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
Funny chemistry story (actually, not really, lab safety ain't no joke kids...): I once had my shirt disintegrated off me. A classmate walked right behind me and I didn't know he was there and I bumped into him. I don't remember the concentration, but unfortunately for me he was carrying a tray with phosphoric acid. It wasn't life threatening but about an hour later while riding the bus home, I was feeling a little itchy on my shoulder where the acid spilled on me. I reached back to scratch it and my shirt just started...well...disintegrating at the touch. I lost the whole upper right side of my shirt. Confused the hell out of the bus driver, who noticed my current state of attire as I was exiting the bus, before she could ask I said, "Don't worry, I just had acid spilled on me in chemistry." I then proceeded to take long and thorough shower as soon as I got home.
A 'friend of a friend' being funny in class when lab safety was being covered - you know: "don't inhale directly, just waft it towards you", was being a typical asshat and while repeating something to the effect of "ahh, the wafting sensation" was a little too vigorous, and waved too hard, or inhaled too deeply, but definitely knocked himself out. He made a full recovery, and the rest of my High School life was filled with a "enjoy the wafting sensation" joke whenever someone passed gas in that group of friends. As teenage boys, you can image, it was often. Incidentally, we did *not* in fact enjoy it, at all. -Shawn
Crash Course is undoubtedly the best educational channel on RUclips. However, it would be great if more topics could be incorporated by adding more series, like physics, math, and a series specifically on DNA or something. I really appreciate what you guys do, so thank you! #CrashCourse
Well now there is psychology, philosophy, and I think they will only continue to expand their range of topics. Especially, as more students, and whatnot, discover their channel.
I'm lucky enough to have a great one. They're quite rare. ..Except I'm missing a shit ton of school because I'm sick and Hank's a great teacher too. :D
Yeah...my chem teacher is like "Here is a worksheet with some notes...sorta...figure out this whole unit, I'm not going to explain anything.....here is your test. 20 questions...oh, why did all of you fail?"
I love the way that Chemistry is handled in these videos. It makes Chemistry seem like a fun, easy to understand science, as opposed to an impossibly difficult science that a lot of media portrays it to be. That, and these videos are extremely helpful for brushing up on material learned in the classroom.
I really wish i could have seen this channel back in high school when my chemistry teachers sucked and made me hated the subject. You make chemistry much more of fun than boring equations, man!
Just to make sure I have this right as some of the calculations set out below seem incorrect: For 1 metric ton of coal containing 3% Sulphur the following applies: 30 Kg of Sulphur requires as calculated in the video: 30000 g of S / 32.065 = 935.59956 moles then as 1 mole of S reacts with 1 moles of CaCo3 = 935.59956 * 100.09 = 93644.159 g which is = 93.64 Kg of CaCo3 to fully neutralize it producing 112.431 Kg of CaSo3. Therefore you need ~ 3.12 Kg of CaCo3 to neutralize 1 Kg of Sulphur. Knowing this, the approximate answers would be as follows for 1x10^9 metric tons of coal: The amount of Sulphur produced from 1 metric ton of coal = 30 Kg * 1 billion = 3.0x10^10 Kg of S produced. The amount of CaCo3 needed for 1 metric ton of coal = 93.64 * 1 billion = 9.364x10^10 Kg of CaCo3 needed (which is 3.121 times the amount of Sulphur produced). Finally the amount of CaSo3 produced from 30 Kg of Sulphur reacting with 93.64 Kg of CaCo3 = 112.431 * 1 billion = 1.12431x10^11 Kg of CaSo3 produced. RFM for Sulphur = 32.065 g RFM for CaCo3 = 100.09 g RFM for CaSo3 = 120.17 g Good luck to all!
Hank, I can never thank you enough for those crash courses! After a semester without chemistry, I definitely needed to freshen up my knowledge to be able to follow my "Industrial applications of chemistry" class in college. Thank you (and the whole team) so much! :D
+Frederick Schulze Haha xD got high school exams in 2 days, need to learn all subjects from scratch since I don't go to school... French will kill me, don't speak a word of it and need to be near-native in 6 days :c
+pianosRepic wow you are FUCKED but as a pretty good french student if you learn how to conjugate into the past and future tenses that should get you pretty far as a speaker
+Sexual Chocolate exams are state regulated in the Netherlands, you can just sign up, pay 500 euro's or so and take the exams, even if you are a homeless dude or a couch potatoe like yours truly
+Atomic Ninja Neither is Bill Nye. Evangelism's definition specifically refers to conversion to Christianity. Bill Nye is not telling people to be atheist or agnostic, but is merely anti-religion. And rightly so.
