Redox Reactions: Crash Course Chemistry #10
ฝัง
- เผยแพร่เมื่อ 21 เม.ย. 2013
- 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!
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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
Stfu
Ok hank and co
@@chellyreverse2235 chill out chelly
@@trevorlei4096 haha
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.
lol did anyone die
As a chemistry teacher, why did your chemistry teacher give you hydrochloric acid on your first day of chemistry?
@@andrewminczeski8528 its just hydrochloric acid, I've been getting it since I was like 12
@@loganscully373that's sarcasm right?
Nathan Yein nope
I wish teachers were more specific in why things are actually happening instead of "thats just the way it is"
+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.
+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.
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.
+
+
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!
Turn on CC
did this lesson become useful to you after 5 years?
amen
@Goncalo Oliveira Since there's almost 400 likes on that comment, I'm gonna guess she's not the only one. xP
@Goncalo Oliveira why would they bother commenting when liking the comment means they agree with it already?
I don't know who this guy is, but I will find him and i will hug him.
His name is Hank Green
if you like this, you'll like his other channels too! :P
I think he’s saying “who’s Hank?” As is asked on all of John Green Vlogbrother videos!!!
I'm writing this comment so u try and remember when u wrote this and how uve changed
@@chellyreverse2235 I'd still hug him
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.
at least i know now that a Portmanteau is a large suitcase
Porte-manteau is a coat rack and suitcase would be translated as "valise" I guess
reduction is totally a name that makes sense. if you gain electrons, the charge has been reduced....
+Wulframm Rolf thanks fam
+Wulframm Rolf Only because somebody arbitrarily decided that Electrons would be negative and protons positive. So I guess it works out by complete chance.
Jason Slade
that's my point tho. it was supposed to be slightly humorous. twas poorly written tho
it is really confusing for us new learners so yeah.
I’m a new learner, you opened up my eyes
I swear this video has saved more lives than the Haber process. Thank you Hank
hahahah yessss
well i learned something today
aryo borzin Taheri this video also killed more people's dreams than the Haber process... they thought they knew chem
omg yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeessssssssssssssssssssssssssssssssssss
This comment made more people laugh than KSI
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
after 5 minutes all I hear is 'blah blah blah'. time to rewind
I thought i was the only one felt that way lol
@@cookiecookie8581 me too
Because this is a rubbish video.. don’t bother rewinding go watch Tyler Dewitt’s videos on redox reactions
It's rewind time.
Welcome to inattentive type adhd 😔
Yeah... I'm failing this exam. Thanks for telling me, crash course.
Same...
samy mucho I passed! :D
lol
+GamePhysics wow, so much for that.
i failed
Difficulty level 1000000: increase the speed of the video to 1.5.
OMG I tried it and you're right it's hard
oh ive been doing that the entire time... granted that this is just review bc ive got finals tomorrow
@the lost star warrior Same. If you can get used to him speaking at that speed, then regular speed sounds normal (maybe even slower)
It is not that hard once you get used to it
@@zoejacques3716 Well I have a test tomorrow and I'm watch at 1.75X.
Yes if a classroom teacher taught like this it wouldn't be good but it's TH-cam. 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
Exactly my thoughts.
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.
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
@@abigailplylar5433 because people don't understand and start complaining
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
Same
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
ok:)
SAME HERE
well i guess it's actually more like 5 minutes
You can also think of it as LEO the lion saying "GER" (grrrr).
Losing
Electrons
Oxidation
Gaining
Electrons
Reduction
Thx I really needed that!
also reduction REDUCES charge
We use OIL RIG in Scotland haha :
Oxidation is Loss
Reduction is Gain.
Aneesa A also in Britain, I guess the education is very similar
Najeeb al-shabibi I live in texas and we also do OIL RIG :D
Just remember kids, LEO (loses electrons, oxidation) the lion says GER (gains electrons, reduction)
+Rachel Hom I really like that!
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.
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.
All I hear is blah blah blah electrons blah blah 😩 definitely failing this test 😭
mariah molina Check out Exam Fear.
Krishna Narayanan Yeah! And you?
+Krishna Narayanan Indians unite xD
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.
Krishna Narayanan And yeah, John and Mathew are common names among Malayalees or Malayalis , whatever.
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.
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!!!!
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
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.
Let's all just give up to life and become non-productive members of society.
Z Adel NO ☭!
Let's just kill ourselves so we don't become a burden to society
i agree
good bye cruel world
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.
"AnD tHoSe ArE aLl ThE rUlEs" sir i need to remember all of these by tomorrow!! }:(
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.
The electrons are from
The hydrogen
Thanks really helpful, I never really got this in class. I do feel that Crash course could do with some examples or questions. :)
Simple yet thorough.
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.
this man has single handedly saved my grade in so many different classes over the years i cannot thank you enough hank
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
+Lynxlynxlynx Jay
Try Khan Academy. They do an excellent job of going more in-depth and also showing example problems.
+KR Lormand, Thank you. This tip was extremely helpful.
Haha this sums up my situation lol
Same here😣
This is a CRASH COURSE dude, its meant to be studied much before the exam.
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.
This actually helped me quite a lot with understanding how redox works, thanks.
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.
Crash course; bashing trump since 2013
Haha
heh
i thought they showing that he is a rich guy
M1FF3D we stan
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.
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.
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.
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.
I think it is pretty normal o.o
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
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
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!
I read "my Chemical principles" as "My Chemical Romance" oh no
This was incredibly entertaining! Thought my review on redox reactions would be dull.
