Enthalpy of Reaction

053 - Enthalpy of Reaction
In this video Paul Andersen explains how the enthalpy of a reaction can be released in an exothermic or consumed in an endothermic reaction. According to Hess's law if the reaction is reversed the sign of the enthalpy of reaction is also reversed. The overall enthalpy of reaction is the sum of all the individual reactions. A couple of enthalpy of reaction problems are worked out as well.
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Music Attribution
Title: String Theory
Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
Dnn87. Pieces of Lithium Metal from the Dennis S.k Collection, 12/12-07. Self-photographed. commons.wikimed....
"File:AlfredNobel Adjusted.jpg." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.or....
"File:Dynamite-5.svg." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.or....
"File:Hess Germain Henri.jpg." Wikipedia, the Free Encyclopedia. Accessed December 22, 2013. en.wikipedia.or....
"File:Nitroglycerin-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.or....
"File:ThermiteReaction.jpg." Wikipedia, the Free Encyclopedia, December 11, 2013. en.wikipedia.or....
Haacken, User: Herbert. English: Instant Cold Pack, March 15, 2012. Own work: Herbert Haacken. commons.wikimed....
V1adis1av. Single Crystal of Lithium Fluoride, LiF, in a Beaker with Water, March 20, 2008. Own work. commons.wikimed....

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samnoname2010 he dropped out

[@jenspetter1454]

?? so did you give half of it?

[@winterhuff1338]

This helped me so much . I’ve been watching a bunch of videos on this but I couldn’t understand them .i understand this very much .thank you

[@AyoItzMat]

Excellent video, very concise.

[@oogalook]

Thanks for the great video! Very helpful.

[@philippebouchard9093]

Little mistake during the 4th minute. The target should be O2 (g) and not O2 (s)
Very good video however. Thanks a lot

[@sungminpark8467]

thank you so much!! I can understand now!

[@mitshah2162]

Best

[@ethanxu8013]

The last answer is wrong

[@nicolefurze688]

some people say that teachers teach because they cannot do. that is a complete lie. teaching is an art and a gift. this man in the video has that gift and gives his art generously. most of my professors in college do not possess this gift of teaching because they are not aware that teaching is something outside of just being able to do what it is they "teach". and thus, they do not deserve the money i spend on tuition, but mr. anderson does.

[@vog-]

Very true, only a few teachers I’ve had could actually teach in such a way

[@alyssahoffman8855]

I like this more than Khan Academy

[@jennycarnie7804]

Lol I saw your comment on Khan academy's video and found this. Thanks.

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of course (;

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Lol Hoffman reaction

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Alyssa Hoffman agreed

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Me too👍

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you are a very good teacher. you deserve 1 million more subscribers .

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Your wish came true

[@Angie-no7qx]

Did not want to keep asking my teacher for help on this since she got annoyed so I went to this video and saved me thanks

[@liammarie1447]

I literally shed a tear because of this 😂 thank you

[@tanyay1073]

Thanks for making chemistry a little more bearable! 😂👍🏼

[@riddhivasu.studies]

Thermodynamics is SUPER INTERESTING, but at the same time, sometimes kind of hectic to deal with 😂

[@flieu9342]

I think it’s very essential to define the unit of the Enthalpy of Reaction. What does the per mol stand for? Without discussing the concept of the Extent of Reaction, you will never truly understand the Enthalpy of Reaction, and why the Enthalpy of Reaction changes every time you manipulate your reactions.
Per mol means per mole reaction!

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thanks bozeman i got a 200 on my ap bio test because there was a 100 point bonus.

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when bozeman times'd that 2O by half i was like WHAT IS THIS BLACK MAGIC

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ha gonna get that F tomorrow

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@@jonathanpan3800 > four years ago :D

[@Kenzo_254]

You are a really great teacher. I don't take it for granted. Respect.

[@AchikaRozkuro]

I always had a hard time about this. Even after received it like 3 times in schools!!
Thanks a lot!!!! >w

[@HenriFaust]

The original dynamite was made from diatomaceous earth, and this is still the major component of the recipe. Several binding and stabilizing agents were later added to improve stability and slow the rate at which the nitroglycerin would seep out of the sticks and pool in the container. This is why dynamite must be turned regularly during long-term storage, or else it may spontaneously blow up. Dynamite sticks are wrapped in wax paper because the surface of each stick is always moist with seeping nitroglycerin.
Dynamite is still used commonly by civilian farmers in the USA, so you may encounter some lying around somewhere. Old dynamite is extremely unstable without the proper maintenance procedures. Do not touch abandoned dynamite, call the bomb squad instead.

[@Noellexafael]

And u just saved me from my teacher thanks a million haha, i have been struggling to remember that but the way you put things into perspective is really helpful.

[@GM-cz9sq]

You explained this in 8 minutes and managed to help me understand this better than my Chemistry professor did in an entire lecture period!

[@blue-wing2071]

and i take this in grade 12 :(

[@francisgregoryku1689]

Warlock i take this in gr11 lol taking a test about this tom. I guess senior high is on par with 1st -2nd yr college in some aspects

[@hobihobi1563]

i literally got a revelation watching this... thank you so much

[@mquartz7547]

Great explanation, very helpful! Thank you so much for all of your videos!

