Redox Reactions: Crash Course Chemistry #10

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All the magic that we know is in the transfer of electrons. Reduction (gaining electrons) and oxidation (the loss of electrons) combine to form Redox chemistry, which contains the majority of chemical reactions. As electrons jump from atom to atom, they carry energy with them, and that transfer of energy is what makes all life on Earth possible.
Watch this video in Spanish on our Crash Course en Español channel! • Reacciones Rédox: Cras...
Thank you to the following chemistry teachers for their assistance:
James Sarbinoff
Rachel Wentz
Edi González
Lucas Moore
Chris Conley
Addie Clark
Julia Rosinski
Special Thanks to Matt Young at the University of Montana (Geosciences Department, Environmental Biogeochemistry Lab) who helped with the chemical demonstrations.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashcourse
Twitter - / thecrashcourse
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Опубликовано:

21 апр 2013

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Комментарии : 2,2 тыс.

@crashcourse 4 года назад

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

@chellyreverse2235 4 года назад

Stfu

@Inbbnbb 4 года назад

Ok hank and co

@trevorlei4096 4 года назад

@@chellyreverse2235 chill out chelly

@chellyreverse2235 4 года назад

@@trevorlei4096 haha

@AGLaconic 8 лет назад

I wish teachers were more specific in why things are actually happening instead of "thats just the way it is"

@firecollection 8 лет назад

+AG Laconic , i think We don't have enough time on school, it takes time and concentration to teach and learn like that :") they want their student discover "Why ?" as a homework, and sometimes it's not easy because they often play games instead of doing homework at home. But i hope teacher in the future can change that issue.

@muhamadshafiqnilam 8 лет назад

+AG Laconic at degree level,we just have to memorise the stuff and parrot it back on exam test,only when you are doing your master degree and Ph.D.,we will learn why things happen.That's what my lecturer always said to me when I came to ask the question.

@josiahklein70 8 лет назад

Most authority figures say that. They hate it when I ask why because they, themselves, don't know. Try asking yourself, instead! You're bound to get a better answer if you look.

@megangilmore9355 8 лет назад

@meganpennington343 10 лет назад

Funny story about redox reactions. Did you know that combining Hydrocloric acid and CuSO4 makes chlorine gas? Did you also know that accidentally creating chlorine gas on your first day of grade 11 chemistry puts you on your teacher's watch list for the rest of the semester? I didn't know that before, but I sure do now.

@tensequel7818 5 лет назад

lol did anyone die

@andrewminczeski8528 4 года назад

As a chemistry teacher, why did your chemistry teacher give you hydrochloric acid on your first day of chemistry?

@loganscully373 4 года назад

@@andrewminczeski8528 its just hydrochloric acid, I've been getting it since I was like 12

@nathanyein9968 4 года назад

@@loganscully373that's sarcasm right?

@loganscully373 4 года назад

Nathan Yein nope

@TheNextNotch 10 лет назад

I don't know who this guy is, but I will find him and i will hug him.

@kobewankenobi8926 10 лет назад

His name is Hank Green

@leodaza3 10 лет назад

if you like this, you'll like his other channels too! :P

@wewemcrhyne 4 года назад

I think he’s saying “who’s Hank?” As is asked on all of John Green Vlogbrother videos!!!

@chellyreverse2235 4 года назад

I'm writing this comment so u try and remember when u wrote this and how uve changed

@TheNextNotch 4 года назад

@@chellyreverse2235 I'd still hug him

@ohheycrystalhey 10 лет назад

Hank noooo you're making the same mistake that my math teacher makes. When you say chemical equations, please write them down or have them floating in the air above your head or have them somewhere that we can see! If you say "ammonia plus acetylaldehyde forms blah blah" it makes perfect sense in your brain, but it's difficult for me to focus on and understand the components of the equation unless I can see them. Please keep the equation visible as much as possible! It would help a lot!

@nnaeem10 5 лет назад

Turn on CC

@yuxian1521 5 лет назад

did this lesson become useful to you after 5 years?

@nicholasdsilva1832 4 года назад

amen

@carrie-annethomas2778 4 года назад

@Goncalo Oliveira Since there's almost 400 likes on that comment, I'm gonna guess she's not the only one. xP

@disconsolate3235 4 года назад

@Goncalo Oliveira why would they bother commenting when liking the comment means they agree with it already?

