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
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!
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!!.
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
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.
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!
There is a mistake here , in galvanic cell anode is negative where the electrons are produced from, and cathode is positive. In electrolytic cells, the other way around, cathode is negative and the anode is positive
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.
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 =)
To be honest I'm watching this video because I just got hired as an engineer at a flow cell battery research company and I need a bit of a refresher. So thanks
So I made my own galvanic cell and wanted to see what happened to the current when the molarity of the zinc sulphate was changed. The result was that when the molarity increased, the current decreased. I am unsure why this was the case. Can you please explain it for me? Thank you
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.
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
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.
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.
Isn't the copper half cell the anode as 'the one with the more positive electrode potential becomes the positive terminal' which is the anode and therefore the zinc half cell is the cathode? According to OCR B Salter's A2 revision guide 4:59
At 1:58 I noticed that he said Mn4O2 was Manganese (IV) dioxide when actually that would be MnO2 (the IV refers to the oxidation state of the manganese). Yeah just letting peoples know.
I find it so funny when people try to correct others on things they have no idea about, especially with that kind of language. You'll see just a few seconds later in the video they correct their mistake, showing that Manganese (IV) dioxide is in fact MnO2, not Mn4O2, which would be manganese (I) dioxide. I would suggest next time before you call someone a 'dumb ass' you do some research, or you may find yourself becoming the recipient of your own insult.
ASandwichNinja do research holy duck fuck try and tell me im wrong, you should do your research, if you have Fe2O3 you call it Fe(III)O, im not a fucking idiot you r trying to connect dots that arnt there
I was simply pointing out that your statement insinuating that manganese (IV) dioxide had the same number of manganese atoms as the oxidation of said atoms was completely wrong. Perhaps I didn't make this clear enough for you however I was distracted by the fact that you tried to suggest I was a, as you so gracefully put it, 'dumb ass' while I was just trying to point out a flaw in the video so people wouldn't get too confused. Also, no you would not call Fe2O3 'Fe(III)O', you would call it Iron (III) oxide. If you use chemical symbols, you must specify in what ratio these atoms appear, otherwise what you are writing makes no sense.
don't get me wrong, i really really respect your work and what you are doing. And, i do not believe you meant for it to be insulting (hopefully anyway); but, personally, it still 'strikes a chord' in midst of all this intellectual endeavoring. Yours' truly, Appreciative Subscriber
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!!
There is an error within the equation at 2:16; He says Manganese (IV) Oxide but we see that there is Mg4O2 which is not right because that would mean that compound is not neutral
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.
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 =)
At least by convention, yes. I certainly agree. What Hank has makes sense, but in a different way. I'm not sure what he was going for, but many Chemistry textbooks would disagree with it.
this is enjoyable to watch and its great for identifying what you aren't familiar with for review but I definitely don't recommend this for last minute studies but rather a small partial review after long length studying... that being said there is very little I can say otherwise... if you are taking AP or an exam.... you should most definitely be familiar with the structure of a Galvanic cell, know where the anodes and cathodes are in an equation, and figure out half reactions... much of what is said in this video is extra and shouldn't be taken into account as of "importance". Nonetheless, you cannot go wrong watching this video along with many others as you will indeed always understand Chemistry a great deal more with each reappearance of the subject you wish to learn and/or understand further.
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!
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?"
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.
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.
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
yes he talks fast but this man has done a great job, and if you want to understand him you can just read the subtitles below then pause the video at a time, so that you can get what he is saying. . . this video is so informative, anyway.
It's weird that when you made videos about Thermochemistry I was a junior in high school studying it. Now I'm studying Electrochemistry ._. THANK YOU..
I teach electrochemistry and avoid calling cathode and anode negative or positive, as it is opposite in galvanic and electrolytic cells. What is always correct is that at the cathode, reduction occurs and at the anode oxidation.
Not to be obnoxious - but I think there is an error in the equation at 1:56. It should be "MnO2" not "Mn4O2". The half-reaction at 2:09 is correct, but the overall is wrong. If you try to do the oxidation numbers from the overall reaction you get two oxidations, but using the half-reaction at 2:09 you get the reduction.