Excellent episode. But just wanted to mention that the final definition mentioned in this episode for Acids and Bases is the Bronsted-Lowry definition. The more accepted and universal definition is Lewis Acids and Bases which covers a broader part of chemistry that undergo similar reactions.
A few years ago, a group of my friends and I had to do a project about a problem in the world and we did it about acid rain in Africa and talked about adding limestone to rain water to make it better for drinking. Now I finally understand the chemistry!
Hank and Crash Course team, thank you so much for making chemistry much more interesting, keeping me awake and making me feel motivated with your informative lectures, jokes and illustrations. I am grateful that someone is able to break concepts down for me so I don't fail my Chem 2 class. You never disappoint!(:
gosh I wish these videos were around last year when I took AP Chem. my teacher was totally incapable of connecting with my learning style no matter how many times I asked for help, and I came REAL close to failing. I feel like I understand everything so much better now... it makes my life so much easier...or it would have, if I was still taking chem, haha. I guess I just have to find a way to incorporate more chemistry into my life...
Yeah,but strong acids don't wait for a family to come,they just break down someones doar and frow the kid in the house,while a strong base breaks into your house and steels the baby.
Andy Su Well, one paper cut is surely not gonna cut it, no pun intended. And come on, if I stay by the drawing table I'm definently gonna be safe from all that other stuff
The answer to the question in the video: Since a ton (1000kg) of coal produces 30kg of sulfur, a billion tons (1,000,000,000kg) would produce 30,000,000kg (30,000,000,000g) of sulfur. The molar mass for limestone (CaCO3) is 32.1 g/mol. 30,000,000,000 g ÷ 32.1 g/mol = 934,579,439.3 moles of sulfur. Since one mole of sulfur equals one mole of CaCO3 used, 934,579,439.3 moles of limestone is needed. The molar mass of CaCO3 is 100.1 g/mol. 934,579,439.3 mol × 100.1 g/mol = 9.36 × 10^10 g = 93,4441,401.87 kg of CaCO3 93.4 million kilograms (94 thousand tons) of limestone would be used. (sorry I didn't count the significant digits in my calculations. Pls correct me if I had a mistake. Also, after reading this, you may as well guess my age.)
Thanks, I was looking for this comment. Intelligence is a poor thing to judge age based on, but based on the fact that you're asking I would hazard a guess at around 15. Also; what no Stoichiometetric equation?!? Just kidding. ^_^
Be careful with the powers of 10 when converting tons to kilogramms. A billion tons = 1,000,000,000 tons = 1,000,000,000,000 kg = 1,000,000,000,000,000 g (1000^5 or 10^15 grams), so 30,000,000 kg of sulfur that you calculated would be the amount produced by a million tons of coal. For a billion tons of coal approximately 93.6 billion kilograms (96 million tons) of limestone would be needed
I love your videos. Not to sound stupid, but at times you talk so fast, it can be hard to follow your concepts. I guess that is why there is a replay button. :) Please keep making videos!
Oh hey, how did you guys do? I'm doing an overnight Crash Course Chem marathon for my semester exam tomorrow. I have a different schedule that conflicts with school (leading up to my finals, I go at a different pace), and even though semester exams are internal, if I get an F tomorrow (or anything below a B, actually) my Chemistry teacher is going to seethe. So basically.. I'm doomed.
Jefferson Moordenaar Nope... never researched... I'm so frustrated with keeping up with all news and things online that it has come to a point where I need to know about literally everything and everyone regardless whether I do or don't care about them...
holy shit Hank Green; I've been paying attention to you for a minute, but you really seemed involved in this episode. What do we have to do to fully support you and your crew to a level as Bill Nye?
What a great Crash Course! I have wanted to see something like this for a very long time. I knew I was really interested in chemistry, but not all the details, and found it very hard to find any really great educational shows about it. Hank presents it better than I could have hoped for: it's fun to learn the material. Hank and John are my new heroes - seriously. This material and others like it to follow can completely democratize education. May everyone find out about it.
You are incorrect at 10:42. You stated that when a base donates a proton it forms a conjugate acid. Bases do not donate protons, but rather accept them. You should have stated that when a base accepts a proton, it forms a conjugate acid. Please fix this and thanks for the great video!
Can you guys please make a video for back titrations? Your videos always make more sense than all other RUclips tutors :) as students you are our lifeline, and we really appreciate the work and research that goes into each lesson. Thank you!!
Go Brown! As suggested by one of the best TV hosts ever, Mike Rowe. Cleanish coal is better than no coal. You can't just shut off all the coal plants in the US like a light switch. You have to phase them out slowly while other energy sources are put in place. Going green isn't always an option, but you almost always start by going brown.
