You forgot to mention that -delta(G) is spontaneous in the FORWARD direction. Positive delta(G) is essentially saying spontaneous in the reverse direction.
defining entropy as disorder is actually misleading. Entropy isn't really about disorder or chaos, but rather becoming equilibrium with the environment. A great example is a drop of ink into a clear glass of water. The ink drop can be best described as trying to become equilibrium in concentration with the glass of water instead of becoming more chaotic. Because after the equilibrium has been reached, "chaotic" process sort of dies out.
-232kj - 37.7= -269.7 not -232kj -37.7kj = 194.3. The video is good overall. He did not carry a thick accent in which I could not have understand her. over all she is a wonderful public speaker.
@WHY70122 Thanks for your nice words. If you go to Brightstorm site, you can find videos for your topic much conveniently. You can search with keywords, browse by topic, or even use your textbook page to find related videos.
I very like the instructor.....but i think she made a mistake with units of delta S as it is in Joules....either a typo or she should have converted to KJ.
I agree that there is an error. However, I believe it may have been with the initial units. I think the -118.0 should have been kJ instead of just J. If you convert to kJ the temperature is extermely high at 7528K which makes the reaction non-spontaneous.
It was not a matter of unit was the problem. The problem that she was having is in algebra. What was confusing is that she could have done the problem in joules and then converted to kilojoules, so that viewers would not have gotten confused with the K values.
This is very helpful, but i have a questionIn, the last problem, how did u know that temperature is in Kelvin, not Celsius? Because all the given data didn't specify what unit the temperature in
It's a shame TH-cam doesn't have a slowdown speed for 0.75 because I think that would be perfect for this video. I personally like that she's talking fast because the video doesn't drag on and I get what I need to know fast rather than skipping through it, but for people who want her to be slow, the 0.75 feature would allow students to listen to her at normal speed. Great prof and great video!
every thing is good but my only question is : at the final example the unit is ( kj /mol ) din't we have to change it to (kj/k) ???? i din't know but Im felling that there is some thing wrong with the units
I am confused why is it that if it is not spontaneous it is suddenly a bad thing? I have not heard of that before. Could someone please explain? Or is it just a way of saying they are two very separate things. I figure spontaneous things such as flammable objects would be considered bad, not the other way around. Any help would rock thank you :)
"should be in Kelvin... can also be in Celsius." I'm like 80% sure it needs to be an absolute scale so I don't think Celsius would work... maybe the Rankine scale?
@brightstorm2 at 3:20 did you do that math in your head if so where did you learn to day math like that in your head I am a fairly intelligent person and it took me about 3x as long to do that.
Superb. Could this be used to derive the Nernst equation in electrochemistry as referred by you at the start of the lecture. There is a lecturer who has explained this, but he conveniently assumed the Gibbs free energy equation to jump to the Nernst equation without the intervening explanation.
Hi how can i explain surface tension by thermodynamic analysis using gibbs equation such as surface exess and area occupied per molecule at the interface
thanks madam. first time very hard this topic Gibbs free energy..... but now Gibbs free energy easily topic thermodynamic chapter...but one problem this topic Ellinghans Diagram.......
Great video. She's a great teacher (hot too) and really puts things in a way that makes you listen and understand. A small mistake in the calculation can be forgiven, she's taught the principle Ian. Simple way. Thank you
Although I think this videos are really helpful (mostly because I can pay more attention when its not 8 in the morning), they have the same problem as my normal chemistry lessons in that they don't conceptually teach anything, they just show you how to do the problems. Instead of just saying that we want temp to be high when the reaction was endothermic and the change in entropy was positive, explain why thats the case. Its useless to know this stuff if you cant apply it outside of the class.
Entropy increased ? "Thats good, we like disorder" Increased from what? It is 138 J/K is an increase from what?? And why is every explanation missing vital info.( especially my class).
Is there any button more than 5 stars :) ************* ive made it though :D i agree with someone above that u gotta slow down a bit . Cuz this is one of the most difficult part in chem 2 i guess. I have my own favourite channels that help me with chem but for this problem...i never find those useful except this one. Thanks a lot for uploading this. And if u have time plz label ur vids with more specified details so we dont get messed trying to search ur vids...cuz before i came up with this...
Add a short sentence to the tail of each labels mentioning " I;m gonna teach fast and whoever bothers can pls shut ther traps and stay away from the video ".......well taught :D !!!
Despite the calc errors, this was very helpful. Thx.
Could you check the entropy value -118.0 j/mol, in the sample you used 118 kJ instead of J/K.
