Gibbs free energy and spontaneity | Chemistry | Khan Academy
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- Опубликовано: 14 окт 2024
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Intuition behind why spontaneity is driven by enthalpy, entropy and temperature. Introduction to Gibbs free energy. Created by Sal Khan.
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Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.
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For my final exam i said the reaction was SPONTEAUS
I am now repeating the subject
😂
Oof 🤧
First of all .......Repeat this once again🤣🤣
Idk why this is so funny😂😭
It is just amazing!I never knew before where the energy released or absorbed by the reaction come from.I never knew why T is involved in calculating gibbs free energy.Thank you so much!
SPONTEOUS
Sponteaus. lrn2spell.
The Greek god of Entropy
like that pole dance, lol
Sponteous Spilatous
Gee people. Don't like it don't watch it. What can be slow for some is just the right pace for others.
You want speedy stream of information? Go sit at the lectures in college. Or better yet, grab a text book and start "understanding at your own speed" instead of wasting your time critiquing somebody's charitable work.
I am, for one, am very grateful for somebody who TOOK THEIR TIME and reiterated the information in a simple and a non-pompous way.
Sal is the best!
thank you! I like how you realised how good your analogy is around the 11 minute mark
Thanks Sal Khan, with your help I will be able to finish my medical program and eventually I will be able to help thousands of patients.
"imagine tryin to screwdrive something while runnin past it"
haha amazing! totally using that someday
pff... Who needs Campbridge or Harvard when you have the Khan Academy... You guys are the best! Brilliant and easy explanations! Makes learning FUN
Excellent! in less than 20 min more understanding of thermodynamics than dozens of lectures
Sal's way of explaining things is so awesome
Spoteous sounds like a Greek Hero
😂
And from that day off, I started to understand 'Gibbs free energy'...
This explenation definitely blew away all my questions about this topic :D
Thnx!
You make me wanna do some videos of my own just to help others in the way this videos helps me, thank you :)
After 10 mints of this video suddenly whole thermodynamics made sense....gr8 intuitive video
You linked so many things together for me in this 17 min!!! Thank you so much!
THANK YOU SO MUCH!!! This was extremely helpful
That was the best explanation of this concept I have ever seen.
No Way. You can't compare that with Khan's video. That is just explaining how to do the math which has no need to explain. Even a 5th grader know how to do that!! On the other hand Khan's video helps us building intuitions on how things actually works. He explained the physical meaning of each and every properties. Finally, if you don't wanna learn more than a fifth grader but wanna pass the exams of your high school or university then you don't need to watch Khan's videos.
I spent a whole week of classes learning this stuff, still confused. but after 20mins of khan academy my brain just learnt it all.
I second this 💖
Could you explain why in an endothermic reaction with positive entropy, the rxn is spontaneous when the temperature is high? I understand it mathematically but if you can show or explain at the atomic/molecule level, I would really appreciate it!
Ugh thank you so so so much!!!! Always the best and fun to watch!
Thanks to your guts, I have finally understood what Gibbs free energy is.
It is a good one and it makes things more clear! Thanks a lot!
Can you do a video on the graphs for these for the new Alevel syllabus please
amazing video and explanation, thank you so much!!
but in chemistry its always drilled into our heads that the reason increased temperature increases reaction rate because it makes particles more likely to hit each other, it seems in contradiction with the analogy that increased temp will reduce the spontaniety of the reaction. Why would increased heat help out a reaction sometimes and not in others? Is this simple a problem with the explanation they give to students?
so at equilibrium (forward rate equals reverse rate so the reaction is still moving in both directions) and delta G = 0, does this mean that the reaction is spontaneous in both directions? delta G = 0 means that the free energy of the reactants equals the free energy of the products so the probability for the reaction to move in both direction (spontaneously) is equal? Can someone please chime in?
Thanks you keep inspiring people and keep doing great things
u made it intuitive for me, thanks
Thank U a lot....
Really..
This is le chatelier: When heat is a product (exothermic), high temperature will shift the reaction toward the reactants and low temperature will shift the reaction toward the products. When heat is a reactant (endothermic), high temperature will shift the reaction toward the products and low temperature will shift the reaction toward the reactants.
In delta G values - 35 kJ mol-1 and -12 kJ mol-1, which value is closer to equilibrium?
Khan says, I feel pretty good about this equation. I agree with you Mr. Khan. Are u related to Salman Khan the actor anyway?? You are awesome...You are the avatar who is born to revolutionise the education system of this world.!!
Helpful video.
Amazing explanations. Thank you!
thanks a lot!
Thank you!
Nice leisurely and clear explanation, thanks
brilliant
*I've used this in the Caribbean and the Netherlands.
Master, thanks man!!
aaaamazing video can't thank you enough
Awesome!! thanks..