I got 320679320.679. Here's my process: 1) Find 3% of 1 billion, which is 30,000,000. 2) Find the amount of grams in 30,000,000 kilograms, which is 30,000,000,000. 3) Find the amount of sulfuric moles in 30,000,000,000 grams , which is 963,000,000,000. 4) Find how much Calcium Carbonate this translates to, as Calcium carbonate has a molar mass of 100.1, ANS = 9620379620.38 grams. 5) Reduce this number back to kilograms, which ends up being a tidy 9620379.62038 kilograms, or about 9620 metric tons.
Your method is correct but you made a mistake on step 1. Find 3% of 1 billion TONNES, not 1 billion. 1 billion tonnes = 10^15g 3% of 10^15g = 3x10^13g Number of S moles in 3x10^13g = 9.36x10^11 moles (might have different answer in this step depending one what value you have for sulfur's relative atomic mass). CaCO3 molar mass = 100.1g (100.1) x (9.36x10^11) = 9.37x10^10kg Convert kg to tonnes (divide by 1000) ~ 9.37x10^7 tonnes of limestone. But yeah otherwise well done. Just remember to check your SI units. :)
+Tom Ricketts Actually, your method of rounding may be flawed. As sulphur has an atomic mass of 32,065 or a molar mass of 32,065 moles, you get the value of there being 9,35453696*10^11 moles. As 4 is a smaller number than 4, the correct manner of approximation would be to round downwards to n(S)=9,35*10^11 mol.
It's called "Crash Course" for a reason. It doesn't go into the deeper details, but instead gives the general oversight and helps people grasp the baser ideas of a given subject and then move onto the more advanced material at their own rate. Crash Course doesn't go into the same detail as a Textbook will, but is easier to understand. In order to move to more advanced material, one requires the base knowledge that could be provided by this video.
gah. damn it, I don't know if it's me or what.But i think he's speaking too fast I love this channel and everything but...Gaaah. Gaaaah. I hope I can understand this soon.Exams are coming up.Damn it.
+Yoshioka Futaba Yes, you can lower or increase speed on almost any computer or laptop. I actually watch this at 1.7x faster than normal, but if 1.0 is too fast for you, you can try 0.7x or even 0.5x. If you don't see the option on RUclips automatically, try an excellent Chrome extension called Video Speed Contoller.
when you eat or drink something acidic your mouth secretes saliva in an attempt to neutralize the acid and prevent it doing harm - so it makes perfect sense.
It does make sense that *he* would salivate, but I salivated just from watching it. I know it happens, one salivates just from looking at food sometimes, but there's probably some cool psychology in there somewhere.
I'd say it's simple empathy (the natural human ability to imagine one's self doing something another is doing). It is so natural that sometimes it's easy to forget how incredible it really is - to cause a physical reaction in your body in response to seeing Hank eat a lemon (over a year ago and presumably a great distance away) in this case!
James Atha Bro I know that happens to me whenever I see someone eat a lemon or even just thinking lemon or typing lemon. I have a sour mouth as I am writing this
***** 200 60mg Pseudophedrine HCL pills (Actifed, Sudafed, Suphedrine, etc.) 1 1/2 cups Ammonium Nitrate fertilizer (33-0-0) 3 cans starting fluid 3 AA Energizer Lithuim Batteries 1 bottle Red Devil brand Lye 2 caps of water (use the top off the 2 liter) 1 box Iodized Salt 1 bottle Liquid Fire brand drain opener now shake n bake.
I just finished my first semester in my four year Industrial Chemistry course and it’s official...I have fallen in love with Chemistry all over again 😂😂😂
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
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
Pin the answer to the limestone question! :P
*An aspiring chemist watching crash course*
”chemist die younger than the average person”
*re-thinks life*
actually tho
that was me
There used to be a DJ called DJ Titrate. He always loved to drop the base (into acids).
LOL
Sounds salty
But did he drop acid?
Now, every time I drop soap in the shower, I am going to that I "dropped the base".
Shame on you.
Lol
**HEARS HIMSELF SINGING ALL ABOUT THE BASS EXCEPT ITS NOW BASE**
Just don't do it in prison ;)
@@CoreHope1331 LMAO I was about to say that. I'm glad I wasn't the only one who thought of that
Funny chemistry story (actually, not really, lab safety ain't no joke kids...):
I once had my shirt disintegrated off me. A classmate walked right behind me and I didn't know he was there and I bumped into him. I don't remember the concentration, but unfortunately for me he was carrying a tray with phosphoric acid. It wasn't life threatening but about an hour later while riding the bus home, I was feeling a little itchy on my shoulder where the acid spilled on me. I reached back to scratch it and my shirt just started...well...disintegrating at the touch. I lost the whole upper right side of my shirt.
