Gibbs free energy and spontaneity | Chemistry

Gibbs free energy and spontaneity | Chemistry | Khan Academy

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15 жыл бұрын

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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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Пікірлер: 150

@hamzie11 11 жыл бұрын

For my final exam i said the reaction was SPONTEAUS I am now repeating the subject

@samarthyadav4839 4 жыл бұрын

😂

@jenniferwang946 4 жыл бұрын

Oof 🤧

@knowledgechannelized5493 3 жыл бұрын

First of all .......Repeat this once again🤣🤣

@Vedicaa 2 жыл бұрын

Idk why this is so funny😂😭

@leenthebeenbag 10 жыл бұрын

SPONTEOUS

@Jonathan-rf5cp 6 жыл бұрын

Sponteaus. lrn2spell.

@qwertyuiop-ke7fs 6 жыл бұрын

The Greek god of Entropy

@nichithcn7119 5 жыл бұрын

like that pole dance, lol

@vult07 3 жыл бұрын

Sponteous Spilatous

@xiaowenxu1505 5 жыл бұрын

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!

@luchis117 11 жыл бұрын

Spoteous sounds like a Greek Hero

@Upgradezz 4 жыл бұрын

😂

@GODintheface88 14 жыл бұрын

"imagine tryin to screwdrive something while runnin past it" haha amazing! totally using that someday

@Masrur111 8 жыл бұрын

Sal is the best!

@Sleduuschaya 14 жыл бұрын

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.

@108titan 7 жыл бұрын

thank you! I like how you realised how good your analogy is around the 11 minute mark

@clm4231 12 жыл бұрын

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.

@Metanoiance 11 жыл бұрын

pff... Who needs Campbridge or Harvard when you have the Khan Academy... You guys are the best! Brilliant and easy explanations! Makes learning FUN

@sciencenerd7639 2 жыл бұрын

Sal's way of explaining things is so awesome

@rebeccaliang8915 3 жыл бұрын

You linked so many things together for me in this 17 min!!! Thank you so much!

@ginoxxxx09 10 жыл бұрын

Excellent! in less than 20 min more understanding of thermodynamics than dozens of lectures

@stephensells6038 10 жыл бұрын

THANK YOU SO MUCH!!! This was extremely helpful

@hussam023 11 жыл бұрын

After 10 mints of this video suddenly whole thermodynamics made sense....gr8 intuitive video

@kavieyu2281 10 жыл бұрын

It is a good one and it makes things more clear! Thanks a lot!

@ar33z 13 жыл бұрын

You make me wanna do some videos of my own just to help others in the way this videos helps me, thank you :)

@Donaldbeebi 7 жыл бұрын

u made it intuitive for me, thanks

@joshuawalker8297 3 жыл бұрын

That was the best explanation of this concept I have ever seen.

@halitozgur6166 4 жыл бұрын

Thanks to your guts, I have finally understood what Gibbs free energy is.

@dextrart 8 жыл бұрын

amazing video and explanation, thank you so much!!

@mrqreeny 14 жыл бұрын

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!

@hatchedarea 14 жыл бұрын

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?

@ashsiddique 14 жыл бұрын

This really helped me, thanks!

@ar33z 13 жыл бұрын

You make me wanna do some vids of my own just to help people in the way this videos you help me! Thank you :)

@mollyclifford4087 Жыл бұрын

Ugh thank you so so so much!!!! Always the best and fun to watch!

@shix1Resolve 12 жыл бұрын

I spent a whole week of classes learning this stuff, still confused. but after 20mins of khan academy my brain just learnt it all.

@nahidsharmin 3 жыл бұрын

I second this 💖

@lEmiliee 7 жыл бұрын

aaaamazing video can't thank you enough

@sayantanghosh6714 2 жыл бұрын

Amazing explanations. Thank you!

@nishantdaima34 10 жыл бұрын

Thank U a lot.... Really..

@13250 14 жыл бұрын

Master, thanks man!!

@EclipZeMuzik 6 жыл бұрын

i really like this keep up the good work!

@kipling1957 6 жыл бұрын

Brilliant! Now I get it.

@Lilmystery21 2 жыл бұрын

Thanks you keep inspiring people and keep doing great things

@LannieCamper 7 жыл бұрын

Can you do a video on the graphs for these for the new Alevel syllabus please

@redemptous 14 жыл бұрын

Nice leisurely and clear explanation, thanks

@pratyushbadrinath3420 10 жыл бұрын

Thanks a lot. Really helped :D

@green_block 12 жыл бұрын

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.