@RhyminCarly 11 лет назад

As it is now 1:30 AM, I have a chemistry final exam in about six hours. Thank you, Hank, for being a fantastic teacher. However, redox makes me feel rather ill... For most of the video I was like, "Okay, yeah, that makes total sense! I can DO this!" and then chemistry decided to do what chemistry does and become exponentially more difficult just when you think you've solved it.

@letsseepaulallenscard.6604 8 лет назад

at least i know now that a Portmanteau is a large suitcase

@mkshnv7085 4 года назад

Porte-manteau is a coat rack and suitcase would be translated as "valise" I guess

@aryotaheri7421 8 лет назад

I swear this video has saved more lives than the Haber process. Thank you Hank

@mayahattangdi3270 7 лет назад

hahahah yessss

@marweeo 7 лет назад

well i learned something today

@jokar1013 7 лет назад

aryo borzin Taheri this video also killed more people's dreams than the Haber process... they thought they knew chem

@israelhernandez53 6 лет назад

omg yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeessssssssssssssssssssssssssssssssssss

@designholicmuaz7780 6 лет назад

This comment made more people laugh than KSI

@alanamesko8717 4 года назад

you can also think of reduction as the reduction of CHARGE that occurs when an atom gains electrons. When an atom starts with a charge of 0 but gains an electron, its overall charge is REDUCED to -1

@GamePhysics 8 лет назад

Yeah... I'm failing this exam. Thanks for telling me, crash course.

@samymucho5494 8 лет назад

Same...

@GamePhysics 8 лет назад

samy mucho I passed! :D

@BlackIsOut 7 лет назад

lol

@roooose16 7 лет назад

+GamePhysics wow, so much for that.

@imamongthem3422 6 лет назад

i failed

@m35926 10 лет назад

after 5 minutes all I hear is 'blah blah blah'. time to rewind

@cookiecookie8581 6 лет назад

I thought i was the only one felt that way lol

@justice_edits 5 лет назад

@@cookiecookie8581 me too

@lukestevens6114 5 лет назад

Because this is a rubbish video.. don’t bother rewinding go watch Tyler Dewitt’s videos on redox reactions

@LO-qs3sp 5 лет назад

It's rewind time.

@eviolinarts5014 5 лет назад

Welcome to inattentive type adhd 😔

@santelmo5222 9 лет назад

Difficulty level 1000000: increase the speed of the video to 1.5.

@zoejacques3716 6 лет назад

OMG I tried it and you're right it's hard

@theoreticalphysics3644 6 лет назад

oh ive been doing that the entire time... granted that this is just review bc ive got finals tomorrow

@honavaioleti8663 5 лет назад

@the lost star warrior Same. If you can get used to him speaking at that speed, then regular speed sounds normal (maybe even slower)

@shamimaraislam4938 5 лет назад

It is not that hard once you get used to it

@adityaroy9117 4 года назад

@@zoejacques3716 Well I have a test tomorrow and I'm watch at 1.75X.

@Rin-qj7zt 8 лет назад

reduction is totally a name that makes sense. if you gain electrons, the charge has been reduced....

@22Tech 8 лет назад

+Wulframm Rolf thanks fam

@jasonslade6259 8 лет назад

+Wulframm Rolf Only because somebody arbitrarily decided that Electrons would be negative and protons positive. So I guess it works out by complete chance.

@Rin-qj7zt 8 лет назад

Jason Slade that's my point tho. it was supposed to be slightly humorous. twas poorly written tho

@zead9481 6 лет назад

it is really confusing for us new learners so yeah.

@sxge4751 5 лет назад

I’m a new learner, you opened up my eyes

@aasthasharma3820 7 лет назад

crash course videos are the only youtube videos that I can watch for longer than 10 minutes without clicking on another video or leaving or get extremely bored

@sayantanchatterjee3626 7 лет назад

Same

@madLphnt 7 лет назад

check out periodic table of videos.....they have all the elements with examples of reactions taught by an awesome russian/british professor whos super laid back and knows his stuff inside out, Very sweet. and Sixty Symbols is their physics channel

@aasthasharma3820 7 лет назад

ok:)

@varunSharmakvboss 7 лет назад

SAME HERE

@aasthasharma3820 7 лет назад

well i guess it's actually more like 5 minutes

@danielward9376 10 лет назад

Yes if a classroom teacher taught like this it wouldn't be good but it's RU-vid. You have all the information in a concise video that you can pause to think, rewind if you don't understand and even watch a few times if you need to. You won't understand this by watching through it once unless you already get most of it, but it is possible to learn this without any background information, he tells you everything you need. The reason there's lots of information is because it's a complicated subject. If you can't put the effort in to really think about it and understand it, then yes this video isn't going to be helpful

@nicolejudge4516 7 лет назад

Exactly my thoughts.