Confused the hell out of the bus driver, who noticed my current state of attire as I was exiting the bus, before she could ask I said, "Don't worry, I just had acid spilled on me in chemistry." I then proceeded to take long and thorough shower as soon as I got home.
A 'friend of a friend' being funny in class when lab safety was being covered - you know: "don't inhale directly, just waft it towards you", was being a typical asshat and while repeating something to the effect of "ahh, the wafting sensation" was a little too vigorous, and waved too hard, or inhaled too deeply, but definitely knocked himself out. He made a full recovery, and the rest of my High School life was filled with a "enjoy the wafting sensation" joke whenever someone passed gas in that group of friends. As teenage boys, you can image, it was often. Incidentally, we did *not* in fact enjoy it, at all.
-Shawn
I learned more from this 11 minute video than I did the past month in school
I literally just told a friend of mine "I learned more in 20 minutes on this channel than 1 month in school". High five!
タイトル何て自分で考えなさいな
Same here !!!!!
same here
past year'
You must have some shitty teachers? You were probably just zoning out in class.
Crash Course is undoubtedly the best educational channel on RUclips. However, it would be great if more topics could be incorporated by adding more series, like physics, math, and a series specifically on DNA or something. I really appreciate what you guys do, so thank you! #CrashCourse
+CrashCourse
+David Feng Crash Course Physics started a few days ago and it is awesome. :D
David, the boseman science channel has some really good videos on DNA and other grade 12 biology topics
watch Kahnkademy it helps me a lot, these two channels xD
Well now there is psychology, philosophy, and I think they will only continue to expand their range of topics. Especially, as more students, and whatnot, discover their channel.
I'll never get enough of Crash Course. . .every review is perfectly wittingly constructed and presented.
The worst thing that could happen is having a bad teacher. -cough- -cough- -cough- you know who you are bad chem teachers
Walter White?
Free Toothpaste Too soon, free toothpaste, too soon.
I'm lucky enough to have a great one. They're quite rare.
..Except I'm missing a shit ton of school because I'm sick and Hank's a great teacher too. :D
Walter White is the best chemistry teacher ever. One of his students even became a millionaire with him!
Yeah...my chem teacher is like "Here is a worksheet with some notes...sorta...figure out this whole unit, I'm not going to explain anything.....here is your test. 20 questions...oh, why did all of you fail?"
Thanks!
I love the way that Chemistry is handled in these videos. It makes Chemistry seem like a fun, easy to understand science, as opposed to an impossibly difficult science that a lot of media portrays it to be. That, and these videos are extremely helpful for brushing up on material learned in the classroom.
Hank is out of his office!? What!?!?!? Mind. Blown.
crazy right
The first 13 seconds pretty much sum up my life
Sames
haven't got to the last part ... yet. :')
lol sameee
ze62948 how do you fail chemistry?
It's a hard concept to grasp.
I really wish i could have seen this channel back in high school when my chemistry teachers sucked and made me hated the subject. You make chemistry much more of fun than boring equations, man!
Just to make sure I have this right as some of the calculations set out below seem incorrect:
For 1 metric ton of coal containing 3% Sulphur the following applies:
30 Kg of Sulphur requires as calculated in the video: 30000 g of S / 32.065 = 935.59956 moles then as 1 mole of S reacts with 1 moles of CaCo3 = 935.59956 * 100.09 = 93644.159 g which is = 93.64 Kg of CaCo3 to fully neutralize it producing 112.431 Kg of CaSo3. Therefore you need ~ 3.12 Kg of CaCo3 to neutralize 1 Kg of Sulphur.
Knowing this, the approximate answers would be as follows for 1x10^9 metric tons of coal:
The amount of Sulphur produced from 1 metric ton of coal = 30 Kg * 1 billion = 3.0x10^10 Kg of S produced.
The amount of CaCo3 needed for 1 metric ton of coal = 93.64 * 1 billion = 9.364x10^10 Kg of CaCo3 needed (which is 3.121 times the amount of Sulphur produced).
Finally the amount of CaSo3 produced from 30 Kg of Sulphur reacting with 93.64 Kg of CaCo3 = 112.431 * 1 billion = 1.12431x10^11 Kg of CaSo3 produced.
RFM for Sulphur = 32.065 g
RFM for CaCo3 = 100.09 g
RFM for CaSo3 = 120.17 g
Good luck to all!
