Electrochemistry: Crash Course Chemistry #36
HTML-код
- Опубликовано: 25 июн 2024
- Chemistry raised to the power of AWESOME! That's what Hank is talking about today with Electrochemistry. Contained within, Hank discusses electrochemical reactions, half-reactions, how batteries work, galvanic cells, voltage, standard reduction potential, cell potential, electrolysis, electroplating, and the things that go into making it possible for you to watch this episode of Crash Course Chemistry!
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
--
Table of Contents
Electro-Chemical Reactions 0:13
Half Reactions 1:42
How Batteries Work 1:47
Galvanic Cells 3:18
Calculating Voltage 4:12
Standard Reduction Potential 4:42
Standard Cell Potential 6:03
Electrolysis 7:24
Electroplating 7:02
--
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
Instagram - / thecrashcourse
CC Kids: / crashcoursekids
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
Cool!
k
Is this designed for people who have tests in the morning?
+ThisAccountIsNeverUsed that gave me chills :'( in 4 days is my test
actually watching this morning of
Ryan Casey me right now
Next period haha
half an hour here
I failed my exam... but i wouldn't have been able to say I tried my best without you!
Hank saving me from year 12 chemistry >.>
Ikr.
Imagine college 😱
i am. And i bet he is and so are you
I have chemistry and physics-electrochemistry and physics all apart.. lel
PEC is the least thrilling by far lol.
Chem and phys are fun lel
Were you REALLY saved?
The point he says "if you were listening...." I break down. Was I really listening?
I wish teachers could animate real life like this. it would make things so much easier
Exactly!
Hank green!! The best Chemistry teacher ever. I had completely lost interest in chemistry...... But then , here comes Hank Green in crash course chemistry and TADA i love Chemistry again. All thanks to the great Hank Green. I love CrashCourse Chemistry and Vlogbrothers Hank is just too cool!!.
Hi Hank! At 2:10 the 4 subscript is a typo on the Mn for the left side of the reaction; there should be no subscript. ThePlasticModeler pointed this out a month ago, but there's no annotation yet so I'll reiterate it.
I love that you guys go back and correct mistakes with annotations; it gives these videos a peer review and correction process arguably superior to scientific journals!
I'd have prefered more formulae in the crash course...
But yes he speaks at a perfect pace.
I love crash course! If only there were a CRASH COURSE PHYSICS!
Sanjay Gupta WHY DON'T THEY DO THIS?! CrashCourse , PHYSICS MIGHT BE THE MOST DEMANDED SERIES! Please, do this.
John Doe
Thank you. Also, your name matches the default name of the character in games by Kairosoft.
*****
Thank you.
Sanjay Gupta Crash Course Physics is a goal on their patreon www.patreon.com/crashcourse
+Tanishq Desai its just a typical no-identity name hahahahah
although Kairosoft games are good fun.
I love how he genuinely laughs at his stupidity at 3:03🤣
that moment when you don't pay attention in class and came here hoping that maybe you could digest everything in minutes... yeah i'm good, just gon get some tissues and start creating excuses for my failures later
People: he talks too fast!
Me: watches in 1.5×
This is the Chemistry that your teacher wants to teach but can't afford to due to having to adhere to a curriculum. My own class is mostly process, math and rote-learning based, using this "Crash Course" as a way to get a solid CONCEPT based understanding. Chemistry is often very boring material if you look at it in your textbook, but Crash Course makes it come alive.
The effort they put in is clear, and the devotion they have to the subject is real. Don't complain about them for not delving into equations enough: there is too much boring material already out there if you wanted it; read your textbook if you want problems and formulae.
These videos are beyond helpful. I really cannot thank you enough for them.
Crash course is so great - saved my test scores on many occasions! It would be so good if you could do esterification or chemical monitoring - like the Haber process and water quality management, AAS etc! Keep up the amazing work, guys!
00:42 and onwards was the most amazing and adorable thing I have ever seen on RUclips.
This show really helps in my AP Chemistry class!!! Thank you to all who make these shows they help more than you know!!!!
had to drop AP chem.
I didn't watch enough of these videos.