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
I failed my exam... but i wouldn't have been able to say I tried my best without you!
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
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?
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!
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!!.
I wish teachers could animate real life like this. it would make things so much easier
Exactly!
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
The point he says "if you were listening...." I break down. Was I really listening?
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.
People: he talks too fast!
Me: watches in 1.5×
I love how he genuinely laughs at his stupidity at 3:03🤣
I'd have prefered more formulae in the crash course...
But yes he speaks at a perfect pace.
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.
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
At 2:49 they have it backwards. Positive is cathode and negative is the anode...
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.
There is a mistake here , in galvanic cell anode is negative where the electrons are produced from, and cathode is positive. In electrolytic cells, the other way around, cathode is negative and the anode is positive
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
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.
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
I have chem quiz tomorrow and i'm watching this instead of studying my note and books lol
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
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).
00:42 and onwards was the most amazing and adorable thing I have ever seen on RUclips.
At least Hank actually takes the time to teach. AP Chemistry would be impossible for me without him!
School : Time for some EXAMS....😈
Crash course : Time to save some life
3:01 When you have an AP chem test tomorrow morning and you're staying up to cram.
Excuse me, I have to pick up the blown off pieces of my head...
I know right?!
Hhahahhahhah
This makes prepping for the MCAT a LOT easier.
love the videos, but at 1:52 the equation has Mn4O2 instead if MnO2, But keep making the videos, i love me some chemistry
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?
dude u make chemistry soooo interesting
To be honest I'm watching this video because I just got hired as an engineer at a flow cell battery research company and I need a bit of a refresher. So thanks
0:41 the chaotic energy of the universe just increased a little more there
Feels like a rite of passage to be reviewing this morning of AP
crash course physics hank!! pleeaassee!
Wow this just summarized everything i’ve been trying to understand the past 2 days😭
These videos are beyond helpful. I really cannot thank you enough for them.
These videos are timeless, and will be forever helpful to struggling ap chem students like me
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
Awesome. Love the Xhibit animation! Epicness.
I have a first year chem exam tomorrow and this is so great! Awesome review tool!
0:42 Unbelievably giddy Hank is unbelievably giddy.
So I made my own galvanic cell and wanted to see what happened to the current when the molarity of the zinc sulphate was changed. The result was that when the molarity increased, the current decreased. I am unsure why this was the case. Can you please explain it for me? Thank you
4:04 salt bridge is used to maintain electrical nuetrality and to make the circuit is closed. Its not function as metal ion carriers.
The quality of the video is outstanding!! Everything is summaries and present in a clear and short way.
do Crash Course Maths, I NEED IT! 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?
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.
Am I the only one that is excited upon every CrashCourse upload?
i might actually pass my midterm now, thanks Hank
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
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.
Have my SAT 2 in chem in two days. Thank god for CrashCourse :)
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.
1:53 should be 2MnO2 ?
Isn't the copper half cell the anode as 'the one with the more positive electrode potential becomes the positive terminal' which is the anode and therefore the zinc half cell is the cathode? According to OCR B Salter's A2 revision guide 4:59
i am just bowing before my computer. i have a massive ap chem test tomorrow and oh my god thank you!!
Being a space science junky, the “electron vacuum” bit was worth its weight in gold in my attempt to understand this.
Is it just me or Hank looks super excited today. ☺️☺️
For people like myself, who hate when people talk slow when explaining things, thank you and salute you. So concise and quick.
At 1:58 I noticed that he said Mn4O2 was Manganese (IV) dioxide when actually that would be MnO2 (the IV refers to the oxidation state of the manganese). Yeah just letting peoples know.
no dumb ass, he is stating the oxidation state, it just so happens that's the same number of atoms
I find it so funny when people try to correct others on things they have no idea about, especially with that kind of language. You'll see just a few seconds later in the video they correct their mistake, showing that Manganese (IV) dioxide is in fact MnO2, not Mn4O2, which would be manganese (I) dioxide. I would suggest next time before you call someone a 'dumb ass' you do some research, or you may find yourself becoming the recipient of your own insult.