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".
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.
At 10:04 you could see the crash course room from the reflection...
New goal in life: use the word portmanteau in a conversation.
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.
The Crash Course Series have helped me ace a couple college classes. Thank you!
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
howd you go?
Leora = Lose Electron Oxidation Reducing-Agent
Geroa = Gain Electron Reduction Oxidizing-Agent
*thumbs up :)
You're fantastic. If you were a professor at my college, i'd take your class in a heart beat.
thank you so much! this video is a bit fast, but it really helped me understand wtf is going on in redox reactions
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
Crash course is a gift for students with teachers who don't give a fuck
Thank you so much. This is helping a lot. :) My professor teaches too fast sometimes, but at least here I can press pause.
I am very thankful for how helpful these are, thank you
Thumbs up if you love the way he says "Noo!" at 5:35
Ok I give up. Chemistry is just too complicated. I'm coming back to math.
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 :)
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
aaaaaand this is why I wonder why I even bothered to take summer chemistry.
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
i know how you feel. i have to watch these videos several times; I'll often replay the same two minutes over and over.
lovely video. the visual representations were amazing and so easy to follow
Im taking AP Chem now and looking back at this, its definitely a refresher :)
can i get answers for those questions?
• Which small particles are the main players in chemical reactions?
NOT IN VIDEO: Not all of them are, are they? Which are?• What does „Redox“ stand for?
• Why is „reduction“ a terrible choice leading to many wrong answers in science tests?
• What happens during oxidation?
• Give 3 examples for redox-reactions.
• NOT IN VIDEO: In ionic bonds and metal bonds it is easy to assign electrons to the atoms. Why?
• In kovalent bonds it‘s not that easy. Why?
• What is described by the oxidation state/number?
• What are the 5 rules for Oxidation numbers?
• But what is the oxidation state of the whole molecule?
• What happens to the oxidation states of atoms during redox-reactions? in other words, when do we describe a reaction as redox-reaction?
• What happens in the Haber-process? Why do you think he mentioned it as one of the most important chemical reactions ever invented?
Wäre zu einfach... 😂😂
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 ;)
time for a comeback in my chemistry class. thanks CC!
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
you explained this better in 10 mins than my college professor did in an hour.... thanks for saving a life
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. :)
This is a live saver thank you very much I have learned a lot
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.
informative video but everything goes too fast
+Ce Sheng (Jackson Foo) Yeah, he sounds rushed when this kind of material takes time to process.
That's why I have to pause and let it sink in before I replay it. :)
Just watch it over and over again, write down the key notes and let it sink in.
+Ce Sheng (Jackson Foo) you can slow it down by using the setting in toolbar although it might sound weird.
+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.
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
Right!
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.
Bro, your videos are rad and your community crash course is a beast
Thank you so much you're videos are always super helpful and funny.
i always used to think chemistry wasnt that hard... but this is seriously making my brain hurt :/
Oxygen can have a positive charge, when it's bonded with fluorine, because this last is more electronegative.
I also learned what a portmanteau is. Thank you.
Thanks for a refresher. Definitely helped me out :)
trump before he is a meme
He still is.
I believe they mean that CC Chem is joking about Trump before the time in which he was a meme.
Do you mean before he is president?
watching this during the election and laughing at trump
me hahah
lmao
well, sorry you-from-two-weeks-ago, but in my time, we've stopped laughing and are curled up whimpering.
*****
I know, I can't believe he made it so far.
Sorry you from two days ago...
Wow, I love you.
Love your humor.
Thank you.
Too fast... Slow down please.......
But chemistry excites him!
Pause button?
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.
Its hilarious to watch him when you change the speed to x0.5.... sounds like he is drunk XD
Predator11563 he would make life easier if he just slows down a tad lol but otherwise hes good :)
Well time to go take my final.
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!
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.
+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.
Did the calculations on my dry erase board. It helped a lot.
the little animations are so cute
+Aspen Summer I know right?
0:44 "Hank is a mass of incandescent gas" 😂😂😂😂 Lmao !!!!
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.
I watched this video a few years ago and didn't understand ANY of the topics mentioned. BUT, it was much appreciated when I started chem 2. So thank you... I guess
Can you get silver from the silver chloride in the previous video?
+Aeroscience I'm not sure about this, but electrolysis might work.
+Aeroscience search for selective precipitation
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 :)
thank you thease vids have helped me so much!!! x
the best crash course till date
and this is where I give up on chemistry again :(
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.
Your videos are amazing! Keep doing what you're doing and thank you so much! :)
CrashCourse your analogies and illustrations have htruly helped a dummy like me who couldn't have learn this stuff otherwise, seriously. Thank you. =]
Is the guy at 0:07 Donald Trump? If so, then I love CrashCourse even more now.
+Golam, In Brackets Yep, that's definitly Trump.
Matthew Miller Awesome! I love how they did his hair.
+Golam, In Brackets Well then you love CC even more, cos it is Trump
Lauryn Sawyer Yay!
#MakeChemistryGreatAgain
watching at 3am and i don't even mind (gcses in a month)
Same here lol
you are hardworking
Or you know, desperate.
yeah haha, desperate but it didn't come up
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!
thank you this video has saved me for down the road...i wish i found this before my exam yesterday...
great animation and topic thanks! (I suggest a slower rhythm instead of a constant speech which is tiresome, you would show more by merely focusing on the main points and alternating silence/music with talk).
Guillaume Combot You can slow it down if you are on desktop. :)