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
Loving these crash course videos. I have to take a chem assessment to be placed into a college chem class and I haven't taken chem for over a year so this was great.
I haven't even finished the video and I'm so glad I found this. Revising from the textbook given from school was just boring and this has actually done such an amazing job at making me interested in the subject. And yes, the Freddie Mercury and David Bowie reference is why I'm commenting.
Why is it that my favorite parts of this show are always when the thought bubble illustrates catastrophe? (3:10) Also, why is this woman flailing her arms around maniacally against trippy techno music? Shouldn't she be getting help for her epileptic first date? (I'm beginning to see why this is so entertaining for me . . .)
In my country, I learned that formula like Pv=Rtn, which (if you say it aloud) it sounds like "pavo ratón" ("turkey mouse", in English). It is funny. Or I guess so. Nevermind.
Hank, you are not old. As far as I know you don't complain about aches and pains or being old. And besides, you don't have to be old to like an old song, especially a really good one.
Hank - awesome job on all videos. I have a suggestion for a future project. The fire service and fires in general. While a noble institution the fire service is under educated in chemistry and physics. Serious injuries and death occur each year. UL and NIST are helping however a down to earth crash course in redox actions how to predict and protect yourself from extreme reactions and still be alive to watch your show might make a useful project. Cheers.
"Oxygen" is a chemical element. Its chemical symbol is O. Uppercase, always. At standard conditions (room temperature and pressure) it comes in diatomic molecules, O2, called "oxygen gas" in English. At high enough temperatures, the molecules break down into atoms. Ozone is O3. It is still oxygen as a chemical element, but a different chemical substance.
It wasn't covered in the video, but one of you probably knows. I've seen solutions described by "normality", for example 1.5 N H2SO4, but I never really understood it. How do I figure out molarity or mass percent from that?
Air as we know it is not a solution, it is a mixture . When sugar or even oxygen dissolves in liquid water there is an enthalpy change . There is no such energy change when oxygen gas is mixed with nitrogen gas. So it is just a mixture. The kinetic molecular theory of gases assumes this (elastic collisions , with only kinetic energy involved) . Non-interacting gases (like carbon dioxide and methane) can be separated by density in a centrifuge .
when it gets too hot, trout just head to the bottom of lakes to get to the colder water with all that yummy oxygen. rivers are usually colder then lakes so they dont necessarily need to get deeper.
Solvent is not always the component that's present in greater amount. Solvent is the constituent substance which has the same state of aggregation as the solution. In syrup, there's 40% water and 60% sugar, but solvent in syrup solution is water. But generally, the component in greater amount is the solvent.
I believe it has to do with the attraction of the ions being too strong for water's polarity to overcome without expending too much energy. That may also explain why many ionic compounds have a variable solubility depending on temperature. Some need energy added to dissolve. Some even need energy removed from the system to dissolve. Of course, I've been wrong before.
Solutions do wierd things to freezing points. Most notably, salt water solutions have a lower freezing point, so salt is added to defrost the roads. With all the chemicals (alcohol, sugar, CO2) in beer, it's freezing point in a pressurised container is probably a lot lower than regular water, if it freezes after taking it out and opening it it's probably the Carbon Dioxide preventing it from forming a full big crystal that is beer ice.
2 Part Question:1) How come when I pull a beer out of the freezer and it's not yet frozen the can seems weaker, 2) How come it suddenly freezes after I take it out and open it. ( I call that a glacial)
Question! Lets say you had a mixture of salt, sand, and sugar. Then you followed these steps: 1) Add water (20ml) to the mixture and stir until dissolved. 2) Using a filter apparatus and a beaker, filter the salt/sugar solution from the sand. Would there be any way to separate the salt from the sugar? Please be very specific in your reply, thanks in advance!
+bluebirdlifestyle First evaporate water. Add ethanol to the salt and sugar then only the sugar will be dissolved in the ethanol. Put the solution in a fine sieve and u will get the solid salt on the sieve. Evaporate ethanol from the solution and u get the solid sugar!
I was stubling across the internet and i came across a chem book that was banned for being to dangerous. If you want to find it look up the golden book of chemistry. It is not under copyright so there are free pdfs of it all over.
Question:: what causes a brain freeze? What is actually happening that makes it hurt? If you continued you drink something cold very fast and ignore the pain could it harm you?
There are nerves in your head that run close to the roof of your mouth that when they get cold, such as eating ice cream fast, send out a pain like signal. No ignoring this won't hurt you, it just won't be very pleasant.
Oh, I tried measuring carbon dioxide concentrations in soda by mass! If only I'd thought to use pressure, maybe my mentos rocket car would've performed better with a superior fuel...
Sci Show cover a very variety of scientific fields but it doesn't systematically teach you the important concepts you need to grasp for each subject, which is what Hank and John are doing with Crash Course. So there may very well be a Crash Course Physics in the future, although Hank once said that he may not be the best person to teach it.