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Yes, thank you. That was really helpful!

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sir I got your all points but not in few seconds.sir really your all videos are great .I am from Punjab and not understanding English that's why.

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hi i love you mr anderson thanks for saving my grade

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Hello. Greetings from Austria.
I have only one complain. Namely sometimes subtitle cover some of your writings.
I guess it was added afterwards...

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It was literally perfect keep going ❤️

[@marijngoes6580]

check your vid around 2m50. your diagram goes wrong for changing the reaction around (invert products and reactants). I think it need correction

[@m000mbku2]

in the first problem, why is the oxygen a solid? why doesnt the arrow direction change when you reverse the reaction?

[@thierrytrevorbusinge8186]

"The Bozeman effect" has had a very good impact on me....THANK YOU A LOT

[@leensh752]

Wow. He just explained the whole thing at 1:16 while my tr spent 2 periods to say that.

[@JANxKylie]

Thanks for that. ive had a 3hrs chem class on that and i dint understand anything. thanks..
can u make a video on the cycle and how u can figue stuff out of that please?

[@divneet3474]

But isnt the literal meaning of enthalpy that the whole process occurs at constant temperature and pressure?

[@suffixable]

Can i know what's the difference between enthalpy of bond and enthalpy of heat of formation.
Thank you

[@rxthezh]

Just to point out I think the reaction in yellow at 4:44 should be o2(g) instead of o2(s)

[@jurassicdocs]

Thanks a lot

[@marijngoes6580]

Also you made a tiny mistake with the pahse symbol of oxygen. it is not solid, it is a gas

[@jokroast6912]

I have never seen these fraction superscripts before and they are hurting my brain.

[@santino4486]

video was helpful, could you explain to me what emthalpy fusion is ?

[@rachelmarie4008]

Min 6:05 made me subscribe!

[@anaslahrichi]

Is enthalpy related to entropy ? Does enthalpy fit in some thermodynamic principle ?

[@Bozemanscience1]

Enthalpy and entropy are related but they are not the same thing. I am currently working on an entropy video.

[@chrysik.5755]

anas lahrichi yes they are related through the 2nd therm. law: δq(rev)=TdS.
If you try for any to states to go (reversibly and under constant pressure): then you end with dU=Tds-pdV. (But because p,V,S, T are all quantities that are functions of states that's why you can use it generally between any 2 states!)
Now, using that ENTHALPY can be written: H=U+pV so dH=dU+d(pV)=TdS + VdP. (equation relating enthalpy and entropy) So H is a function of S and p!! Again only state functions!! And of course after this you can take the corresponding derivatives.... Saying dH/dS at constant p is Temperature.

[@reindeerchai1286]

I want to hug this man rn

[@CarineFrisch]

We can't see the target equation because of the transcript at the bottom of the screen.

[@rahulsurwase6627]

Thanks mr Anderson

[@danmadefurniture]

thankyou sir , it was quite helpful

[@praveendintakurthi5869]

Thanks a lot sir

[@Sialkotivloggers]

thanks sir but speak slowly .

[@nikan4now]

Great video. Can you please answer my question? With these diagrams, do they show enthalpy or purely potential chemical energy? My confusion arises from the following: In an exothermic reaction, we know that chemical potential energy decreases and for conservation of energy to hold, kinetic energy should rise (product molecules moving faster). But if we said enthalpy decreases there will be a contradiction because enthalpy is internal energy + PV (assuming PV change is zero) , internal energy ITSELF contains kinetic energy of the molecules, so how could overall enthalpy decrease (KE increases and potential energy decreases by the same amount)

[@adryanvalhallatier5259]

Why is the first target of oxygen is solid?

[@Mica_No]

Wow thanks

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very nice. Amazing explanation.

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Life saver

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very nice

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great

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0:52

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Thanks Mr. Bozeman

[@googleone9209]

Wonderful! Very intuitive! Than you

[@ikhlasdrifts7610]

3rd viewer HAHA :D

[@tinashemuza8671]

on 5:12 you made a mistake on the target reaction, which has oxygen as a solid. secondly i didnt find it clear how you got the half oxygen on the left side while it was on the right. otherwise the video was awesome

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THIS WAS AMAZING haha (:

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peen

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Teacher give me some calculations

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This was very helpful, thanks:)

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Thanks! It was really helpful!

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Sir, I am thankful for you.

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Thank you for great video!

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Excellent video, very concise.

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extremely helpful 😀 keep up the good work

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thanks for explanation

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Thank you Mr. Anderson

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much more useful than the khan

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THANK YOU!

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I need the entalpy of cellulose

[@scrappydoo69]

−963,000 kJ/mol

[@scrappydoo69]

That may be incorrect

[@arnolddreamer9667]

Very we'll done. Thanks!

[@LMk304]

Thank you so much!

[@waldo7779]

Can you go slower.. it takes time to understand.

[@TheBassAngler1]

rewind?

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khan academy exists for that