@abigailplylar5433 5 лет назад

why do you guys all have to be such assholes i mean, come on, some people learn better when they are shown how to do every step and then are able to logically understand why each and every step happens. However, some ignorant, self-absorbed people such as yourself, find it a paramount life goal to make other people feel stupid for having a difficult time filling in the blanks in difficult concepts like the one discussed in this video.

@miaeliza126 4 года назад

It's also free. If you take heaps of notes, practise any equations he does theyre actually really super duper helpful for tuition with no cost

@prototype2013na 4 года назад

@@abigailplylar5433 because people don't understand and start complaining

@RachelHom 8 лет назад

Just remember kids, LEO (loses electrons, oxidation) the lion says GER (gains electrons, reduction)

@okiedokie9557 8 лет назад

+Rachel Hom I really like that!

@crazydang101 10 лет назад

I'd just like to thank John and Hank Green for making these amazing Crash Course videos that have taught me so much about the way the world works. I'm 15, and I love to learn, but unfortunately my teachers don't think I'm smart enough to take chemistry until I'm a senior. I love school. I love learning. I love writing. I'm introverted and a geek. I hope to someday be a Therapist or a writer. I just want to thanks thank you so much for making these videos. :) It means a lot to me.

@prestonwood3561 6 лет назад

It's very frightening that I did not realize this video was released in 2013 after seeing the first animation of our current President... It gives me chills

@SophiaSu52 9 лет назад

You can also think of it as LEO the lion saying "GER" (grrrr). Losing Electrons Oxidation Gaining Electrons Reduction

@coolbeatguy 9 лет назад

Thx I really needed that!

@chancepark6253 9 лет назад

also reduction REDUCES charge

@xAneesaxful 9 лет назад

We use OIL RIG in Scotland haha : Oxidation is Loss Reduction is Gain.

@najeebal-shabibi9394 9 лет назад

Aneesa A also in Britain, I guess the education is very similar

@danishstrikes 9 лет назад

Najeeb al-shabibi I live in texas and we also do OIL RIG :D

@haditmarquez4940 4 года назад

"AnD tHoSe ArE aLl ThE rUlEs" sir i need to remember all of these by tomorrow!! }:(

@itsobvious42 9 лет назад

Having been completely confused in class about this and doing some desperate research at home (no one in my class could help because none of them understood it either) this video (having to break it down, of course) actually made me grin when I managed my first complicated equation! Thank you so much!!!!

@mariahmolina2527 9 лет назад

All I hear is blah blah blah electrons blah blah 😩 definitely failing this test 😭

@mathewmjohn7322 8 лет назад

mariah molina Check out Exam Fear.

@mathewmjohn7322 8 лет назад

Krishna Narayanan Yeah! And you?

@PrincessTanyaBarbie 8 лет назад

+Krishna Narayanan Indians unite xD

@mathewmjohn7322 8 лет назад

Krishna Narayanan Wow, its astonishing to know that you are a girl! No offence, I mean no one could never decipher it through your name.

@mathewmjohn7322 8 лет назад

Krishna Narayanan And yeah, John and Mathew are common names among Malayalees or Malayalis , whatever.

@maliciousmarka 7 лет назад

Quick note: whenever you (yes you) hear about redox, know that reduction and oxidation is occurring (as the name says 'Red' for reduction and 'Ox' for oxidation). When you finish a redox equation, if an element or molecules redox value is going down from the reactant to product side, it is being reduced (but remember scientists are odd which means it's gaining electrons) and when it's redox value is going up, it's being oxidised (meaning that it's lost electrons)! I hope this helps.

@LoLIHateMyNameLoL 9 лет назад

Let's all just give up to life and become non-productive members of society.

@jairustheadventurer3935 7 лет назад

Z Adel NO ☭!

