15.2/R1.4.1 Predict the entropy change for a given reaction or process [HL IB Chemistry]

Remember that ENTROPY can also be thought of as DISORDER. Gas has the highest entropy in IB chemistry, so any reaction that produces gas will have a positive value of delta S, whereas any reaction that uses up gas will have a negative delta S. This is an oversimplification, e.g. what happens if both product and reactants are gaseous -- watch the vid!

[@Vamrekisses68]

almost 5 years later... this video is still helping people out. thank you so much! it simplified everything and made it so much easier to understand!!!

[@silentd5438]

SAME

[@janekth1655]

8 years later... this video is still helping people 🙃

[@simpleqaseem1655]

10 years I watched it now anyways great video !

[@aquazr5345]

11 years still helpful

[@3m_tt759]

6 years later and and there are still people relying on this video for help (I'm one of them)

[@samuelhernandez397]

upvoted because of the end

[@ibchemvids]

Glad you are finding them helpful. I understand that chemistry can be hard to "love" (shhh I prefer physics). Don't forget to practice past papers too - if you do the last 8 or so then the exam should hold no surprises. Get hold of the official IB answers too if you can. Good luck and mail me when you get your results!

[@sanoosho9258]

Iam watching this video in 2023.Its still helping me with chemistry ❤

[@set_n]

A decade later! Still helping students out :D This video was sooo helpful, and your super funny XD THANK YOU

[@ibchemvids]

Glad I could help! A decade eh, I lost my lovely blonde hair in that time, I should have made more cameos in the vids!

[@minakshimamteam7071]

8 years and still helpful

[@talalnadeem3981]

Almost 10 years but this video is still helpful.

[@kashishchugh5637]

I am watching this video in 2019. Its still helping me with chemistry. He has explained everything in just 3 mins . Love from india 🇮🇳

[@monkeyplayer1]

8 years later and still helping people. Wonderful how the internet can be used for good.

[@harshrana8210]

U don't know but your video after 8 years is still proves worthy for me

[@ibchemvids]

hehe - i have to look at some of the old vids too if i forget the material!

[@Pandaonfire5]

Thank you for explaining in such simplicity!

[@karimanur4675]

By far the absolute best straight forward explanation. I can't wait to see the rest of your videos. Your students are very lucky!

[@georginaburrows]

thanks dude you taught me more than my chem 116 professor ever did lmao

[@ibchemvids]

+Cecilia B de nada dudette!

[@ibchemvids]

Good luck if you have the exams in May 2013. I lived in the middle east for 3 years and loved it out there.

[@hierapresmidi]

You are making my revision so much more bearable... bordering on fun! I LOVE the videos, as I find I can take in a lot more info than when I just copy out notes from my revision guide. Thank you SO MUCH!! Hopefully with this i'll be able to get my HL 6 ... :D

[@triniren9584]

Watching in 2019, and El Diablo hehehe made it 10X BETTER! 😂 😂 😂

[@alisaain7284]

Damn I've got my A2 Exams in June and I've still got so much to cover because I missed a lot of online lessons, entropy was one of the harder ones, this definitely has helped massively thank you so much sir

[@alkdraa101]

I don't know how to thank you seriously .. am revising by reading the book and then watch your vids ... I just wanted to say thank you .. best regards from Baghdad :)

[@arifmmm1]

Thank you!!! It really helped me a lot...

[@flashpeterson722]

Absolutely amazing explanation! Thank you! :)

[@aban33]

Heh heh heh. Heh heh heh. Heh heh heh heh heh heh heh!

[@shyamsingh727]

Suprb explanation thanks

[@rakshitharaj2751]

Though so old it helped me a lot,thnk u...

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How the heck could anyone dislike this video

[@KrishnaHattoriShow]

Love from India! Nice Explanation

[@anjaliprajapati2162]

This is so sweet..... thanks for this..this video is helpful💙✌..

[@entertainment.3325]

Got The concept of entropy thanks u sir

[@randeepsingh7575]

thanx u help me a lot

[@najmahassan3651]

thank you soo sooo much.. the only reason i'm still in this class is you... no honestly though, my teacher is an idiot, i swear he can't write 'bum' on a wall... i envy your students.. thanks

[@ibchemvids]

cheers!

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the end was the best 😂😂😂

[@chris_o41]

my chem ib hl test is tuesday, im freaking out haha luckly these videos are helping me

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Can you please be my chemistry teacher I love your way of teaching you’re just so helpful AAAH

[@annika7723]

thank you mr thornley :)

[@lauraharrel8073]

Great video! Super helpful! Thank you for taking the time to make it! : )

[@catzztac]

This was very helpful, thank you!

[@Capt-Yack-Sparrow]

Just the review i was looking for, thanks! LOL @ the little diablo at the end haha!

[@q_q123]

Thanks this helped a lot. I love the end

[@cristeena1321]

Excellent explanation sir🔥🔥🔥

[@adichatterjee]

damn here in 2021. thank you!