Ahh, I can watch these at 1.25x speed, and it's actually the right information density to really enjoy them. I love this new variable video speed feature!
Another common measurement for the ratio between solvent and solute is volume percent. You can see it on just about any bottle containing an alcoholic beverage.
Well, the little bit of the oil that might dissolve in the water and the little bit of water that might dissolve in the oil would be the solutes. But unmixed oil and water is neither. Add some alcohol or soap, and you then can make a suspension, but that is completely another thing.
Oxygen is O. O2 is how it appears naturally. because it bonds to itself. (unless you go up to the ozone layer where it's O3 It's like Nitrogen. Or Hydrogen.
neither. If neither are dissolved in the other then why would either be a solute? however if you add something like soap, which has a molecule with a long non-polar tail and a polar 'head' on the end, then what you get is called an emulsion.
mass percent should be mass of solute/mass of solvent times 100 to give a %figure not times by 100% that would give x percent percent ( you did say to be precise)
that's because it's not really for you. I mean I assume that Hank would want you to enjoy it, but the whole point is that it is a "crash course," a quick run through of the subject. Although thinking about it the bio ones I felt went a little more in depth, although maybe I just felt that way because I know more about chem than bio.
So, I'm not sure Hank mentioned this or not, but for those of you who got super confused like I did, it turns out that the gas constant in the Ideal Gas Law changes when in a solution! That's why Hank's value for R is 0.08206 in this equation and not 8.3145. They also have different units; 0.08206 L atm/mol K and 8.3145 L kPa/mol K, I think it all depends on what unit of measurement you're using for Pressure? But I am not an expert, so if this is obvious I apologise, but it confused the hell outta me lol.
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
If you're ever feeling down, remember: you are a solution.
fairycatLJT You made my day!
+fairycatLJT LOL
+fairycatLJT INSTEAD OF A PROBLEM! I AM A WINNER
+fairycatLJT Wow that's good!!
Well someone's famous.....
2:14-- The question of all Chemistry
Loving these crash course videos. I have to take a chem assessment to be placed into a college chem class and I haven't taken chem for over a year so this was great.
Fiiiiit
+Nat Cat He really is great, isnt he?
Hank:And who’s made mostly of water?
Me: ...
Me:Aquaman?
Crash Course > Actual Chemistry Classes.
its around 4:30am, im cramming for an midterm at 8:00am and omg, i lost it at "Under Pressure" hahahah
love these videos,! they're sooooo helpful!
Once again Hank, awesomeness! Thanks for all the great content and huge help over the years on academic topics.
I haven't even finished the video and I'm so glad I found this. Revising from the textbook given from school was just boring and this has actually done such an amazing job at making me interested in the subject. And yes, the Freddie Mercury and David Bowie reference is why I'm commenting.
molarity and molality. now I'm certain that scientists are just messing with us
This made me ACE my honors exam! Just this video! thanks Hank!!!!!!
Do you live in Sri Lanka or something, how easy are your exams?
lol, has anyone tried playing at half speed? Hilarious, he sounds like he is drunk.
its hillariouss!! haha
lol I just did it
Lol thats the only way i can watch anymore
lol it does! You made my night !
Austin Hennessey you tried the half speed because he talks so damn fast.
I couldn't pay a lot of attention after the Bowie/Mercury joke due to laughter! LoL! 😂😂😂😂
really?
Is your life that boring?
@@mikeoxlong3894 you must be a fun person
😂😂😂 I loved it so much!! It was perfect
Dude same
Why is it that my favorite parts of this show are always when the thought bubble illustrates catastrophe? (3:10) Also, why is this woman flailing her arms around maniacally against trippy techno music? Shouldn't she be getting help for her epileptic first date? (I'm beginning to see why this is so entertaining for me . . .)
+Bryce “Bryce no. 6” Fergusson PS: ". . . paralysis, ehh suffocation, maybe some death." - Hank Green
In my country, I learned that formula like Pv=Rtn, which (if you say it aloud) it sounds like "pavo ratón" ("turkey mouse", in English). It is funny. Or I guess so. Nevermind.
Jajajajaja
Go back to your country, you ain’t welcome here.
I love you, Hank
under pressure... :-D I almost collapse at your flat jokes, Hank. Because I love flat jokes! :-D
you always do such a great job in these vids! thank you for this :)
I love the way he sang David Bowe ft Fred Mercuy's Under Pressure. So funny. Hank you're great.
Hank, you are not old. As far as I know you don't complain about aches and pains or being old. And besides, you don't have to be old to like an old song, especially a really good one.
I'll one up you and say that great music in general doesn't get old.
I've got my Solutions Final in like a half hour. Thanks for helping me study!!!
youre probably in college now--
wow, how the years fly by.