@jetkwan2935 6 лет назад

Let's just kill ourselves so we don't become a burden to society

@shaimamiah 5 лет назад

i agree

@toshido_yamada 5 лет назад

good bye cruel world

@InnerSunshine 9 лет назад

It's not too "fast" it's designed to be rewind and re-watched as you need to. My notes from this video: History of "Reduce" comes from metals being heated-smelted and they got lighter: "reduced". O2 was leaving the metals making them lighter. Today we think about it as electron transfer. O2 is the best oxidizer, pulls electrons off other things "electronation and de-electronaiton" is maybe worse than "redox" oil-rig = oil oxidation is loss of electrons rig reduction is gain of electrons When your cells convert sugars into energy, for thinking and movement, that's redox. Plants doing photosynthesis, that's redoc. Batteries, is redox, fire is redox Modern chemistry keeps track of the electrons. The movement of electrons is the "currency" of chemistry, especially redo0x, who is ahead in electrons, who is behind or losing electrons. Forming of compound molecules is like a marriage. When the bonds on a compound break, who gets the electrons is of interest.

@lindseyvalancius7690 9 лет назад

New goal in life: use the word portmanteau in a conversation.

@nikkilabuckauful 10 лет назад

There is an error at 7:49: They write N2 + 3e- = 2NH3, it is not balanced as there are no H on the left, there are 3 negative charges on the left and no charges on the right and there are 2N gaining each 3e- so in total N2 is gaining 6e-, The correct half-equation is N2 + 6e- + 6H+ ---> 2NH3. Also the second half equation at 7:55 is wrong: the correct one is: 3H2 --> 6H+ + 6e-. Adding their two half reactions: N2 + 3e- = 2NH3 and 3H2 --> 2NH3 + 3e- would give me an overall reaction: N2 + 3H2 --> 4NH3 which is wrong.

@daetsmlolliw 6 лет назад

The electrons are from The hydrogen

@zippyman28 10 лет назад

Simple yet thorough.

@FastestCrafter 7 лет назад

Crash course; bashing trump since 2013

@aasthasharma3820 7 лет назад

Haha

@DudeWhoSaysDeez 7 лет назад

heh

@SS-hv5sy 5 лет назад

i thought they showing that he is a rich guy

@kateorourke6064 5 лет назад

M1FF3D we stan

@benjiwyatt8812 5 лет назад

Graig Simmonette- If you think people who knew Trump actually liked him until he ran, you weren't paying attention. Saying he's not significantly different from other presidents is insanely naive.

@InterrobangActivate 10 лет назад

Thanks really helpful, I never really got this in class. I do feel that Crash course could do with some examples or questions. :)

@hicketre2006 10 лет назад

Thanks Hank! Love your videos. You've saved me many times. To everyone else complaining about his speed: There is a LOT to understand here. If you need to 'get it', then pause the video, analyze the curriculum and do the work. That's the only way you'll get good at something.

@juliapelech4094 Год назад

this man has single handedly saved my grade in so many different classes over the years i cannot thank you enough hank

@lynxdre 8 лет назад

How many people here are rushing for a basic lesson before their exam haha because I am and honestly this video is not as helpful as I hoped it would be :( which I understand because he's just trying to make the topic interesting with fun facts when what I actually need is a actual school lesson... instead of surfing around the Internet

@krlormand2724 8 лет назад

+Lynxlynxlynx Jay Try Khan Academy. They do an excellent job of going more in-depth and also showing example problems.

@davidbliss8352 8 лет назад

+KR Lormand, Thank you. This tip was extremely helpful.

@charlottekraft2657 8 лет назад

Haha this sums up my situation lol

@kumarichhetri7982 5 лет назад

Same here😣

@div_yam2304 4 года назад

This is a CRASH COURSE dude, its meant to be studied much before the exam.

@ronschlatter822 9 лет назад

If I'm following what you are saying, the slide Reduction Half Reaction at 9:36 should show the +1 above the Ag in the compound rather than above the Ag on the product side of the reaction, where it is elemental and has an oxidation # of zero. Love your work.

@jordanorsak938 Год назад

I used to watch this in high school chemistry (because my teacher didn't write any lesson plans). 8 years later, watching this because chemistry is mega important. Thank you CrashCourse

@Toimi 9 лет назад

This actually helped me quite a lot with understanding how redox works, thanks.

@ZiggyGreen123 9 лет назад

How can you hate on whoever named these reactions. In reduction, the oxidation state is REDUCED by the gain of electrons. It makes complete sense.

@27Nichy 7 лет назад

I might yet pass my Chemical Principles retake because of this series. Thank you guys so much, you're my only hope and I have lots of hope!