@albadadkola3301 7 жыл бұрын

thanks a lot!

@manohartk 13 жыл бұрын

Awesome!! thanks..

@elizabethchung5285 7 жыл бұрын

THANK YOU

@MrTartaruga543 9 жыл бұрын

masterful explanation, thank you !!

@kagamer21 3 жыл бұрын

Thank you!

@dr.strange123 4 жыл бұрын

Helpful video.

@mijnkampvuur 12 жыл бұрын

very well explained!

@flowersbyellenoh9634 3 ай бұрын

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!

@cspower12 10 жыл бұрын

I have a bio mid-term coming up, thank you :) :) :)

@RImAPhan 12 жыл бұрын

thank you very much.

@Upgradezz 4 жыл бұрын

thank you

@ull893 12 жыл бұрын

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.!!

@Limitless306 4 жыл бұрын

brilliant

@umnonoob 10 жыл бұрын

God bless you

@sirixilus Жыл бұрын

golden video

@jenniferwang946 4 жыл бұрын

I wasn’t even a kindergartner when this video came out lol.

@ryandavis9455 8 жыл бұрын

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.

@Cokenijn 13 жыл бұрын

thanks!

@cptcabo 13 жыл бұрын

Nice

@chris082681 13 жыл бұрын

Definitely helped... good thing i'm not studying english. i think i would sponteausly fail.

@sarahfaress5957 6 жыл бұрын

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?

@sxyngel 12 жыл бұрын

very helpful video :O so easy to understand.. LOLs at the "magenta molecule part" (not pink ;p) gatta love brainy chemists

@rotivo99 4 жыл бұрын

why do we want the equation to be negative? 13:37

@jeanlucthomson2323 10 жыл бұрын

Does anyone else notice that the "Daily Statistics" shows huge spikes just before the exams? Seasonal trend, I wonder what it means?

@Myat-oh8iy 3 жыл бұрын

In delta G values - 35 kJ mol-1 and -12 kJ mol-1, which value is closer to equilibrium?

@shauryaverma2705 Жыл бұрын

❤️❤️

@drdoovey5425 11 жыл бұрын

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.

@NaturallyHigh 11 жыл бұрын

*I've used this in the Caribbean and the Netherlands.

@shauryaverma2705 Жыл бұрын

Legend

@DragonAbyssal 12 жыл бұрын

I would probably find this easier to follow if it weren't an assignment. XD

@vamsipothireddy2944 3 жыл бұрын

East or west kban academy is best😁😁

@johnmosheim Жыл бұрын

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?

@rddaos 14 жыл бұрын

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

@MissRichox 12 жыл бұрын

this guy has more degrees than i have fingers yet he cant spell spontaneous. he's my type of man alright.

@JohnHorak 11 жыл бұрын

Absolutely. Just not for spelling :)

@christopherfanger9826 6 жыл бұрын

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.

@hatchedarea 14 жыл бұрын

@natymed360 Thanks for your answer. Actually, my sister typed up that comment, I'll be sure to pass your answer on to her.

@idster7 14 жыл бұрын

@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.

@markpankiw5430 7 жыл бұрын

Which videos precede this one ??

@VinceW271 10 жыл бұрын

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

@aniyeats 13 жыл бұрын

@leftgirl92 ya that's why he corrected it...

@hrishikeshbhadke5373 7 жыл бұрын

aniyeats hi

@rafaelblancovillafane3967 3 жыл бұрын

What software do they use as a blackboard?

@caramelbutterfli 12 жыл бұрын

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.

@yukiibeauty07 11 жыл бұрын

and UK history!

@rddaos 14 жыл бұрын

If nobody mentions to him that he's taking 30 minutes to provide 2 minutes of information, then how will he know to improve?

@mackinnon182 14 жыл бұрын

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?

@surfrgrlsophia 13 жыл бұрын

I was wondering why it's called Free energy?

@child9125 2 жыл бұрын

Gib me free energy sigh

@satriowibowo3412 4 жыл бұрын

Satrio present :)

@nikvenkata 12 жыл бұрын

@jsanford01 wrong "peace", and wrong prize :p

@jenniferwang946 4 жыл бұрын

Anyone here for AP bio on khan academy?

@thebourneishere 11 жыл бұрын

peace

@jondoe9581 5 жыл бұрын

PHOENIX LIGHTS = free energy

@nirvanaurantian6834 6 жыл бұрын

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?

@mrmust2780 3 жыл бұрын

How many people are watching this video 2021?

@sidneydean. 14 жыл бұрын

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.