I've watched a lot of crash course, and this is the first time that I need it to actually learn the concepts from class. AWESOME video I must say, very fast but I'll just have to pause it and take notes. Thank you very much Hank and the rest of the Crash Course staff.
Awesome. Love the Xhibit animation! Epicness.
The quality of the video is outstanding!! Everything is summaries and present in a clear and short way.
I love you, it is so relaxing to watch when you explain stuff!!!
Last unit test for my ap chemistry class yesssss i need this class to be over omfg
Same for me! Out last test is electrochem tomorrow
+Sapphire Kawashima Saaame
fml let this class end I have 4 more weeks
is it weird that theres a love and hate relationship for the feel of the class ._. MAY WE SURVIVE MAY 2 #letthecramminggamebegin
BowlOfCuriosity im so stressed for ap tests omggggggggg 5 tests q.q
crash course physics hank!! pleeaassee!
Hank! Love the Crash Course Chemistry series! Please do one for physics it'd be really interesting and I think many people will watch :)
I have a first year chem exam tomorrow and this is so great! Awesome review tool!
I have chem quiz tomorrow and i'm watching this instead of studying my note and books lol
Excuse me, I have to pick up the blown off pieces of my head...
I know right?!
Hhahahhahhah
At 4:00 everything just clicked and there I was screaming because I felt like I finally understood all the knowledge in the universe. Thank you.
dude u make chemistry soooo interesting
School : Time for some EXAMS....😈
Crash course : Time to save some life
What a great way to unite art and sciences, you guys are awesome
These videos are timeless, and will be forever helpful to struggling ap chem students like me
THANK YOU HANK you absolute life saver! :) I have a redox test tomorrow, and I've been so busy with other work, I have had to squash all my revision into one afternoon! This is really great and pretty much summarised the entire IB textbook chapter up in under 10 mins! (the chapter itself took me about an hour and a half to go through)
Although I do have 1 question: how are you supposed to know what is produced at each electrode? e.g. solid metal or chlorine gas or hydrogen etc. How can you tell from an equation if a gas is produced?
Great video, as always. Along with the table of contents and other useful links provided in the video description, the link to your suggested prerequisite video on Redox Reactions would be a nice addition (although it's easily found by going to your channel page).
According to my professor and my college chem book, the outer layer in alkaline batteries is actually zinc, while the inner layer is a paste of KOH with manganese oxide.
lovely representation sir !! i like the way you make the topic simple ,thanks for posting these videos.
I have a test on this on Monday... VIDEO WAS UPLOADED JUST IN TIME
Thank you this was so helpful! not to mention eye opening!
Love love love itt....around 30 pages of my textbook in 9 minutes :3
Wow... lovely! I take electrochemistry this semester and I wanted to see how it is. This condenses pretty much everything xD
In writing the Mn redox reaction (at 2:05) Mn (IV) oxide should be written as MnO2, not Mn4O2 as it's written now. Crash Course, do you do corrections? Sorry if I'm being picky, I love the videos!
+LouisaStar you should be picky.
+LouisaStar Its a test u see
+LouisaStar Literally 3 seconds later they wrote it correctly, so no harm no foul.
+LouisaStar wouldn't it be written as M2O by that logic? Because there is twice as much Manganese as Oxide in M4O2
+Advait Saravade wouldn't it be written as M2O by that logic? Because there is twice as much Manganese as Oxide in M4O2
0:42 Unbelievably giddy Hank is unbelievably giddy.
3:01 When you have an AP chem test tomorrow morning and you're staying up to cram.
At least Hank actually takes the time to teach. AP Chemistry would be impossible for me without him!
yea !!
the review notes at the end were perfect !
i could stop at every note and think back about what the subject was.
hank's getting me through senior chem in 2023 xD
i missed most of my classes on redox reactions and galvanic cells and now i'm doing a whole experiment on galvanic cells because my teacher said that titration's too difficult, kinda forgot that i'd have to study all the theory before i can even start
Error in 1:53... Manganese(IV)oxide is MnO2 like shown in the half reactions, and not Mn4O2 like is shown in initial ecuation.