Good job though, I really enjoy your videos.
it should be 232Kj- - (273Kj X0.138 kj/K)
Best description ever. Logical, calm explanation.
nice vid imo :)
btw the units of the ∆S should be J/K near the end .. i think
Thank you for explaining such a difficult topic so clearly ..Makes life easier..
Wait a sec... the answer should be " -232 -37.7 = -269.7". Why did she subtract??
Math Error.
You forgot to mention that -delta(G) is spontaneous in the FORWARD direction. Positive delta(G) is essentially saying spontaneous in the reverse direction.
defining entropy as disorder is actually misleading. Entropy isn't really about disorder or chaos, but rather becoming equilibrium with the environment. A great example is a drop of ink into a clear glass of water. The ink drop can be best described as trying to become equilibrium in concentration with the glass of water instead of becoming more chaotic. Because after the equilibrium has been reached, "chaotic" process sort of dies out.
Youre like a genius chemistry guru--thanks for helping me get that A
Literally this video and the khan academy video helped me understand this better. Thank god this video exists during the pandemic lol.
This was not just helpful.. It was really great!
-232kj - 37.7= -269.7 not -232kj -37.7kj = 194.3. The video is good overall. He did not carry a thick accent in which I could not have understand her. over all she is a wonderful public speaker.
@WHY70122 Thanks for your nice words. If you go to Brightstorm site, you can find videos for your topic much conveniently. You can search with keywords, browse by topic, or even use your textbook page to find related videos.
Something about the way you teach makes me understand. YAY!
I very like the instructor.....but i think she made a mistake with units of delta S as it is in Joules....either a typo or she should have converted to KJ.
I agree that there is an error. However, I believe it may have been with the initial units. I think the -118.0 should have been kJ instead of just J. If you convert to kJ the temperature is extermely high at 7528K which makes the reaction non-spontaneous.
I love this video and the teacher who is teaching.
You and the really enthusiastic physics guy are my favourite
Omg thank you! I finally understand.
how y guys can make such a diff topic a cakewalk? loved it !
@ 3:30 how does -232kj - 37.7kj = -194.3kj ? shouldn't it be -269.7kj?
It's supposed to be -232 kJ - (-37.7 kJ) = -232 kJ + 37.7 kJ = -194.3 kJ.
The final answer is correct, she just wrote the sign wrong.
StarFox008 no the entropy and the Temp are both positive, in the eq they become negative, so yes 267 is right
It was not a matter of unit was the problem. The problem that she was having is in algebra. What was confusing is that she could have done the problem in joules and then converted to kilojoules, so that viewers would not have gotten confused with the K values.
@Cramerica66 It's not bad, just a way of differentiating. By "bad" we mean "unable to proceed in the forward reaction". Hope this helps :).
What is your definition of "good" and "not good"?
did I read it well? at the 2nd problem she calculated KJ with Joules then the way how she finds T is not right either.
These videos are helpful, but I like the physics guy more. He's the best.
I am not bragging, I am just shocked how ahead our Canadian curricula is ahead of the United States.
You are wrong. The equation is
888.3 kJ/mol= T (118.0 kJ/K)
T = 888.3/118.0 = 7.53
why the standard temperature is 273K? should be 298 K right?
Om last question why nt just do T = delta H / delta S , much quicker
So good explanation!
i wish shes my teacher! she can teach way better than my teacher. thank you so much!
Great explanation - thank you.
Really helped. Thanks a lot!
Thank you.dont worry about your talking speed I can replay it anytime :)
This is very helpful, but i have a questionIn, the last problem, how did u know that temperature is in Kelvin, not Celsius? Because all the given data didn't specify what unit the temperature in
Excelent. Very clear, and quick!!
seems to be having a problem reading what you or someone else wrote via speed talking. Thanks for the help though.
Thanks for making this video
It's a shame TH-cam doesn't have a slowdown speed for 0.75 because I think that would be perfect for this video. I personally like that she's talking fast because the video doesn't drag on and I get what I need to know fast rather than skipping through it, but for people who want her to be slow, the 0.75 feature would allow students to listen to her at normal speed. Great prof and great video!
every thing is good
but my only question is :
at the final example the unit is ( kj /mol ) din't we have to change it to (kj/k) ????
i din't know but Im felling that there is some thing wrong with the units
I am confused why is it that if it is not spontaneous it is suddenly a bad thing? I have not heard of that before. Could someone please explain? Or is it just a way of saying they are two very separate things. I figure spontaneous things such as flammable objects would be considered bad, not the other way around. Any help would rock thank you :)
"should be in Kelvin... can also be in Celsius." I'm like 80% sure it needs to be an absolute scale so I don't think Celsius would work... maybe the Rankine scale?
