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!!.
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.
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
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
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!
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.
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 =)
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
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
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.
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 =)
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!!
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
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.
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.
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 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.
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
How batteries work has always been a mystery to me, despite taking high school and college chemistry classes. This is the third time I've watched this episode, and I think I might be starting to get it. Let's see if I understand. The copper and zinc react with their solution, forming copper and zinc ions. These ions then react with each other, while the electrons form a current in the conductor. Have I got it right?
hmm, ish. The copper and zinc ions don't react With each other directly. Sulfate ions moves through the salt bridge and Electrons move the opposite way through the conductor
Okay, so it's a system of reactions, where everything reacts with what is next to it, the sulfate ions are conducted through the salt bridge, and the electrons are conducted through the metal.
yes, and the Whole thing happens because one side is more reactive than the other. Ideally both the copper and zinc would like to be in an ionic state (so it has a full Electron Shell), but because zinc is more reactive than the copper, zinc will basically force feed the copper With it's excess Electron (Zn (s) --> Zn2+ + 2e-) So if you were to measure the zinc metal you would see that it loses weight, because Zn atoms are moving from its pure state to the ionic state in the ZnSO4 solution. You now have free floating Zn2+ ions in that solution. The excess Electrons will then move through the electrodes and the conductors to the other side. The copper sulfate solution (CuSO4) These excess Electrons gets picked up by the Cu2+ ions in the solution and more solid copper is formed (the copper electrode gains mass/weight) As the CuSO4 solution loses copper ions, there will be free SO4 2- ions floating about. These moves through the salt bridge and reacts with the free floating excess Zn2+ ions in the zinc sulfate solution. So bottom line, the zinc metal turns into zinc ions in a solution, the copper ions in the other solution turns into copper metal. (Zinc electrode loses mass, copper electrode gains mass) I hope this was clear to you :) -Sincerely Norwegian Chemistry and Biology student :)
Thanks. I have always found it strange that I can master quantum physics and general relativity at the graduate level, but freshman chemistry is still hard for me.
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!
Around 1:55. I see a small error in the explanation of the half-reaction. Manganese(IV) Oxide is erroneously labeled Mn4O2 instead of MnO2. It is later corrected.
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.
If you google "alkaline cell" and take a look at any diagram, the cathodic plate is always the top and the anodic plate the bottom. Perhaps this is just due a discrepancy in conventional current vs flow of electrons as you said?
this was put together very well... this also reminded me how I hated the chemistry lingo.. oxidation is loosing elections but not be confused with reduction which is gaining but however the reducing agent is.... general chemistry wasn't one of my most enjoyable classes. to anyone that plans on taking it, I would recommend taking higher level physics and math first if possible. i see a lot of people get discourage from this course that have a lot of potential.
I work for a company that does pretty large scale electroplating and they use Lead anodes in the Chrome tanks. I dont know if that is industry wide but just what we do. FYI.
It's confusing but. . . Electron flow is from Cathode(Negative) to Anode(Positive). What we measure in electricity is not the flow of the electrons exactly, but rather the flow of positive charge from Anode to Cathode.
lions growl, LEO goes GER (losing electrons: oxidation) (gain electrons: reduction) but it gets confusing because the reducing agent is the opposite from that which is reduced etc
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
The function of the salt bridge is inaccurately described. The metal ions do not travel through the salt bridge from half-cell to half-cell. Ions from the salt bridge enter the solution to neutralize the charge. For example, in the Zn half-cell (anode) the negative ion is released from the salt bridge in solution to account for the addition of Zn2+ in solution (as Zn atoms lose electrons to the wire they dissolve into solution). The opposite occurs for the cathode solution.
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?
Doesn't a negative sign on Gibbs Free Energy indicate that the forward reaction is spontaneous? Because that means that the system is losing or giving off energy, so it would make sense that no energy is required from an external source to make that happen.
DRAM memory is composed by capacitors and they are small electric storage units(at least at chip level), probably your teacher was referring to that kind of storage but that's my opinion...
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..
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?
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!
The point he says "if you were listening...." I break down. Was I really listening?
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.
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
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🤣
People: he talks too fast!
Me: watches in 1.5×
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.
00:42 and onwards was the most amazing and adorable thing I have ever seen on UA-cam.
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
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
At least Hank actually takes the time to teach. AP Chemistry would be impossible for me without him!
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 makes prepping for the MCAT a LOT easier.
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...
Feels like a rite of passage to be reviewing this morning of AP
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.
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
dude u make chemistry soooo interesting
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).
The quality of the video is outstanding!! Everything is summaries and present in a clear and short way.
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.
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 have a first year chem exam tomorrow and this is so great! Awesome review tool!
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.
These videos are timeless, and will be forever helpful to struggling ap chem students like me
Excuse me, I have to pick up the blown off pieces of my head...
I know right?!
Hhahahhahhah
I have chem quiz tomorrow and i'm watching this instead of studying my note and books lol
4:04 salt bridge is used to maintain electrical nuetrality and to make the circuit is closed. Its not function as metal ion carriers.
crash course physics hank!! pleeaassee!
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
Awesome. Love the Xhibit animation! Epicness.
0:41 the chaotic energy of the universe just increased a little more there
These videos are beyond helpful. I really cannot thank you enough for them.
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
1:53 should be 2MnO2 ?
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?
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.
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 =)
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
Wow this just summarized everything i’ve been trying to understand the past 2 days😭
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.
In the Galvanic cell how are the two metals reacting without touching or being in contact when just connected by a wire
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
0:42 Unbelievably giddy Hank is unbelievably giddy.