@shruthibarathan1997 7 лет назад

I read "my Chemical principles" as "My Chemical Romance" oh no

@bigmaninthepants 8 лет назад

For 3 years I havent studied or listened in chemistry. All i do is watch these videos the night before and ive never got anything lower than an A-. Wish my teachers actually knew science like you and didnt respond to questions with "its very complicated" or "its just the way it is".

@amynewell393 10 лет назад

Thank you! I found this video helpful because I have been struggling with redox and now I don't feel as bad about it! It's a fun way to learn! I'll check out some more crash course videos! :D

@Jumpingoutoftrees 9 лет назад

First one I've watched that I felt like I really didn't follow what happened and I'm not so sure I would even with watching it a second time. But I"m sure this would be an awesome refresher for someone who had already learned this before.

@JimNagle87 10 лет назад

Thumbs up if you love the way he says "Noo!" at 5:35

@veronicaecheverria594 7 лет назад

Wow, I love you. Love your humor. Thank you.

@christinespina8819 4 года назад

I am very thankful for how helpful these are, thank you

@rogerdotlee 10 лет назад

I've always had problems with Redox reactions. I still do. This is helping, I can assure you, but I'm still more than a little confused. Ah well, I'll watch it again a few times and the answers will shake out. They always do.

@NeonsStyleHD 9 лет назад

Go over to Khan Academy and watch their videos on it. You'll get lots of examples, and it will be explained fully and you will definitely understand it after watching it. Google Khan Academy, click Start and start learning for free. There's even worksheets if u really want to make sure you understand it.

@rogerdotlee 9 лет назад

I've been to khan academy. It really helped with my studies of Calculus. I don't know why I didn't think of it myself.

@Lainelainehere 9 лет назад

I think it is pretty normal o.o

@MichelCarroll 10 лет назад

This was incredibly entertaining! Thought my review on redox reactions would be dull.

@boringlikeme 10 лет назад

Hank, you're the awesomeness in person. Thank you for existing.

@amandawilliams7488 8 лет назад

You're fantastic. If you were a professor at my college, i'd take your class in a heart beat.

@johnhilbert7640 10 лет назад

Ok I give up. Chemistry is just too complicated. I'm coming back to math.

@joshuawalker5825 10 лет назад

It is never too complicated if you work at it at your own pace. It is just a subject you need to get familiar with :)

@deathstroke7722 10 лет назад

Yes but sometimes you can't learn it at your own pace cuz your professor thinks it hilarious to rush through it and explain very little

@williamloo2265 10 лет назад

aaaaaand this is why I wonder why I even bothered to take summer chemistry.

@alexpeterson3200 10 лет назад

Come on, he said it right there, its 3rd grade algebra. Nothing like trying to apply multivariable vector calculus to non-euclidean relativistic space like what we all did in 6th grade, right? :P

@JoeSmith-bt7wi 9 лет назад

i know how you feel. i have to watch these videos several times; I'll often replay the same two minutes over and over.

@einavguetta3500 9 лет назад

Crash course is a gift for students with teachers who don't give a fuck

@TrishaPartabrai97 10 лет назад

Your videos are amazing! Keep doing what you're doing and thank you so much! :)

@nimeshaamerasekera684 8 лет назад

lovely video. the visual representations were amazing and so easy to follow

@stephclark9308 9 лет назад

So my redox test is tomorrow and I was feeling so lost and confused but this video totally saved me, I MIGHT ACTUALLY PASS IT

@sleigher98 9 лет назад

howd you go?

@CB-sk1pq 9 лет назад

At 10:04 you could see the crash course room from the reflection...

@germas369 9 лет назад

Thanks for a refresher. Definitely helped me out :)

@SarahSkye14 7 лет назад

With 10.5 hours to study for a Chem 2 final after Zoology and Biostats today, Crash Course is the best thing in the world! He's got all the stuff from Chem 1 I forgot explained in a memorable way for visual learners.

@rockingupthewrongtre 11 лет назад

Hi CrashCourse team: I have an idea. I've been following your videos for the past year or so and it's changed my perpective on how i viewed my high school years. I wish I had the focus that I have now, unfortunately those years are way behind me. Thinking back on my lack of focus, I feel like much of it was due to the fact that I had no way of relating the information in chemistry, physics and pre calculus to what i thought would be real life after high school. Having much more experience now

@lindsaymargaret1508 10 лет назад

i always used to think chemistry wasnt that hard... but this is seriously making my brain hurt :/

@peteriyida4485 7 месяцев назад

Bro, your videos are rad and your community crash course is a beast

@dakotaj614 9 лет назад

Love the videos! Keep it up. Great information.

