

[@xspsorganization8778]

Based on the explainations i see in the comment section of this video, i would like to say that chemistry would be easier for studnts and instructors if the instructor explained chemistry (which is hard on its own) while writting what he/she is explaining to the students. Try listening to this video without watching it! and you have met my instructor!

[@ashanewettasinghe3636]

You are Amazing Bro, Love you

[@994906038827]

I also was confused when he added the 8e- to the C^+4. However, I then realized that he didn't actually make a mistake. He added the 8e- to the C^+4 side of the reaction. In the oxidation half-reaction, the electrons are (usually?) added to the right side of the reaction and the electrons are added to the left side of the reduction half-reaction.

[@whoisthisandthat]

since it's FeCl2, the Cl2 has a charge of -1 so the FeCl2 needs to be neutralized. So since you know that Cl2 has a charge of -1, which it essentially has TWO -1 charges because of being diatomic, you know that you need a +2 of something to neutralize the negative Cl2.. and then that's where the Fe+2 comes in.

The half equations are extremely counter-intuative, when written out. If Fe has a +2 charge, that means it gave 2 electrons away. But half equation is written as Fe + 2e, which would give the Fe a -2 charge...

Its a lot easier (last example) to write like Fe - 2e = Fe-2

[@Bonfitto]

how do you make this so easy to learn...you are a hero

[@Bakugantsuvai1]

Nice explanation, whatever my stuffy 23 pgs of textbook explains you explain in 30 minutes. We definitly need a KhanAcademy series for AP courses especially for Chemistry, Physics, Psychology, English Literature, and Computer Science on the AP level.

[@SuperKaydn]

great work. even if i come germany, i get what u explain! thank you! better then my teachers, and they talk german :D

[@Em-kc1mg]

seriously, awesome awesome awesome!! now i really understand redox reactions, haha happy!!

[@momsspaghetti1040]

This was really helpful.Thank you!

[@РоманГогешвили]

Red Ox actually sounds like a football team name!

[@gummi3076]

It just really bugs me that it's called a REDUCTION when it's receiving an electron. Have I misunderstood something?

[@jorgepadua5802]

+Regin Kunoy No, it's just really confusing. TO help me a bit, I read the equation from left to right, and the agent that is reduced is giving away electrons. I know, it's really confusing.

[@capbiumteoi7448]

+Regin Kunoy remember that electrons are negative and have a minus sign.

[@trandzuyhieu]

+Regin Kunoy think of this: on a scale going from positive to negative, if electrons are negative, when it receives electrons you are becoming more negative, thus you are further reduce. In reality, it's reduce from its neutral state.

[@trandzuyhieu]

Correct me if I'm wrong during the half reaction. Initially carbon gain 4e- from hydrogen molecules and in the product, carbon lost 4e- to oxygen molecules. Therefore carbon lost 4 e- as a net result . You have carbon lost 8e-. @ 6:09

[@sabirasolaiman]

I had the same thought at first. But we prob. consider initial and final charge of element within the molecule, -4 and +4, to determine # of e's lost/gained. If we were to do it ur way, we'd have 4H(charge 0) - 4e --> 4H(charge +1), which isn't the case here. That's before H bonded with C.

[@GratedArseCheeks]

Hydrogen is ALWAYS +1 (At least in any compound I've heard of) Carbon does often form positive cations, but this is usually in haloalkanes and stuff. :)

[@SinsiAlpha]

It's nice to see a video with + 250,000 views without religion/ politics arguments.

[@BlackF20C]

OMG you are the best Sal!! Thanks!

[@fahadwalker]

haha, loved it when he called N, O, F the "three musketeers of electronegativity". legendary!

[@TheComputerCriminal]

makes perfect sense, thanks for clearing it up !

[@urockit2011]

so. incredibly. helpful.

[@lightning8675]

Your videos & explanations are very good. Much clearer than most can deliver by a long shot. But a comment/question. When naming an oxidizing agent or reducing agent, doesn't it have to be the whole compound named, not just the element? I.E. In the methane example at 8:20, Carbon is oxidized, but isn't it supposed to be CH4 is the reducing agent? Rather than saying carbon is the reducing agent? I checked two textbooks & it looks like they are saying the whole reactant/compound has to be named

[@BTON618]

Khan acadmay!!! You have, once again, saved my ass!!!

[@nicolechambers9485]

absolutely great explanation

[@licengswie]

hey man.....thx a lot! your videos help my A&P and Chem courses.....GBU!

[@TechnoManiac2]

Governments should stop wasting money on schools, but pay this guy to make videos. :D

[@TwistedPencils]

I actually have trouble listening to my chem teacher...dunno why. But all I know is, I don't have a hard time listening to you

[@yomamacold]

you are sooo much better than my bio teacher at school

[@csuhtaeira]

I love this 14 mins tutorial. I learned so much than in our.... (shh.. she never teach)

[@NayrusLove99]

Thankyou! Now I understand this concept.

[@opmike343]

Did you even watch the video? This is one of the first things he explains once he begins to tackle the problem.

[@macmos1]

good thing you have videos on youtube i have a horrible chem professor