@brightstorm2 at 3:20 did you do that math in your head if so where did you learn to day math like that in your head I am a fairly intelligent person and it took me about 3x as long to do that.
what happened to the negative sign next to the temp
888.3= -T +118 kj
888.3-118= -T
7.53 = -T
so T = -7.53 !!!
thank you
very helpfull...Thanks alot
very helpful
That's what I got too. I don't follow that detail.
@1006Will Good thing she's super articulate :)
Is Gibb's free energy concept useful only to predict feasibility for chemical reactions? Any other use in mechanical engineering?
You did not unified the unites of enthalpy and entropy
how come your entropy is in the form of kJ? shouldn't it be in J/mol.K?
Wouldn't you have to convert DS to be in KJ/mol? otherwise it would not cancel out.
thanks
she speaks fine. stop complaining guys you could always replay the parts you missed.
Patrick Ante I know right?! I don't understand all the complaining
Wow, is this really university stuff? I did this for a grade 11 chemistry project, too bad I did not find this before then.
really helpful 💜
Isn't -232-37.7= -269.7? Math error?
True... She subtracted 'em.
Math Error.
Yep
U forgot to change 118 j/mols into Kj so it shud have been i believe .0118kj/mol
Actually .118 but you're right. Haha, great video just forgot to check for the KJ and J conversions on the last few steps.
Superb. Could this be used to derive the Nernst equation in electrochemistry as referred by you at the start of the lecture. There is a lecturer who has explained this, but he conveniently assumed the Gibbs free energy equation to jump to the Nernst equation without the intervening explanation.
Don't get tensed nobody behind you
Thank you so much
Hi how can i explain surface tension by thermodynamic analysis using gibbs equation such as surface exess and area occupied per molecule at the interface
wow thank you sooo sooo much!!!!!
She made two mistakes. -232 - 37.7 = -269.7 and it should be .118kJ/K in the last problem...
nice explanation....
Awesome!!! Thanksss!!!
thanks madam. first time very hard this topic Gibbs free energy..... but now Gibbs free energy easily topic thermodynamic chapter...but one problem this topic Ellinghans Diagram.......
Great video. She's a great teacher (hot too) and really puts things in a way that makes you listen and understand. A small mistake in the calculation can be forgiven, she's taught the principle Ian. Simple way. Thank you
mam please upload about spectoscopy
she didnt convert J of Delta S to KJ.
Describing entropy as "disorder" is still confusing to me
LIKE....thanks..u made my life easy
So helpful, but try to slow down.
Great video but please slow down!!!!!! I do have unlimited data which means your video can last 30 seconds longer and be tons more understandable.
Although I think this videos are really helpful (mostly because I can pay more attention when its not 8 in the morning), they have the same problem as my normal chemistry lessons in that they don't conceptually teach anything, they just show you how to do the problems. Instead of just saying that we want temp to be high when the reaction was endothermic and the change in entropy was positive, explain why thats the case. Its useless to know this stuff if you cant apply it outside of the class.
it looks like she is explaining in a mathematical way....look at her at 5:59
Please slow down
Everyone taking the class is not necessarily a science major or good in it. No need to brag.
I also like this
that is why there is a pause button
Math and Science teachers that "Don't Suck!" Haha!
thanks your videos are good :) but you do kinda make a few mistakes - maybe watch it through before you upload it to make sure its right??
U speak very fast
r u on 2x speed?
I am *s p e e d*
for everyone saying she's too fast: put the video at 0.75x speed lol
yes...she made a mistake reaction temp.. 7-8 K....r u kidding me?
unify*
Entropy increased ? "Thats good, we like disorder" Increased from what? It is 138 J/K is an increase from what?? And why is every explanation missing vital info.( especially my class).
you are blessed, I am so thankful
Is there any button more than 5 stars :)
************* ive made it though :D i agree with someone above that u gotta slow down a bit . Cuz this is one of the most difficult part in chem 2 i guess. I have my own favourite channels that help me with chem but for this problem...i never find those useful except this one. Thanks a lot for uploading this. And if u have time plz label ur vids with more specified details so we dont get messed trying to search ur vids...cuz before i came up with this...
this only scratched the surface of it need hard problems wrt more thermodynamics
1:52 "the nutellas"
please slow down pleasssssss, thank you
which potato did you record this video with?
Tnks and I found ^G as -269.674 kj/mol
Add a short sentence to the tail of each labels mentioning " I;m gonna teach fast and whoever bothers can pls shut ther traps and stay away from the video ".......well taught :D !!!
She is left handed!!
Too many mathematical mistakes... Pay attention to your units and the negative signs
ooooooo.. thats not good. I read this during the commercial. I dont know now.
your are teaching god