Redox Reactions: Crash Course Chemistry #10

[@crashcourse]

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

[@lereverse1998]

Stfu

[@Inbbnbb]

Ok hank and co

[@trevorlei4096]

@@lereverse1998 chill out chelly

[@lereverse1998]

@@trevorlei4096 haha

[@RhyminCarly]

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.

[@AGLaconic]

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

[@firecollection]

+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]

+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]

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]

+

[@megangilmore9355]

+

[@TheNextNotch]

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

[@kobewankenobi8926]

His name is Hank Green

[@leodaza3]

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

[@wewemcrhyne]

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

[@lereverse1998]

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

[@TheNextNotch]

@@lereverse1998 I'd still hug him

[@ohheycrystalhey]

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]

Turn on CC

[@blackphoenix251]

did this lesson become useful to you after 5 years?

[@nicholasdsilva1832]

amen

[@carrie-annethomas2778]

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

[@disconsolate3235]

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

[@aryotaheri7421]

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

[@mayahattangdi3270]

hahahah yessss

[@marweeo]

well i learned something today

[@washington0005]

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

[@israelhernandez53]

omg yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeessssssssssssssssssssssssssssssssssss

[@designholicmuaz7780]

This comment made more people laugh than KSI

[@letsseepaulallenscard.6604]

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

[@mkshnv7085]

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

[@meganpennington343]

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]

lol did anyone die

[@andrewminczeski8528]

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

[@loganscully373]

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

[@nathanyein]

@@loganscully373that's sarcasm right?

[@loganscully373]

Nathan Yein nope

[@alanamesko8717]

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

[@m35926]

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

[@cookiecookie8581]

I thought i was the only one felt that way lol

[@justice_edits]

@@cookiecookie8581 me too

[@lukestevens6114]

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

[@LO-qs3sp]

It's rewind time.

[@eviolinarts5014]

Welcome to inattentive type adhd 😔

[@GamePhysics]

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

[@samymucho5494]

Same...

[@GamePhysics]

samy mucho I passed! :D

[@BlackIsOut]

lol

[@roooose16]

+GamePhysics wow, so much for that.

[@imamongthem3422]

i failed

[@crazydang101]

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.

[@aasthasharma3820]

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]

Same

[@madLphnt]

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]

ok:)

[@varunSharmakvboss]

SAME HERE

[@aasthasharma3820]

well i guess it's actually more like 5 minutes

[@Rin-qj7zt]

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

[@22Tech]

+Wulframm Rolf thanks fam

[@jasonslade6259]

+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]

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

[@rayz0rxxx]

it is really confusing for us new learners so yeah.

[@sxge4751]

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

[@santelmo5222]

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

[@zoejacques3716]

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

[@theoreticalphysics3644]

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

[@honavaioleti8663]

@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]

It is not that hard once you get used to it

[@adityaroy9117]

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

[@danielward9376]

Yes if a classroom teacher taught like this it wouldn't be good but it's KZbin. 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]

Exactly my thoughts.

[@abigailplylar5433]

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]

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]

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

[@itsobvious42]

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!!!!

[@RachelHom]

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

[@okiedokie9557]

+Rachel Hom I really like that!

[@SophiaSu52]

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

[@coolbeatguy]

Thx I really needed that!

[@chancepark6253]

also reduction REDUCES charge

[@xAneesaxful]

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

[@najeebal-shabibi9394]

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

[@danishstrikes]

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

[@juliapelech4094]

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

[@maliciousmarka]

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.

[@InnerSunshine]

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.

[@ronschlatter822]

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.

[@prestonwood3561]

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

[@hicketre2006]

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.

[@jordanorsak938]

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

[@LoLIHateMyNameLoL]

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

[@YungFudd1776]

Z Adel NO ☭!

[@jetkwan2935]

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

[@shaimamiah]

i agree

[@toshido_yamada]

good bye cruel world

[@haditmarquez4940]

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

[@ZiggyGreen123]

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.

[@bigmaninthepants]

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".

[@emmazhang1451]

To all those people who think he is talking too fast. It is a KZbin video! You have the freedom to pause it for time to think, rewind it if you don't get something, or watch it again and again if you have to. Hank is trying to cover a lot of material in one video hence the name "crashcourse". I really appreciate Hank putting it into a short concise video and if you don't get it you can always watch it again!

[@XaurielZ]

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

[@FastestCrafter]

Crash course; bashing trump since 2013

[@aasthasharma3820]

Haha

[@DudeWhoSaysDeez]

heh

[@SS-hv5sy]

i thought they showing that he is a rich guy

[@kateorourke6064]

M1FF3D we stan

[@benjiwyatt8812]

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.

[@lynxdre]

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]

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

[@davidbliss8352]

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

[@charlottekraft2657]

Haha this sums up my situation lol

[@kumarichhetri7982]

Same here😣

[@div_yam2304]

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

[@SarahSkye14]

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.

[@chocolatedream0612]

I agree with people who believe that Hank is speaking too quickly in his videos, therefore making it hard to grasp information (especially if you're LEARNING the material, instead of revising it). This problem can be solved by clicking at the end of the link of the video and manually typing in 'slow' (it works for me). Anyhow, I am still grateful that CC had made these videos easily accessible and available for free. Thank you CrashCourse!