Hank, I can never thank you enough for those crash courses! After a semester without chemistry, I definitely needed to freshen up my knowledge to be able to follow my "Industrial applications of chemistry" class in college. Thank you (and the whole team) so much! :D
When you need to watch crash course on 1.5x speed because of test in 7 minutes...
+Frederick Schulze Haha xD got high school exams in 2 days, need to learn all subjects from scratch since I don't go to school... French will kill me, don't speak a word of it and need to be near-native in 6 days :c
+pianosRepic wow you are FUCKED but as a pretty good french student if you learn how to conjugate into the past and future tenses that should get you pretty far as a speaker
sounds like a strategy :P thanks
+pianosRepic You're taking a school exam but don't go to school...hmm. My bullshit-o-meter is going of the scale
+Sexual Chocolate exams are state regulated in the Netherlands, you can just sign up, pay 500 euro's or so and take the exams, even if you are a homeless dude or a couch potatoe like yours truly
"now, you may be wondering: 'who's been coming by, and throwing sulfuric acid on STATUES?'" it has been five minutes and i'm still laughing :D
You're like the Bill Nye for adults. So informative and you make it easy to understand. Thank you!
***** I'm going to be a freshman
o really.......
o really.......
+arielartista and better.He is not evangelist atheist
+Atomic Ninja Neither is Bill Nye.
Evangelism's definition specifically refers to conversion to Christianity.
Bill Nye is not telling people to be atheist or agnostic, but is merely anti-religion. And rightly so.
Dear Hank, Please can we have some "Chemistry, Causing problems ... But also fixing them" Tee shirts, they would kick so much ass
dear hank,
how abut chemistry in technology?
anyone?
O.K. so if Vlog Bros Inc won't make them, would taking an excerpt of dialogue and transcribing it to a T-shirt count as fair use?
+ben middleton ya they didnt copyright that exact line so go ahead sell them urself
mrpkmnfrk sod selling them, I just wanted one for myself, although...
"Causing problems... but also providing solutions"?
PLEASE CAN WE HAVE CRASH COURSE PHYSICS
+Thingonometry - yeah
+Thingonometry - Yes, please!
+Thingonometry - Puhleassseeeee
+Thingonometry - would be totally cool if they got Brian Cox to host it
And also Geography PLEASE
Excellent episode. But just wanted to mention that the final definition mentioned in this episode for Acids and Bases is the Bronsted-Lowry definition. The more accepted and universal definition is Lewis Acids and Bases which covers a broader part of chemistry that undergo similar reactions.
A few years ago, a group of my friends and I had to do a project about a problem in the world and we did it about acid rain in Africa and talked about adding limestone to rain water to make it better for drinking. Now I finally understand the chemistry!
Hank and Crash Course team, thank you so much for making chemistry much more interesting, keeping me awake and making me feel motivated with your informative lectures, jokes and illustrations. I am grateful that someone is able to break concepts down for me so I don't fail my Chem 2 class. You never disappoint!(:
Chemistry, the cause and solution to all our problems.
Soap is a base. People say "Drop the base"
Does this mean drop the soap?
This world is evil.
Surprisingly the Fine Bros haven't taken this video down
+someboredinsaneasian banter
Why would they?
the word "reactions"
someboredinsaneasian ohhhhhhhhhhhhhhhh
What are the fine bros?
gosh I wish these videos were around last year when I took AP Chem. my teacher was totally incapable of connecting with my learning style no matter how many times I asked for help, and I came REAL close to failing. I feel like I understand everything so much better now... it makes my life so much easier...or it would have, if I was still taking chem, haha. I guess I just have to find a way to incorporate more chemistry into my life...
Dear Mr. Hank Green, you are a legend. Thank you for this video!!
Jag ÄLSKAR den som gjorde den svenska översättningen av denna video! All cred till dig!
This man ate a lemon for our education! Much respect
Honestly, Crash Course is the only reason why I haven't failed my college-level General Chemistry class xD
So, an acid is like two parents setting their child up for adoption, while a base is like the orphanage taking the child in. Just saying.
a bit Grimm analogy, but usefull
JACOB SARTOURIOUS
Yeah,but strong acids don't wait for a family to come,they just break down someones doar and frow the kid in the house,while a strong base breaks into your house and steels the baby.
yeah that's one type
Vlad the Impaler were u inspired by "Dracula untold" fr ur name?
Hank Green you are a real bless for humanity. It's a pity I get to know your videos so late, but it's a bless that I know them at all
Woah is that DeadMau5?