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.
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.
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 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 am just bowing before my computer. i have a massive ap chem test tomorrow and oh my god thank you!!
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
What a great way to unite art and sciences, you guys are awesome
Am I the only one that is excited upon every CrashCourse upload?
How batteries work has always been a mystery to me, despite taking high school and college chemistry classes. This is the third time I've watched this episode, and I think I might be starting to get it. Let's see if I understand. The copper and zinc react with their solution, forming copper and zinc ions. These ions then react with each other, while the electrons form a current in the conductor. Have I got it right?
hmm, ish. The copper and zinc ions don't react With each other directly. Sulfate ions moves through the salt bridge and Electrons move the opposite way through the conductor
Okay, so it's a system of reactions, where everything reacts with what is next to it, the sulfate ions are conducted through the salt bridge, and the electrons are conducted through the metal.
yes, and the Whole thing happens because one side is more reactive than the other. Ideally both the copper and zinc would like to be in an ionic state (so it has a full Electron Shell), but because zinc is more reactive than the copper, zinc will basically force feed the copper With it's excess Electron (Zn (s) --> Zn2+ + 2e-) So if you were to measure the zinc metal you would see that it loses weight, because Zn atoms are moving from its pure state to the ionic state in the ZnSO4 solution. You now have free floating Zn2+ ions in that solution. The excess Electrons will then move through the electrodes and the conductors to the other side. The copper sulfate solution (CuSO4) These excess Electrons gets picked up by the Cu2+ ions in the solution and more solid copper is formed (the copper electrode gains mass/weight) As the CuSO4 solution loses copper ions, there will be free SO4 2- ions floating about. These moves through the salt bridge and reacts with the free floating excess Zn2+ ions in the zinc sulfate solution. So bottom line, the zinc metal turns into zinc ions in a solution, the copper ions in the other solution turns into copper metal. (Zinc electrode loses mass, copper electrode gains mass) I hope this was clear to you :)
-Sincerely Norwegian Chemistry and Biology student :)
Thanks. I have always found it strange that I can master quantum physics and general relativity at the graduate level, but freshman chemistry is still hard for me.
That's cool. I've never done physics, but I'm doing HL chemistry and biology atm. And off the two I find chemistry really interesting
this video came at perfect timing because this is what we're learning in APChem right now :)
1:55 I don't understand why manganese dioxide has a formula of Mn4O2, I thought it would be MnO2. Can someone please explain?
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!
Around 1:55. I see a small error in the explanation of the half-reaction. Manganese(IV) Oxide is erroneously labeled Mn4O2 instead of MnO2. It is later corrected.
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.
i might actually pass my midterm now, thanks Hank
If you google "alkaline cell" and take a look at any diagram, the cathodic plate is always the top and the anodic plate the bottom. Perhaps this is just due a discrepancy in conventional current vs flow of electrons as you said?
I applaud anyone who didn't have to consistently positive video to take in every sentence he said
Being a space science junky, the “electron vacuum” bit was worth its weight in gold in my attempt to understand this.
this was put together very well... this also reminded me how I hated the chemistry lingo..
oxidation is loosing elections but not be confused with reduction which is gaining but however the reducing agent is.... general chemistry wasn't one of my most enjoyable classes. to anyone that plans on taking it, I would recommend taking higher level physics and math first if possible. i see a lot of people get discourage from this course that have a lot of potential.
do Crash Course Maths, I NEED IT! NOW!
Is it just me or Hank looks super excited today. ☺️☺️
9 years later and hank green still explains really well
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?
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 work for a company that does pretty large scale electroplating and they use Lead anodes in the Chrome tanks. I dont know if that is industry wide but just what we do. FYI.
It's confusing but. . . Electron flow is from Cathode(Negative) to Anode(Positive). What we measure in electricity is not the flow of the electrons exactly, but rather the flow of positive charge from Anode to Cathode.
lions growl, LEO goes GER
(losing electrons: oxidation) (gain electrons: reduction) but it gets confusing because the reducing agent is the opposite from that which is reduced etc
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
The function of the salt bridge is inaccurately described. The metal ions do not travel through the salt bridge from half-cell to half-cell. Ions from the salt bridge enter the solution to neutralize the charge. For example, in the Zn half-cell (anode) the negative ion is released from the salt bridge in solution to account for the addition of Zn2+ in solution (as Zn atoms lose electrons to the wire they dissolve into solution). The opposite occurs for the cathode solution.
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?
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!
Great video
FYI
Mn4O2 is manganese (I) oxide-Mn's charge is+1 NOT manganese (Iv) oxide.
MnO2 is manganese (IV) oxide
In batteries the Anode is the negative terminal and the Cathode is the positive!
In electrolysis and recharging it's the other way around...
speaking at a perfect pace gotta say I luv this
Doesn't a negative sign on Gibbs Free Energy indicate that the forward reaction is spontaneous? Because that means that the system is losing or giving off energy, so it would make sense that no energy is required from an external source to make that happen.
And yet you surpass the quality of your videos. Thanks for being awesome :)
For people like myself, who hate when people talk slow when explaining things, thank you and salute you. So concise and quick.
Have my SAT 2 in chem in two days. Thank god for CrashCourse :)
Alkaline Battery best DESCRIBED..............LOVE CRASH COURSE
DRAM memory is composed by capacitors and they are small electric storage units(at least at chip level), probably your teacher was referring to that kind of storage but that's my opinion...
IT ALL MAKES SENSE NOW
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..
The annoying moment where my test is always the week before these episodes come out with a way to actually get stuff