ASandwichNinja do research holy duck fuck try and tell me im wrong, you should do your research, if you have Fe2O3 you call it Fe(III)O, im not a fucking idiot you r trying to connect dots that arnt there
I was simply pointing out that your statement insinuating that manganese (IV) dioxide had the same number of manganese atoms as the oxidation of said atoms was completely wrong. Perhaps I didn't make this clear enough for you however I was distracted by the fact that you tried to suggest I was a, as you so gracefully put it, 'dumb ass' while I was just trying to point out a flaw in the video so people wouldn't get too confused. Also, no you would not call Fe2O3 'Fe(III)O', you would call it Iron (III) oxide. If you use chemical symbols, you must specify in what ratio these atoms appear, otherwise what you are writing makes no sense.
Spencer Henchen lolurdumb
Love love love itt....around 30 pages of my textbook in 9 minutes :3
don't get me wrong, i really really respect your work and what you are doing. And, i do not believe you meant for it to be insulting (hopefully anyway); but, personally, it still 'strikes a chord' in midst of all this intellectual endeavoring.
Yours' truly,
Appreciative Subscriber
This is how you sound when you don't put periods in your paragraphs.
when he licked the battery lmao made my day
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!!
yea !!
the review notes at the end were perfect !
i could stop at every note and think back about what the subject was.
What a great way to unite art and sciences, you guys are awesome
There is an error within the equation at 2:16; He says Manganese (IV) Oxide but we see that there is Mg4O2 which is not right because that would mean that compound is not neutral
I applaud anyone who didn't have to consistently positive video to take in every sentence he said
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 =)
At least by convention, yes. I certainly agree. What Hank has makes sense, but in a different way. I'm not sure what he was going for, but many Chemistry textbooks would disagree with it.
I love you, it is so relaxing to watch when you explain stuff!!!
9 years later and hank green still explains really well
this is enjoyable to watch and its great for identifying what you aren't familiar with for review but I definitely don't recommend this for last minute studies but rather a small partial review after long length studying... that being said there is very little I can say otherwise... if you are taking AP or an exam.... you should most definitely be familiar with the structure of a Galvanic cell, know where the anodes and cathodes are in an equation, and figure out half reactions... much of what is said in this video is extra and shouldn't be taken into account as of "importance". Nonetheless, you cannot go wrong watching this video along with many others as you will indeed always understand Chemistry a great deal more with each reappearance of the subject you wish to learn and/or understand further.
Fastest subscribe I have ever give. Less than 15 sec watching the video, I hit subscribe.
Crash course makes me so happy.
Alkaline Battery best DESCRIBED..............LOVE CRASH COURSE
i think youre the next bill nie for anything educational because my teachers are showing you for history
In the Galvanic cell how are the two metals reacting without touching or being in contact when just connected by a wire
IT ALL MAKES SENSE NOW
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 can't believe he really just licked that battery. Science is trully an art.
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!
this video came at perfect timing because this is what we're learning in APChem right now :)
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.
1:55 I don't understand why manganese dioxide has a formula of Mn4O2, I thought it would be MnO2. Can someone please explain?
The annoying moment where my test is always the week before these episodes come out with a way to actually get stuff
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!
Voltage = Popularity... i have very low voltage
Don't worry; my voltage is negative :P
DamnJokster So you're infamous?
Where live u
speaking at a perfect pace gotta say I luv this
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.
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
yes he talks fast but this man has done a great job, and if you want to understand him you can just read the subtitles below then pause the video at a time, so that you can get what he is saying. . . this video is so informative, anyway.
It's weird that when you made videos about Thermochemistry I was a junior in high school studying it. Now I'm studying Electrochemistry ._. THANK YOU..
I have already forgotten nearly everything you have said lol. I think I better start from episode #1. great vid though!
I teach electrochemistry and avoid calling cathode and anode negative or positive, as it is opposite in galvanic and electrolytic cells. What is always correct is that at the cathode, reduction occurs and at the anode oxidation.
Not to be obnoxious - but I think there is an error in the equation at 1:56. It should be "MnO2" not "Mn4O2". The half-reaction at 2:09 is correct, but the overall is wrong. If you try to do the oxidation numbers from the overall reaction you get two oxidations, but using the half-reaction at 2:09 you get the reduction.