I LOVE THIS EVEN MORE
Derpy :)
1:28 LMFAO that extreme close up of Captain John Mullan's face cracked me up. Hank, as always, thanks for being awesome.
Yeah, I think I'm gonna stick to studying physics and math, seems like I'm at lower chance of, well, dying if I choose that instead
You might bleed to death in math due to a paper cut or die in a physical moment(ex:rockets and carcrashes) in physics.
Andy Su Well, one paper cut is surely not gonna cut it, no pun intended.
And come on, if I stay by the drawing table I'm definently gonna be safe from all that other stuff
Also, a cat might come and scratch you up... if it survives the nuclear bunker, that is...
Punit Daga Now why would I have a cat?
Schrodinger's cat?
The answer to the question in the video:
Since a ton (1000kg) of coal produces 30kg of sulfur, a billion tons (1,000,000,000kg) would produce 30,000,000kg (30,000,000,000g) of sulfur.
The molar mass for limestone (CaCO3) is 32.1 g/mol.
30,000,000,000 g ÷ 32.1 g/mol = 934,579,439.3 moles of sulfur.
Since one mole of sulfur equals one mole of CaCO3 used, 934,579,439.3 moles of limestone is needed.
The molar mass of CaCO3 is 100.1 g/mol.
934,579,439.3 mol × 100.1 g/mol = 9.36 × 10^10 g = 93,4441,401.87 kg of CaCO3
93.4 million kilograms (94 thousand tons) of limestone would be used.
(sorry I didn't count the significant digits in my calculations. Pls correct me if I had a mistake. Also, after reading this, you may as well guess my age.)
Thanks, I was looking for this comment.
Intelligence is a poor thing to judge age based on, but based on the fact that you're asking I would hazard a guess at around 15.
Also; what no Stoichiometetric equation?!?
Just kidding. ^_^
Be careful with the powers of 10 when converting tons to kilogramms. A billion tons = 1,000,000,000 tons = 1,000,000,000,000 kg = 1,000,000,000,000,000 g (1000^5 or 10^15 grams), so 30,000,000 kg of sulfur that you calculated would be the amount produced by a million tons of coal. For a billion tons of coal approximately 93.6 billion kilograms (96 million tons) of limestone would be needed
Reawaken :3 The molar mass for limestone is not 32.1g/mol... it's about 100.1 g/mol. Won't that change the final answer?
Sean Crockett wait nevermind that's a typo on your part, you probably meant to say sulfur instead of limestone
Reawaken :3 dude you rock ahah
I love your videos. Not to sound stupid, but at times you talk so fast, it can be hard to follow your concepts. I guess that is why there is a replay button. :) Please keep making videos!
You can’t understand him?
Can you understand a New Yorker?
We talk faster.
you can press the settings button and adjust the speed to 0.75 which is much better
I really respect this channel and those who works for it
Dear Hank Green,
Thank you so much for saving my university chemistry grade from impending doom.
Hank: ”chemist die younger than the average person”
also Hank: A small price to pay for salvation
oh the metric/SI units... feels so good...
Hank at 3:24
CANT STOP LAUGhing!! This guy is legit!! Superrrrr
5:16 on the right hand side...
Thank you so much for this video!!! CrashCourse has saved me on soooo many tests...
About 93,551.4 tons of limestone needed- 9:50
Last-minute cramming for the AP exam...anyone else?!
Mine is today, maybe we're taking the same exam.
Oh hey, how did you guys do? I'm doing an overnight Crash Course Chem marathon for my semester exam tomorrow. I have a different schedule that conflicts with school (leading up to my finals, I go at a different pace), and even though semester exams are internal, if I get an F tomorrow (or anything below a B, actually) my Chemistry teacher is going to seethe. So basically.. I'm doomed.
*****
Guessed on a third of the questions. Everybody did bad so we go a curve.
+Yoshi's VGM just curious, how did it went, did watching CCC helped?
Of course another AP kid announcing to the world that yes in fact he is in AP
6:23 I didn't know Deadmau5 had a strong base. His attitude gives me acids.
wait wait wait... slow down... I don't get it.
He is that DJ with the mouse hat...
Punit Daga And do you know his attitude in Twitter and public?
Jefferson Moordenaar Nope... never researched... I'm so frustrated with keeping up with all news and things online that it has come to a point where I need to know about literally everything and everyone regardless whether I do or don't care about them...
Punit Daga Nah this is nothing like that, Ik what you mean.
Just look up on Joel's Twitter feuds and you would know.
5:33 Really appreciate the Arrested Development reference. Also, these videos help immensely.