@oldcowbb 7 лет назад

trump before he is a meme

@pauljones3017 7 лет назад

He still is.

@shuriken188 7 лет назад

I believe they mean that CC Chem is joking about Trump before the time in which he was a meme.

@lukeberlin2120 7 лет назад

Do you mean before he is president?

@kuhhchow 9 лет назад

Leora = Lose Electron Oxidation Reducing-Agent Geroa = Gain Electron Reduction Oxidizing-Agent *thumbs up :)

@rebeccahardgrave3921 9 лет назад

Thank you so much you're videos are always super helpful and funny.

@jessicahernandezmorales4664 10 лет назад

Thank you so much. This is helping a lot. :) My professor teaches too fast sometimes, but at least here I can press pause.

@christopherrobinson193 9 лет назад

When you balance the number of Electrons in the N2 --> 2NH3 reaction. Shouldn't there be 6e on the left side? Because 2*-3 = 6e

@swampertblaziken1 5 лет назад

Right!

@alvinmoore308 4 года назад

Yes, it actually should be 6e in each of the NH3 equations. N2 is reduced, gaining 6e, and 3 H2 is oxidized, giving off six electrons.

@MissyS1614 6 лет назад

you explained this better in 10 mins than my college professor did in an hour.... thanks for saving a life

@rellwood86 6 лет назад

The Crash Course Series have helped me ace a couple college classes. Thank you!

@kimbrownct1 8 лет назад

I would love if there was a possible specific crash course chemistry made where it slows it down and goes more in depth. I lost you after oxidation numbers/states and rules. But that mostly because I'm trying to remember undergrad chemistry from 5 years ago now. Love this series so much.

@radhikasewram2316 8 лет назад

3:07 "I like to think of every covalent compound like a marriage... Don't think about it too much." I laughed for about 5 mins ;)

@sameersheikh5301 8 лет назад

Is the guy at 0:07 Donald Trump? If so, then I love CrashCourse even more now.

@Giacomino_ 8 лет назад

+Golam, In Brackets Yep, that's definitly Trump.

@sameersheikh5301 8 лет назад

Matthew Miller Awesome! I love how they did his hair.

@rynsawyer4185 8 лет назад

+Golam, In Brackets Well then you love CC even more, cos it is Trump

@sameersheikh5301 8 лет назад

Lauryn Sawyer Yay!

@gabrocki 8 лет назад

#MakeChemistryGreatAgain

@momsspaghetti9970 8 лет назад

time for a comeback in my chemistry class. thanks CC!

@kyrakall393 8 лет назад

Saved my midterm tomorrow... Love you VlogBrothers!

@TheGamerUnknown 10 лет назад

I pay attention, and I watch it a few times, but damn i can't get a hang of it. However, this isn't something we cover in AP Chem. Atleast if we do later on in the year, I'll be more prepared. Thanks you. :)

@shengxd9068 8 лет назад

informative video but everything goes too fast

@AlbinosaurusR3X 8 лет назад

+Ce Sheng (Jackson Foo) Yeah, he sounds rushed when this kind of material takes time to process.

@ericabourland1012 8 лет назад

That's why I have to pause and let it sink in before I replay it. :)

@araeside6979 8 лет назад

Just watch it over and over again, write down the key notes and let it sink in.

@mahisolomon8819 8 лет назад

+Ce Sheng (Jackson Foo) you can slow it down by using the setting in toolbar although it might sound weird.

@williscorto4540 8 лет назад

+Ce Sheng (Jackson Foo) You cant expect to fully understand these all in one viewing.. its like being upset that, after your first physics class, your still no Michio Kaku.

@rabbithole797 10 лет назад

Yur, TOTALLY awesome. Do NOT slow down. Let the molasses brain stop the vid as many times as he needs. The rest of us find you to be a breath of fresh air, getting to the point long BEFORE we can even think of falling asleep. Breath of FRESH AIR man. U rock. SUBSCRIBED!! :))

@sportsport1654 4 года назад

You can explain something in 10min something which needs usually a lot of time. I understood thermodynamic laws thanks to you. Which I haven't got for years.