[@nikkilabuckauful]

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]

The electrons are from The hydrogen

[@MissyS1614]

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

[@Jumpingoutoftrees]

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.

[@joostterhaar7419]

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]

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]

+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.

[@kevinharris6650]

My graduate level professor linked us to this video for class. the course is intro to environmental systems and the professor knows most of us have not had chem in forever. great video.

[@mariahmolina2527]

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

[@mathewmjohn7322]

mariah molina Check out Exam Fear.

[@mathewmjohn7322]

Krishna Narayanan Yeah! And you?

[@PrincessTanyaBarbie]

+Krishna Narayanan Indians unite xD

[@mathewmjohn7322]

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]

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

[@johnhilbert7640]

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

[@joshuawalker5825]

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]

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]

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

[@alexpeterson3200]

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]

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

[@lindseyvalancius7690]

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

[@swampertblaziken1]

To anyone complaining that the talking's too fast, remember that it is just a crash course, and since this is a video, we're welcome to rewind to whenever we want to be. In a typical CrashCourse video, I rewind around 30-40 times within the whole vid just to make sure that I absorb what he wants to say. You are not expected to get all of the lessons from the video in one sitting. Have patience, guys!

[@amandawilliams7488]

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

[@radhikasewram2316]

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 ;)

[@stephclark9308]

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

[@Benraimundo]

howd you go?

[@JimNagle87]

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

[@rabbithole797]

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!! :))

[@almaszaveria5006]

Thank you so much for this, lots of love from 🇮🇳 India

[@27Nichy]

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]

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

[@InterrobangActivate]

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

[@rogerdotlee]

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]

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]

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]

I think it is pretty normal o.o

[@jcmorales1564]

Halogens have a very high ionization energy (not low, as written on the periodic table at 4:54). Only the noble gases have higher ionization energies. Ionization energy is the amount of energy required to remove an electron from an atom. So, it is very difficult to remove electrons from the halogens, and even more so from the noble gases. In contrast, the alkalis have very low ionization energies. Great video! Thank you!

[@donmckechnie9858]

An interesting Crash Course topic might be the burning of gasoline and the mass or (especially) the weight of the combustion products, CO2 and water.

[@einavguetta3500]

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

[@meltdown6856]

Here’s a good way of remembering why reduction is called “reduction”. Electrons are negatively charged, so a “gain” in electron caused a “reduction” in charge. Like if Sodium cation (+1) charge recieves an electron, it become Na(0 charge), so it’s charge reduces

[@kuhhchow]

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

[@Rmcclure584]

We dont use 'OILRIG' we use 'LEO the lion says GER'. LEO = Loses Electrons/Oxidizes and GER = Gains Electrons/Reduces. But thank you anyway for this tutorial Hank :) I just want to say that I watched some of the biology videos last night, and ONE OF THE THINGS IN THE VIDEO THAT WE WERENT TAUGHT CAME UP IN THE EXAM AND SO THANKS TO YOU I KNEW WHAT THE ANSWER WAS. You guys are my heros :) DFTBA

[@sportsport1654]

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.

[@CB-sk1pq]

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

[@rockingupthewrongtre]

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

[@zippyman28]

Simple yet thorough.

[@peteriyida4485]

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

[@smailedog657]

Alternate mnemonic: LEO the lion goes GER. Losing Electrons is Oxidation. Gaining Electrons is Reduction

[@japnoorsandhu6753]

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

[@lindsaymargaret1508]

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

[@MichelCarroll]

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

[@robertjervis7443]

I would simply like to state that his speed and teaching is amazing for people who are currently or, even better, have already studied these topics. I noticed a LOT of people complain about his speed which is very justified(he does speak really fast) but I have also noticed a lot of people complaining that he isn't great at teaching where in fact it is a crash course im going to assume intended for people trying to get better (meaning you've already studied these topics) or, like me, people who are trying to get a re-fresh for university but not really the best thing for people trying to learn from scratch. BUT that's just my opinion.

[@steadycheckmate]

After hearing you speak every sentence, I felt like taking a DEEP breath -- you spoke really, really fast. Good video though!

[@catalyst-sai5180]

I am class 11 and it is 10pm having exam tmrw at 8am thanks i feel i understood but still fell empty thanks i understood something good than wasting

[@sameersheikh5301]

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

[@Giacomino_]

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

[@sameersheikh5301]

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

[@rynsawyer4185]

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

[@sameersheikh5301]

Lauryn Sawyer Yay!

[@gabrocki]

#MakeChemistryGreatAgain

[@christopherrobinson193]

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]

Right!

[@alvinmoore308]

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.

[@cr9ngey925]

wow i am new and also dont know who name is that guy but his good at math and science 😮i impressed MIND BLOWN 😮🌡🌡💣💣💣

[@ivelsoup]

I like to think of it as a runner: If you remove some of the load (Oxidation) he can run faster and has more “charge.” But if you add more to the load he is weighted down, and therefore has reduced energy and is “negatively charged”. This has helped me, it is nice to visualize it. You could add to it, or do whatever you want to the analogy: Both runners want to share the weight with each other, because they understand that will make it easier.