Once again crash course teaches me more than 12 years of school in a 10 minute video filled with humour and practical examples :) Thanks guys
you remind me of Bill Nye. my goal is to be like you guys eventually!
Jenefer Motta I hope you reach your goals 🤙🤙
this channel make me love chemistry and physics...
yep me too
holy shit Hank Green; I've been paying attention to you for a minute, but you really seemed involved in this episode. What do we have to do to fully support you and your crew to a level as Bill Nye?
THANK YOU. After I watch this a couple more times I'm confident I will finally understand protonation. Maybe.
I think i am really sticking to chemistry after listening the above video.Thank you,as in
India ,teachers are not worth enough
The equation at 6:58 is unbalanced. put a 2 in front of SO_2 and H_2O
9.36 x 10^7 metric tonnes of CaCO3
The sulfur acid equation at 06:57 is not balanced:
02 + SO2 + H20 -> 2H2SO4
[BALANCES AT]
O2 + 2H20 + 2SO2 -> 2H2SO4
Thanks. Wondered why my kg of CaCO3 was double of his value.
I noticed that as well, but just thought I was stupid and missed something so I re watched the video 😂😂
Amazingly unbiased, helpful and informative ! I'm subscribing.
What a great Crash Course! I have wanted to see something like this for a very long time. I knew I was really interested in chemistry, but not all the details, and found it very hard to find any really great educational shows about it. Hank presents it better than I could have hoped for: it's fun to learn the material. Hank and John are my new heroes - seriously. This material and others like it to follow can completely democratize education. May everyone find out about it.
For myself and others who need to revise important concepts:
3:58
Anyone else catch George and Lucille at 5:34?
You are incorrect at 10:42. You stated that when a base donates a proton it forms a conjugate acid. Bases do not donate protons, but rather accept them. You should have stated that when a base accepts a proton, it forms a conjugate acid. Please fix this and thanks for the great video!
I noticed that too.
Umm if you paid attention earlier at 4:02 he literally said that a base accepts a proton. So calm down.
Thanks, Hank! We love your show. I homeschool my kids and we have so much fun watching your videos as a supplement to our curriculum.
My great uncle was a chemist and half of his face LITERALLY MELTED!!
am i the only one not watching this for a test?
I am as well! I find this fascinating.
im watching it for a projects does that count?
Prez Taco well, it isnt for your enjoyment.
hah, never :P
I graduated years ago . I just like watching crash course.
About 93,551.4 tons of limestone would be needed.
Please show work..
Nope, it's 94 million ton of limestone per billion ton of coal.
This is approx.
@@807pranavghandade8 Damn
94.5 million tons taking sig figs into account.
The music bit was pretty well done.
YOU ARE WHAT IS KEEPING ME FROM FAILING MY CHEMISTRY EXAM!
THANK YOUUUU
Using this to revise acids and bases is way more fun that any other revision I've done
loved the hendrix reference
Good video, except there was one error, At 10:43, it's supposed to be when a base accepts a proton it becomes a conjugate acid.
Whoever is reading this, I just want to say, have fun with your life and enjoy it as long as you live
rocke boy be careful, because Chemistry causes death.
you just cured my depression from cramming too much
I appreciate that...really, and you do the same.
Excellent subtle reference to arrested development. Your work is appreciated.
Can you guys please make a video for back titrations? Your videos always make more sense than all other RUclips tutors :) as students you are our lifeline, and we really appreciate the work and research that goes into each lesson. Thank you!!
this channel needs a math playlist.
True
Hank, could you please put up IGCSE level sciences for us GCSE students?
especially when its finals week oh my god
NO wonder I like this guy... from my home state
This episode is one of the best produced episodes I've seen
I love the graphic for conjugal! Absolutely fantastic!
Go Brown! As suggested by one of the best TV hosts ever, Mike Rowe. Cleanish coal is better than no coal. You can't just shut off all the coal plants in the US like a light switch. You have to phase them out slowly while other energy sources are put in place. Going green isn't always an option, but you almost always start by going brown.
Going "green", haha. But yes I agree with you.
I got 320679320.679. Here's my process:
1) Find 3% of 1 billion, which is 30,000,000.
2) Find the amount of grams in 30,000,000 kilograms, which is 30,000,000,000.
3) Find the amount of sulfuric moles in 30,000,000,000 grams , which is 963,000,000,000.
4) Find how much Calcium Carbonate this translates to, as Calcium carbonate has a molar mass of 100.1, ANS = 9620379620.38 grams.
5) Reduce this number back to kilograms, which ends up being a tidy 9620379.62038 kilograms, or about 9620 metric tons.
Your method is correct but you made a mistake on step 1.