Yeah, I am aware decimals are above zero :P ... I was just pointing out that it could seem confusing to other people. I'm just talking in terms of explaining, It would be more simple to just say positive or negative, which are the agreed when dealing with the sign for energy. Just to be clear, I wasn't the one confused. I'm a chemistry tutor, and sometimes my students ask that exact question (albeit out of a bit of stupidity), but they are the ones who do get confused, and it doesn't help.
If g=0, and I do DH=DS*T, and then T= DH/DS=T, T can be negative, is that possible? What does that Temp represent?
Brilliant! Now I get it.
thank you
i really like this keep up the good work!
thank you very much.
THANK YOU
why do we want the equation to be negative? 13:37
This really helped me, thanks!
I wasn’t even a kindergartner when this video came out lol.
Cosider the Reaction: 2Hg) (s) --> 2Hg (l) + O2 (g)
Bond:
Hg=O 340kJ/mol
O=O 498 kJ/mol
How do i solve this?
My answer was exothermic but it was wrong. It should be endothermic.
This is how i solved it:
Enthalpy Before: 2(340) = 680
Enthalpy After: 498
Change in Enthalpy: 498 - 680= -182
Therefore, the reaction is exothermic because energy is released from the bond.
Can you please tell me what i did wrong and how to solve it.
Thank You
golden video
very well explained!
Thanks a lot. Really helped :D
❤️❤️
@natymed360 Thanks for your answer. Actually, my sister typed up that comment, I'll be sure to pass your answer on to her.
i don't understand how in example 2 the second state is less entropic that the first. The first look like elements and the second a compound. Is the element more orderly? Or is that not important in terms of the demo?
@rddaos he's made hundreds of videos. he probably doesn't have time to rehearse before every one of them. these lectures IMO are better at illustrating concepts than any i've seen on the internet. and they are free. so you have no grounds for argument.
I have a bio mid-term coming up, thank you :) :) :)
Does anyone else notice that the "Daily Statistics" shows huge spikes just before the exams?
Seasonal trend, I wonder what it means?
What software do they use as a blackboard?
He doesn't need to script every sentence, he just needs some notes so that he doesn't spend 30 minutes rambling to himself without presenting more than 30 seconds of information. But i suppose dummies can't absorb more than 30 seconds of information per 1/2 hour
Something that upsets me is how readily really smart scientists confuse mathematical probability with realistic possibility. Just because something is mathematically probable in a current mathematical conception of the universe does not mean that it correlates AT ALL to the realistic possibility of that outcome. To assume that it does would be to assume that our mathematical conceptions correlate perfectly with the world, that our math is a literal, perfect description of whats going on around us. But if it is that then why does it keep getting updated? Probability does not necessarily equal possibility, because the equation you're creating probability out of is not perfectly representative of the material universe.
tl;dr - no its likely not possible that an egg could spontaneously generate itself from nothing.
If Im wrong prove it to me.
This makes no sense. H2 + O2 + activation energy = H2O −286 kJ/mol. Thermodynamics taught and applied to chemical reactions? Na and CL come within 0.94 to 0.23 nm what happens?
God bless you
Legend
Definitely helped... good thing i'm not studying english. i think i would sponteausly fail.
@leftgirl92
ya that's why he corrected it...
aniyeats hi
very helpful video :O so easy to understand.. LOLs at the "magenta molecule part" (not pink ;p) gatta love brainy chemists
Nice
Which videos precede this one ??
Im struggling with how to find delta g for reactions with different temperatures. i know the equations but its not giving me a delta s or delta h. It just gives me an equation like
2NO(g)+O2(g)--->2NO2(g) at a temp of 715k and sayd find delta g. I dont understand how to relate delta g to the temperature.
Absolutely. Just not for spelling :)
East or west kban academy is best😁😁
I disagree, if you want that sort of thing then watching your professor throw stuff on board is more fit for you. Hearing Sal think out loud as he goes along really helps people understand the information.
Satrio present :)
If nobody mentions to him that he's taking 30 minutes to provide 2 minutes of information, then how will he know to improve?
this guy has more degrees than i have fingers yet he cant spell spontaneous. he's my type of man alright.
I would probably find this easier to follow if it weren't an assignment. XD
@jsanford01 wrong "peace", and wrong prize :p
I was wondering why it's called Free energy?
and UK history!
PHOENIX LIGHTS = free energy
I have many problems about electrochemistry, can someone notice me? Help meee
saying delta H is < 0 is confusing... someone could misinterpret that as meaning a decimal, even though you mean a negative value....
Gib me free energy sigh
Plz tell me the name of teacher plzzz plzzzz
How many people are watching this video 2021?
peace.
"Sponteous" lol great video
Anyone here for AP bio on khan academy?
Marry Me?
ooooook lets not get bent bucko
Piece hehe it should be peace.
good video, but you make your "N's" backwards. this was actually distracting :/
spouteaus