Hank - awesome job on all videos. I have a suggestion for a future project. The fire service and fires in general. While a noble institution the fire service is under educated in chemistry and physics. Serious injuries and death occur each year. UL and NIST are helping however a down to earth crash course in redox actions how to predict and protect yourself from extreme reactions and still be alive to watch your show might make a useful project. Cheers.
because of u I started loving chemistry thanks a lot hank .............FROM INDIA
Its awesome catching these videos just after release. It's like Hank is teaching me face to face :3
"Oxygen" is a chemical element. Its chemical symbol is O. Uppercase, always.
At standard conditions (room temperature and pressure) it comes in diatomic molecules, O2, called "oxygen gas" in English.
At high enough temperatures, the molecules break down into atoms.
Ozone is O3. It is still oxygen as a chemical element, but a different chemical substance.
I get far too much entertainment from watching these! :DDDDD
The bowie joke made me sad
+Jameson401 I Like your prof pic man
Man crash course (cc) is great!!!!!!!!!!!!. I actually loved it
I liked this video almost exclusively because of the Queen reference. Good on you Hank!!!
love the "under pressure"
It wasn't covered in the video, but one of you probably knows. I've seen solutions described by "normality", for example 1.5 N H2SO4, but I never really understood it. How do I figure out molarity or mass percent from that?
I learner this yesterday Normality =Molarity × n-factor . n-factor of H2SO4 is 2. So M=N/2=1.5/2=0.75Mol/L
"Under Pressure" - finally a song for people my age (even old than Hank Green)!
under pressure i love it you just made my day hank
4:15 best part...😂
The best part was when the video ended.
Air as we know it is not a solution, it is a mixture . When sugar or even oxygen dissolves in liquid water there is an enthalpy change . There is no such energy change when oxygen gas is mixed with nitrogen gas. So it is just a mixture. The kinetic molecular theory of gases assumes this (elastic collisions , with only kinetic energy involved) . Non-interacting gases (like carbon dioxide and methane) can be separated by density in a centrifuge .
Go hank! Never stop making these!
Thanks, I have a test tomorrow and I knew the crash course must have something
This vid really helped. Hopefully, its enough information for my End of course assessment tomorrow
THANK YOU FOR THE SUMMARY AT THE END!!!!!!!!!!
Thank you for mentioning one of my favorite songs
Thanks for helping me study last minute
when it gets too hot, trout just head to the bottom of lakes to get to the colder water with all that yummy oxygen. rivers are usually colder then lakes so they dont necessarily need to get deeper.
These are undoubtedly the best chem vids ever! Really helped...
Finally, equilibrium! I was wondering when you were going to get around to it. It's HUUUGE in Chemistry.
Neither Queen's or Bowie's music will ever get old
Solvent is not always the component that's present in greater amount. Solvent is the constituent substance which has the same state of aggregation as the solution. In syrup, there's 40% water and 60% sugar, but solvent in syrup solution is water. But generally, the component in greater amount is the solvent.
I believe it has to do with the attraction of the ions being too strong for water's polarity to overcome without expending too much energy. That may also explain why many ionic compounds have a variable solubility depending on temperature. Some need energy added to dissolve. Some even need energy removed from the system to dissolve. Of course, I've been wrong before.
anybody so used to hearing his voice at 2x speed that normal speed sounds wierd?
I love you so much for that Queen and David Bowie reference
Amazing description.
GENERALLY be PRECISE... isnt that an oxymoron?
Don't blink, you'll miss the video
Solutions do wierd things to freezing points. Most notably, salt water solutions have a lower freezing point, so salt is added to defrost the roads. With all the chemicals (alcohol, sugar, CO2) in beer, it's freezing point in a pressurised container is probably a lot lower than regular water, if it freezes after taking it out and opening it it's probably the Carbon Dioxide preventing it from forming a full big crystal that is beer ice.
Such a well supervised script.
2 Part Question:1) How come when I pull a beer out of the freezer and it's not yet frozen the can seems weaker, 2) How come it suddenly freezes after I take it out and open it. ( I call that a glacial)
Question! Lets say you had a mixture of salt, sand, and sugar. Then you followed these steps:
1) Add water (20ml) to the mixture and stir until dissolved.
2) Using a filter apparatus and a beaker, filter the salt/sugar solution from the sand.
Would there be any way to separate the salt from the sugar?
Please be very specific in your reply, thanks in advance!
+bluebirdlifestyle First evaporate water. Add ethanol to the salt and sugar then only the sugar will be dissolved in the ethanol. Put the solution in a fine sieve and u will get the solid salt on the sieve. Evaporate ethanol from the solution and u get the solid sugar!
I love this video and show it to all of my classes. Also, I love sushi. And Coke. The soda.