Find 3% of 1 billion TONNES, not 1 billion. 1 billion tonnes = 10^15g
3% of 10^15g = 3x10^13g
Number of S moles in 3x10^13g = 9.36x10^11 moles (might have different answer in this step depending one what value you have for sulfur's relative atomic mass).
CaCO3 molar mass = 100.1g
(100.1) x (9.36x10^11) = 9.37x10^10kg
Convert kg to tonnes (divide by 1000)
~ 9.37x10^7 tonnes of limestone.
But yeah otherwise well done. Just remember to check your SI units. :)
God dammit the units strike again. Shoulda listened to Mrs. Brown when she said to keep the units written.
+Tom Ricketts Actually, your method of rounding may be flawed. As sulphur has an atomic mass of 32,065 or a molar mass of 32,065 moles, you get the value of there being 9,35453696*10^11 moles. As 4 is a smaller number than 4, the correct manner of approximation would be to round downwards to n(S)=9,35*10^11 mol.
ZewdPlays
you broke my brain
Love the video, but you didn't talk about the Lewis theory of acids and bases!
He he did
Crash course smoothed out biology; now it's pulling me through chem. Thanks guys! These videos are freakin awesome!
It's called "Crash Course" for a reason. It doesn't go into the deeper details, but instead gives the general oversight and helps people grasp the baser ideas of a given subject and then move onto the more advanced material at their own rate. Crash Course doesn't go into the same detail as a Textbook will, but is easier to understand. In order to move to more advanced material, one requires the base knowledge that could be provided by this video.
Can we PLEASE have Crash Course Math and Language Arts?
+Geometry Dash DarkBlocks ever heard of Khan Academy for math? also, what do u mean by Language arts? (schools no longer use that term)
FINALS TODAY STUDYING CRASH COURSE :D
HOW IN THE WORLD DID HE KNOW HW MY CHEMISTRY CLASS/ LIFE HAS BEEN?!?!?!??!?!
why forget all I know about acids and bases? this is exactly what i know about this topic, that's what school teaches
im here binge reviewing for my teas test tomorrow.. yay
gah. damn it, I don't know if it's me or what.But i think he's speaking too fast I love this channel and everything but...Gaaah. Gaaaah. I hope I can understand this soon.Exams are coming up.Damn it.
You can lower the speed if you are on desktop
oh. okay ill try that out. gee, thanks!
+Yoshioka Futaba did you try captions?
+Yoshioka Futaba Yes, you can lower or increase speed on almost any computer or laptop. I actually watch this at 1.7x faster than normal, but if 1.0 is too fast for you, you can try 0.7x or even 0.5x. If you don't see the option on RUclips automatically, try an excellent Chrome extension called Video Speed Contoller.
You are a dosshbag
4:24 should be Cl- not CL-
The font is in caps so its hard to tell the molecule
lol i was waiting for him to bite the soap, too xd
Love the Arrested Development reference at 5:31!
this guy just taught me everything I have spent the entire day reading about in my chem book... in 11 minutes... i think I'll go cry now
When you ate that lemon slice I salivated. Just though that was interesting.
when you eat or drink something acidic your mouth secretes saliva in an attempt to neutralize the acid and prevent it doing harm - so it makes perfect sense.
It does make sense that *he* would salivate, but I salivated just from watching it. I know it happens, one salivates just from looking at food sometimes, but there's probably some cool psychology in there somewhere.
I'd say it's simple empathy (the natural human ability to imagine one's self doing something another is doing).
It is so natural that sometimes it's easy to forget how incredible it really is - to cause a physical reaction in your body in response to seeing Hank eat a lemon (over a year ago and presumably a great distance away) in this case!
James Atha Bro I know that happens to me whenever I see someone eat a lemon or even just thinking lemon or typing lemon. I have a sour mouth as I am writing this
Its the anti-acid BASEically
Crash Course Physics? Crash Course Government? Crash Course Statistics? Crash Course MCAT/ Anatomy and Physiology? please?
*****
200 60mg Pseudophedrine HCL pills (Actifed, Sudafed, Suphedrine, etc.)
1 1/2 cups Ammonium Nitrate fertilizer (33-0-0)
3 cans starting fluid
3 AA Energizer Lithuim Batteries
1 bottle Red Devil brand Lye
2 caps of water (use the top off the 2 liter)
1 box Iodized Salt
1 bottle Liquid Fire brand drain opener
now shake n bake.
They did it all! Omg
all of those exsit
I just finished my first semester in my four year Industrial Chemistry course and it’s official...I have fallen in love with Chemistry all over again 😂😂😂
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