Alexa Peters Ayeee i was about to comment that. (And speaking of typos, *equation)
Was looking for this comment
Thanks. Excellent !But it would even be nicer if I could find a playlist on the whole serie :)
speaking at a perfect pace gotta say I luv this
WAIT WHAT! 2:06, Mn4O2 is not the same thing as MnO2! There is something seriously wrong here. According to the reaction both Mn4 and Zn are being oxidized which cant be. The MnO2 should be the correct reagent to make sense.
George Hanna At 0:42, we have the cutest Hank green ever!
George Hanna the rxn for MnO2 is wrong! it takes 1 e to give MnO(OH). also many e 0 calculations are wrong but still great explanation
love the videos, but at 1:52 the equation has Mn4O2 instead if MnO2, But keep making the videos, i love me some chemistry
1:53 should be 2MnO2 ?
Yeah keep up the great work! Thanks a ton
Wrong, In batteries only! Positive terminal is called the "Cathode" and the Negative terminal is the "Anode". I repeat Batteries Only.
If by batteries you mean a galvanic cell than yes. In an electrolytic cell the charges of the cathode and anode are switched because current is moving in the opposite direction (like recharging a battery).
Andrew Karpinen so only in batteries is the cathode negative and the anode positive? I was confused because it showed the opposite, thinking; "Isn't the cathode positive and anode is negative?"
Andrew Karpinen You are correct! My textbook says the same!
Oh wait, the diagram at 3:54 shows this, oops
Ruby Chiang Answering your Q. No, A battery ( any typical battery, i.e. NOT a capacitor) chemically able to create a Voltage difference between its internal structures end to end Will provide EMF (Electro Motive Force) in the following path. ( Conventional electron therory always applies during discussion unless specified otherwise.) From the Negative - terminal ( internally ) with the EMF pointing --> + towards the positive terminal. (as im sure we all understand, I'm writing all this for sake of "clarity " here. ) Thus it is opposite any descrete components down the line, as they "Recive" their voltage at there "Anode"
(+) and then deliver from there (-) "Cathode" . Using a Diode example, then power flows to the next component say an Capacitor at it's (+) "Anode". Are you seeing the pattern here? -+-+-+-+ as the Battery is two separate elements to its device. Hence the battery is a "Source" and sources thru it's Cathode out to an Anode in the circuit. You may notice I do NOT mention "Current" or "Charge" here as in general we use that terminology every day and thats ok. But not here because it's im portant to note that a battery does not provide electrons to a circuit. The free electrons used are in the wires and circuit itself. Ions work i side the battery and do work in the cell to provide EMF potential. Same as well for charge. If the last part confused you and made you curious then look up "Coulomb's law" and study and understand charge and you will then understand without question that a battery couldn't even stay together built from the strongest of materials. I hope thks answed your Q.'s simply put A battery ( using a car batt. As a common example) has a Positive (+) terminal that IS a "Cathode" and a Negative (-) terminal IS an "Anode". As I said before. Only, batteries. All other electronic components as usually desribed is true Positive (+) = Anode and the "Cathode" = (-) Negative.
Thank you so much!!! I had a hard time understanding this
Feels like a rite of passage to be reviewing this morning of AP
I love that you uploaded this while my AP chemistry class is taking electrochemistry, haha
when he licked the battery lmao made my day
0:41 the chaotic energy of the universe just increased a little more there
Thank you so much crash course! ❤️
this video came at perfect timing because this is what we're learning in APChem right now :)
Wow this just summarized everything i’ve been trying to understand the past 2 days😭
Wow, we're learning this in chemistry right now!
Well that was extremely helpful, I think I know now some of the inner workings of my pacemaker. Cool. :)
When you labelled the battery where the anode is the positive terminal, and the cathode is the negative terminal, this is backwards to what I have learned. Oxidation, or the loss of electrons happens at the anode, while reduction, or the gain of electrons happens at the cathode. The cathode should be positive in a galvanic cell, or battery, whereas the anode should be negative. In an electrolytic cell they are opposite. In the battery described above, the zinc is oxidized in the anode (or negative terminal), and manganese (iv) oxide is reduced in the cathode (or positive terminal, using a graphite inert electrode). I think this video needs a slight edit to correct this.