[@youvegot]

watching this during the election and laughing at trump

[@BlappetureCO]

me hahah

[@youvegot]

lmao

[@Voyhkah]

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

[@youvegot]

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

[@KittySquires]

Sorry you from two days ago...

[@JohnsCobras]

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

[@SoraShadowdancer]

But chemistry excites him!

[@elsie3916]

Pause button?

[@JohnnyDoeDoeDoe]

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]

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

[@Madisyn7]

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

[@jaybestemployee]

Here's my honest advice to the host. There are 2 cases I consider the quality of this series. When I am already familiar with the topic/concept, I feel the host is just telling bad jokes about it. When I am NOT familiar with the topic, what the host said didn't make it easier to understand. It seems the host is not trying to make people understand new things but just to let them hear you skim through all those keywords that can't be understood without prior knowledge, with occasional bad jokes in between. I know there may be a lot of material to cover, but if you're going to make a useful video, either 1. tell better jokes with news/updated knowledge about the topic that those who already know chemistry would have missed because they are not up to date with news in the field; or 2. really patiently explain the concept in simple understandable well-paced language and well-explained examples like Phil Plait, another host of CrashCourse, did in his own field.

[@hannahg5407]

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

[@nardo7817]

Reduction is called "reduction", not because of the change in electrons, but rather in the oxidation number. When an atom is reduced, so does the oxidation number. Can't say for sure about "oxidation" though.

[@shengxd9068]

informative video but everything goes too fast

[@AlbinosaurusR3X]

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

[@Novjuly]

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

[@araeside6979]

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

[@mahisolomon8819]

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

[@williscorto4540]

+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.

[@JerzyCarranza]

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

[@ibadhar7264]

lmao that's what I thought

[@ibadhar7264]

lmao that's what I thought

[@chowtom5174]

pretty sure it is :D

[@anattablue]

this was made in 2013

[@benjaminkim2216]

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

[@joshsoolee]

is that Donald Trump swimming in a pile of gold coins at the start?

[@johng.8626]

Watching these to pass time and gain knowledge of chemistry. I don't ever plan on being a chemist so I get a bit glossy eyed when he starts doing the math part of it. I don't envy anyone trying to learn how to calculate these reactions by watching this video.

[@OnTheHorizonMC]

In my class, we use " *LEO* the lion goes *GER*" (cuz our school mascot is a lion). *LEO*: Losing Electrons, Oxidation *GER*: Gaining Electrons, Reduction Idk, it helps me remember the oxidizing agents and reducing agents better. *OIL* *RIG* is good too though.

[@aspenhunter9322]

the little animations are so cute

[@2b-coeur]

+Aspen Summer I know right?

[@mikkicarr5717]

Third grade algebra? Who learns algebra in third grade? When I was in grade 3 we were just learning how to multiply!

[@SOMEWHATALICE]

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

[@santiagodaceprano3917]

Same here lol

[@zhencongng8064]

you are hardworking

[@AJayZy]

Or you know, desperate.

[@SOMEWHATALICE]

yeah haha, desperate but it didn't come up

[@boringlikeme]

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

[@akshat-kharbanda]

the best crash course till date

[@rafaelximenes6550]

Oxygen can have a positive charge, when it's bonded with fluorine, because this last is more electronegative.

[@TheGamerUnknown]

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. :)

[@kylecai2727]

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

[@Cara.314]

Because KZbin felt that you had better things to do with your time.

[@cristianodionizio521]

At 7:48 isn't it +6 electrons instead of +3 because you have oxidation state of negative 3 on one Nitrogen and you have 2Nitrogen, same thing after for the Hidrogen?

[@alysonwells1486]

I love these videos because I can never understand what my bio 1 professor is talking about....so then I come here for when I am studying for my test!

[@TonboIV]

The Trump animations are suddenly much less funny.

[@SS-hv5sy]

why

[@dainironfoot5198]

@@SS-hv5sy Have you been living under a rock?

[@SS-hv5sy]

@@dainironfoot5198 he got rich so what if he is president .

[@TonboIV]

@@SS-hv5sy I suppose the situation looks a little different if you're a neo-nazi. You even have SS runes for your AV.

[@PengyDraws]

@@TonboIV you, assuming only white nationalists support trump: half of america: kek

[@aeroscience9834]

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

[@niloygomes3625]

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

[@yousufalwaheb8394]

+Aeroscience search for selective precipitation

[@ilomaster6]

for someone who's new with redox-reactions,its gonna be difficult to follow cause he's going TO FAST en he talks a lot whats irrelevant with the subject. And showing the reactions weren't so good he made it like puzzle. now for someone who's new with the redoxreactions ,and you make it like a puzzle,well lemme tell you this HE WONT BE ABLE TO FOLLOW. the video is good but you should make it more easier to follow :)

[@aditya322]

Tiny error in the video. At about 9:40 it's the Ag as part of silver diamine which has an Oxidation State of +1 and not the elemental silver . Fantastic stuff btw. Great recap material. Hats off to you guys.