I was stubling across the internet and i came across a chem book that was banned for being to dangerous. If you want to find it look up the golden book of chemistry. It is not under copyright so there are free pdfs of it all over.
Question:: what causes a brain freeze? What is actually happening that makes it hurt? If you continued you drink something cold very fast and ignore the pain could it harm you?
There are nerves in your head that run close to the roof of your mouth that when they get cold, such as eating ice cream fast, send out a pain like signal. No ignoring this won't hurt you, it just won't be very pleasant.
Just press your thumb to the roof of your mouth to warm it up a little; that should stop it hurting.
Oh, I tried measuring carbon dioxide concentrations in soda by mass! If only I'd thought to use pressure, maybe my mentos rocket car would've performed better with a superior fuel...
Why stop at Physics. I would love for Hank to do a Crash-Course on all the sciences. Biology, Astronomy, Physics, Meteorology.
one of the best places to learn !!
Sci Show cover a very variety of scientific fields but it doesn't systematically teach you the important concepts you need to grasp for each subject, which is what Hank and John are doing with Crash Course. So there may very well be a Crash Course Physics in the future, although Hank once said that he may not be the best person to teach it.
it's 7:30am and i have my apchem mock exam in 3 1/2 hours thank u hank
+OAHall Ah the feels of college, at least it was a mock doe
u guys r having this stuff in college?? thts so cool ... we ovr here hav it in highskul :(
We have it in middle school :(
sabera tahseen so do we, and also in high school. It's all about how advanced it is!
qwerasd fix
qwerasd zucchini
qsertyasdfgzxcweettyusddfgzxc
Yay crash course ! dftba hank ... I love watching these
Thank you for captioning this video :)
LOL at the Harry Potter lightning bolt scar at 5:21
Hey Hank, Are you planning on doing a Crash-Course for Physics?
Mercury and Bowie ref? Nice.
We should *generally* be as *precise* as possible!
I think it's important to note though that the CO2 is also regulated by the equation
H2CO3 ---> H2O + CO2
I just adore crash course
Ahh, I can watch these at 1.25x speed, and it's actually the right information density to really enjoy them. I love this new variable video speed feature!
Original pressure in the can was 5 times atmospheric, so it's not a surprise that if it's released it expands about 5 times its original volume.
The intro made me breathe manually.
Video: *Explains everything*
Me: Can fish survive in seltzer water?
as a chem degree holder, i enjoy your videos alot. probably because i finally understand what smart guy is saying lol
I'm liking this just because he sang under pressure
LOL!! Dalton's got Harry Potter's scar!!
Harry Potter died a century ago.
Henry's law can also be expressed as s1/p1=s2/p2
I want more of Hank's singing!!!
hank is the best thank u hank
COOOOOL!!!!! These are excellently well made!!! Congratz :D
I like how the "cards" shake a bit.
I am currently watching this, the day before the AP Chemistry Exam, without any other form of "studying"
ha i bet youre in college now
Another common measurement for the ratio between solvent and solute is volume percent. You can see it on just about any bottle containing an alcoholic beverage.
Well, the little bit of the oil that might dissolve in the water and the little bit of water that might dissolve in the oil would be the solutes. But unmixed oil and water is neither.
Add some alcohol or soap, and you then can make a suspension, but that is completely another thing.
It would be interesting to see the ratio of people that associate the into to under pressure vs, ice ice baby.
Oxygen is O. O2 is how it appears naturally. because it bonds to itself. (unless you go up to the ozone layer where it's O3
It's like Nitrogen. Or Hydrogen.
Thank you so much! Your videos have helped me out so much!
neither. If neither are dissolved in the other then why would either be a solute? however if you add something like soap, which has a molecule with a long non-polar tail and a polar 'head' on the end, then what you get is called an emulsion.
DAVID BOWIE AND QUEEN!!! awesomeness
mass percent should be mass of solute/mass of solvent times 100 to give a %figure not times by 100%
that would give x percent percent ( you did say to be precise)
greart video for when your feeling down
Crash course biology would be good too!
that's because it's not really for you. I mean I assume that Hank would want you to enjoy it, but the whole point is that it is a "crash course," a quick run through of the subject.
Although thinking about it the bio ones I felt went a little more in depth, although maybe I just felt that way because I know more about chem than bio.
Can we basic Chem teachers get a video about saturation levels, please? As a lesson supplement...
So, I'm not sure Hank mentioned this or not, but for those of you who got super confused like I did, it turns out that the gas constant in the Ideal Gas Law changes when in a solution! That's why Hank's value for R is 0.08206 in this equation and not 8.3145. They also have different units; 0.08206 L atm/mol K and 8.3145 L kPa/mol K, I think it all depends on what unit of measurement you're using for Pressure? But I am not an expert, so if this is obvious I apologise, but it confused the hell outta me lol.
Have you done a crash course on Crimean War or is it in another video that you have done?