This is simple cell where the anode and cathode depend on the electronegativity series
It depends: In a galvaic element the anode is negative but in an elecrolysis an anode is positive. Remember: the rule "ANton the OX is scaRED of the CAT" still counts. (OXidation by the ANode and REDuction by the CATode) if I understand it somewhat correctly that is =)
thanks, explanation of cells was really good. Often people cant explain it properly so I have never fully understood it until now. :)
Being a space science junky, the “electron vacuum” bit was worth its weight in gold in my attempt to understand this.
You did a great job explaining this and I understand all of this so thank you so much 😅😅😅❤❤
9 years later and hank green still explains really well
i might actually pass my midterm now, thanks Hank
I'm pretty sure that in a voltaic/galvanic cell the cathode is positive and the anode is negative. He said the opposite around 2:50? I'm confused does anyone know?
+Ruchi A Well he's right i that in Electrochemistry oxidation the anode and cathode are determined, not by whether the electrode is positive or negative but by where oxidation and reduction occurs, with the oxidizing electrode being the anode and the other the cathode.
It depends: In a galvaic element the anode is negative but in an elecrolysis an anode is positive. Remember: the rule "ANton the OX is scaRED of the CAT" still counts. (OXidation by the ANode and REDuction by the CATode) if I understand it somewhat correctly that is =)
Yes, The negative terminal or electrode where the electrons generates (Anode) and positive terminal where the electron terminates (cathode).
I had to give a test to enter the new school because of your videos i was able to successfuly pass the entry test.
Thanks CC
so helpful thanks hank!
4:04 salt bridge is used to maintain electrical nuetrality and to make the circuit is closed. Its not function as metal ion carriers.
Is it just me or Hank looks super excited today. ☺️☺️
I truly thank you for saving my academic life.
Lydia Hayward you're beautiful
hi
Why do everyone want to let her to like you guys...the more u guys say the less chance she likes you it’s just feels...............weird?
Really thanks guys
This makes prepping for the MCAT a LOT easier.
thank you smmm this is great thanks a lot!!
love u man, thank u so much, u saved me today:)
Happy teachers day Hank...You're like super awesome..!!
as·pect ra·tio
noun
1. The ratio of two dimensions of something as considered from a specific direction, in particular.
2. Rhe dimensions of a display resolution. For example, a resolution of 800x600 has an aspect ratio of 4:3.
IT ALL MAKES SENSE NOW
Writing CAPE Chemistry tomorrow, this is going to save my life lol (Caribbean Advanced Proficiency Examinations)
Same
same
Yo ho, yo ho aChemist’s life for me?
Crash course makes me so happy.
In an electrolytic cell, the anode is positive while the cathode is negative. You might want to specify that since many people may become confused. In a Galvanic cell, the anode is negative and the cathode is positive.
I have already forgotten nearly everything you have said lol. I think I better start from episode #1. great vid though!
I could've used this yesterday while studying for the chemistry exam I had today
Voltage = Popularity... i have very low voltage
Don't worry; my voltage is negative :P
DamnJokster So you're infamous?
Where live u
Have my SAT 2 in chem in two days. Thank god for CrashCourse :)
Thumbs up for all the effort!
Can you do a crash course on nomenclature! It's the most difficult thing i've ever learned, and i'm not really grasping it, and your videos usually help. Please and thank you! :-)
Great video!
Love your videos I hop this get up
And yet you surpass the quality of your videos. Thanks for being awesome :)
Never understood chemistry.Actually hated it.After watching this video I understood things which my teachers were never able to make me understand all those years.I have become a fan of chemistry.Respect to you and chemistry!!
Am I the only one that is excited upon every CrashCourse upload?
It will continue to frustrate me that my teachers dont even try to make chemistry interesting.. When i watch this i get super excited but the thought of chemclass gives me chills
YOU SAVED ME GOD BLESS U
Chemistry raised to the power of awesome.
That's what I think of all your crash courses, Hank! THNX!