@youvegot 7 лет назад

watching this during the election and laughing at trump

@BlappetureCO 7 лет назад

me hahah

@youvegot 7 лет назад

lmao

@Voyhkah 7 лет назад

well, sorry you-from-two-weeks-ago, but in my time, we've stopped laughing and are curled up whimpering.

@youvegot 7 лет назад

***** I know, I can't believe he made it so far.

@KittySquires 7 лет назад

Sorry you from two days ago...

@SOMEWHATALICE 8 лет назад

watching at 3am and i don't even mind (gcses in a month)

@santiagodaceprano3917 8 лет назад

Same here lol

@zhencongng8064 7 лет назад

you are hardworking

@AJayZy 7 лет назад

Or you know, desperate.

@SOMEWHATALICE 7 лет назад

yeah haha, desperate but it didn't come up

@alexmorehouse9504 8 лет назад

This video was super helpful thanks guys!

@hannahg5407 6 лет назад

Four days before a high school assessment, this is a life saver!!!

@aspenhunter9322 8 лет назад

the little animations are so cute

@2b-coeur 8 лет назад

+Aspen Summer I know right?

@aeroscience9834 8 лет назад

Can you get silver from the silver chloride in the previous video?

@niloygomes3625 8 лет назад

+Aeroscience I'm not sure about this, but electrolysis might work.

@yousufalwaheb8394 8 лет назад

+Aeroscience search for selective precipitation

@ysabelletit 10 лет назад

Woah! I think, this is where my Chem Teacher study her lessons... I should've known, so I didn't have to get through the trouble of keeping myself awake in that time of the day! Plus, this summed up to an hour of our discussion! Thanks Hank, I'll study in advance here.

@joostterhaar7419 8 лет назад

I'm 17 years old and life in the Netherlands, I learned so mutch from this video. I realy want to thank you guys for your video's. Keep up the good work!

@arnav9192 8 лет назад

I know you may not know as much english or they could be typos, but please go through your comment and try to improve ! Always good to learn from mistakes! Really sweet comment though.

@joostterhaar7419 8 лет назад

+Arnav Singh that's the reason why i'm watch these video's i'm realy bad at english but, math, science and chemistry are realy my passion.

@LegoSwordViedos 9 лет назад

Well time to go take my final.

@kylecai2727 10 лет назад

how did i get here from watching "i want it that way" from back street boys....

@Cara.314 10 лет назад

Because RU-vid felt that you had better things to do with your time.

@masgkickmas0n821 5 лет назад

That Tollens reagent reaction was nicely done especially that silver mirror I can’t even get that nice silver coating when I did the experiment

@akshat-kharbanda 7 лет назад

the best crash course till date

@japnoorsandhu6753 7 лет назад

0:44 "Hank is a mass of incandescent gas" 😂😂😂😂 Lmao !!!!

@JerzyCarranza 8 лет назад

Is that Donald Trump at the beggining of the video ?? O_O

@ibadhar7264 8 лет назад

lmao that's what I thought

@ibadhar7264 8 лет назад

lmao that's what I thought

@chowtom5174 8 лет назад

pretty sure it is :D

@anattablue 8 лет назад

this was made in 2013

@benjaminkim2216 7 лет назад

+Stop It Donald trump was still relevant in 2013 just not as much.

@XaurielZ 4 года назад

It made my Canadian soul unreasonably happy to see a loonie being used as your example of a "dollar".

@justinleovao8887 5 лет назад

Im taking AP Chem now and looking back at this, its definitely a refresher :)

@bethli244 10 лет назад

Best way to study for finals

@JohnsCobras 10 лет назад

Too fast... Slow down please.......

@SoraShadowdancer 10 лет назад

But chemistry excites him!

@elsie3916 10 лет назад

Pause button?

@JohnnyDoeDoeDoe 10 лет назад

He prefaces units with saying that if he's too fast you can always rewind, re-watch and even play in slow motion using the options tab.

@SamuelGavin 10 лет назад

Its hilarious to watch him when you change the speed to x0.5.... sounds like he is drunk XD

@Madisyn7 10 лет назад

Predator11563 he would make life easier if he just slows down a tad lol but otherwise hes good :)

@barbellbilly 9 лет назад

CrashCourse your analogies and illustrations have htruly helped a dummy like me who couldn't have learn this stuff otherwise, seriously. Thank you. =]