[@evelynnwang9658]

Thank you so much for saving my ass before my quiz!!!! You did a much better job explaining this than my professor🤣

[@partiyushHW]

after 11 yrs stiillll on top reccomente d

[@raxjana3509]

omg thankyou soo much this helped faaar better to undrestand somthing that was making my head swim

[@eljurdiaj1]

thank you very much! you do a great job explaining

[@emreo.9196]

the diablo thing was pretty cool :)

[@Dina-fx8rs]

This was very helpful. Thank you!!

[@ibchemvids]

@drmariawaris Hi, P1 and P2 vids would get the IB on my case and they would shut down my site - they are very protective of their questions (they sell them you see!)
I agree it would be useful AND I could make my own versions of the questions BUT the plug may get pulled on this project in a week or two by my school :(
Glad you find the vids helpful
RT

[@socialistguerrilla773]

CuS(s)+O2(g)--->Cu(s)+SO2(g).......how am i supposed to predict this? pretty sure professor doesnt want me to put that its 0. Maybe because SO2 has more bonds formed thus its more stable than O2 BUT CU lost a bond so its less stable than before...really dunno

[@letienquangc4037]

Hey. That is such an interesting question you have posed. So I luckily found the possible answer.
personal.tcu.edu/thanna/10125/Quizzes/Exam312key.pdf
In this PDF, at page 3 there is your concerned reaction and its entropy change also. From I what read, at standard conditions, your reaction will have a highly negative Delta Gibbs. Please read the PDF for more info.

[@letienquangc4037]

Disclaimer: The PDF is not my work. Almost forgot. :)

[@the1091man]

awesome video..... tremendous help

[@Mr_wolf162]

❤thanks man

[@orbitzen5343]

This saved me plenty of time

[@trggaming6390]

the video is very good
love from India

[@leenmaher2641]

Life saver

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First of all your videos have saved my life and secondly how do you know that ethanol mixed with water makes an aqueous solution?

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Mimi Mustapha aqueous means mixed with water! = vodka

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+Richard Thornley hahahahahaha best explanation ever

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Its very helful...🔥🔥🔥

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Thank you so much!!! You save me

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Wonderful

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thank you so much for this! my teacher is a bum and cant teach ): i am surviving because of you. and the accent makes everything that much more enjoyable(:

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This helped me a lot! Thank you :) loved the ending, made me laugh, I needed that #studying chemistry

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The end part was hilarious xD

[@fehimaa1609]

Tnx our teacher

[@beingbhartisharma]

Thankyou

[@mayahadzic7001]

I’m a little confused, I was practicing along with you in the video and you wrote the entropy change for methanol as 240, but when I look at it in the data booklet it’s 127. I could be wrong but I think you confused the entropy and the enthalpy change of formation? Because that number is 240.

[@ibchemvids]

Methanol is not in this video. Either it is another vid (can you tell me which one) or another guy!

[@mayahadzic7001]

Richard Thornley oops, I meant to comment this under the video titled “calculate the standard entropy change for a reaction.” I looked back at those comments and it seems like some other people noticed it as well

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[@Azza_00022]

Thank you so much😊

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Thank you :”>

[@51gokulmohanom84]

Thank you sir

[@kroko8916]

super helpful!

[@cosainaliyahm.8373]

The diablo part is cute

[@ivycircle]

Thank you
This is helpful for Nmat right?

[@FRESHawele]

this was on the 2008 IB Chemistry SL exam

[@lolochan6645]

Hahaha XD
Thank u very much~

[@jintan8112]

You sound like a gamer (I spent 100 days on minecraft hardcore) XD

[@ibchemvids]

I wish I picked up a guitar instead of a joystick 42 years ago.

[@camronmckinney5826]

More moles means more entropy

[@sabinahasanova7198]

Thank you@

[@ibchemvids]

no probs.

[@chandrabeixon7299]

and how to determine spontanoeus from there? pls help

[@sds3841]

If u have an endothermic reaction (delta H is positive) like H2 + I2 --> 2HI can you say whether the entropy rises or decreases and whether the reaction could be spontaneous?

[@ibchemvids]

entropy change (in IB) is determined by the creation/removal of gas products. If more gas is produced than reacted, then entropy increases and delta S is positive.
If the reaction is ENDO and entropy is DECREASED then the reaction cannot happen.
Use deltaG = deltaH-TDeltaS to determine these outcomes.

[@ivannapacatan3233]

Sir, what if both reactants and products have the same number of mol? Does entropy increase or decrease?

[@ibchemvids]

If the moles of gas are the same on each side of the equation, then entropy change is about zero. Actual values for entropy are in the data booklet.

[@savanamoon107104]

Thank you. This was really fucking helpful.

[@rolandobeso2103]

Thanks ! chemistry made easier!

[@BluRingC]

Okay so delta S can also be delta H

[@ibchemvids]

You can calculate both by using products - reactants values. But entropy is not enthalpy.

[@sivenathijuqu9973]

thank u

[@kanivakil198]

Examples at 1:13

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