Enthalpy of Reaction

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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.wikimedia.org/wiki/Fil....
"File:AlfredNobel Adjusted.jpg." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.org/wiki/File:Alf....
"File:Dynamite-5.svg." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.org/wiki/File:Dyn....
"File:Hess Germain Henri.jpg." Wikipedia, the Free Encyclopedia. Accessed December 22, 2013. en.wikipedia.org/wiki/File:Hes....
"File:Nitroglycerin-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed December 16, 2013. en.wikipedia.org/wiki/File:Nit....
"File:ThermiteReaction.jpg." Wikipedia, the Free Encyclopedia, December 11, 2013. en.wikipedia.org/w/index.php?t....
Haacken, User: Herbert. English: Instant Cold Pack, March 15, 2012. Own work: Herbert Haacken. commons.wikimedia.org/wiki/Fil....
V1adis1av. Single Crystal of Lithium Fluoride, LiF, in a Beaker with Water, March 20, 2008. Own work. commons.wikimedia.org/wiki/Fil....

Опубликовано:

26 дек 2013

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Комментарии : 127

@nicolefurze688 8 лет назад

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- 3 года назад

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

@samnoname2010 10 лет назад

If I ever manage to get a PHD I'm giving you half of it

@912sonic 7 лет назад

LOOOOL

@Z3ROWOLFHD 6 лет назад

u get that phd bro?

@avira1d 5 лет назад

Did you get the PHD???

@cocoarecords 5 лет назад

samnoname2010 he dropped out

@jenspetter1454 4 года назад

?? so did you give half of it?

@alyssahoffman8855 8 лет назад

I like this more than Khan Academy

@jennycarnie7804 8 лет назад

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

@alyssahoffman8855 8 лет назад

of course (;

@anishabisht4213 5 лет назад

Lol Hoffman reaction

@DivineSeaDragon 4 года назад

Alyssa Hoffman agreed

@simplededication1945 2 года назад

Me too👍

@zenalc536 8 лет назад

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

@m.moorthym.moorthy232 3 года назад

Your wish came true

@Kenzo_254 2 года назад

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

@liammarie1447 5 лет назад

I literally shed a tear because of this 😂 thank you

@tanyay1073 8 лет назад

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

@Angie-no7qx 3 года назад

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

@winterhuff1338 3 года назад

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

@Noellexafael 6 лет назад

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 7 лет назад

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 6 лет назад

and i take this in grade 12 :(

@francisgregoryku1689 6 лет назад

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

@mquartz7547 10 лет назад

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

@thierrytrevorbusinge8186 3 года назад

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

@hobihobi1563 5 лет назад

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

@maryshabo6261 4 года назад

It was literally perfect keep going ❤️

@zanahmed9343 3 года назад

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

@oogalook 10 лет назад

Thanks for the great video! Very helpful.

@flieu9342 2 года назад

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!

@jessecruz6241 9 лет назад

I love your videos sir! Thank u soo much!

@AyoItzMat 10 лет назад

Excellent video, very concise.

@jacobh1995 9 лет назад

Thanks Mr. Bozeman

@helishah6903 5 лет назад

Thank you Mr. Anderson

@avira1d 5 лет назад

Sir, I am thankful for you.

@mcnagi4246 Месяц назад

Yes, thank you. That was really helpful!

@meernahro7164 8 лет назад

extremely helpful 😀 keep up the good work

@13eun 9 лет назад

Thank you for great video!

@googleone9209 9 лет назад

Wonderful! Very intuitive! Than you

@eskilingemann1783 9 лет назад

This was very helpful, thanks:)

@reindeerchai1286 Год назад

I want to hug this man rn

@ComandaKronikk 7 лет назад

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

@nailfreaksonly3131 5 лет назад

Paris Coroneos stfu

@whitewolfie 5 лет назад

Thanks! It was really helpful!

@rahulsurwase6627 2 года назад

Thanks mr Anderson

@AchikaRozkuro 10 лет назад

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

@andrewchen861 2 месяца назад

hi i love you mr anderson thanks for saving my grade

@janaxy6024 7 лет назад

love this guy

@riddhivasu.studies Год назад

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

@santino4486 7 лет назад

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

@HenriFaust 9 месяцев назад

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.

@JANxKylie 10 лет назад

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?

@Sialkotivloggers 7 лет назад

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.

@sungminpark8467 10 лет назад

thank you so much!! I can understand now!

@suffixable 10 лет назад

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

@jokroast6912 5 лет назад

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

@danmadefurniture 4 года назад

thankyou sir , it was quite helpful

@ruixuanzh 4 года назад

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

@jurassicdocs 3 года назад

Thanks a lot

@m000mbku2 9 лет назад

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

@mandradep97 9 лет назад

THANK YOU!

@anaslahrichi 10 лет назад

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

@Bozemanscience1 10 лет назад

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

@chrysik.5755 8 лет назад

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.

@marijngoes6580 10 лет назад

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

@francisgregoryku1689 6 лет назад

SO GOOD

@praveendintakurthi5869 4 года назад

Thanks a lot sir

@soumiakh7931 5 лет назад

Thank y so much 💞💞💞

@CarineFrisch 7 лет назад

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

@valefaraci 9 лет назад

Thank you!!!!!!!!

@kareem9102 10 лет назад

very nice. Amazing explanation.

@sciencenerd7639 2 года назад

very nice

@tinashemuza8671 6 лет назад

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

@datkarysbergenov2287 9 лет назад

thanks for explanation

@joannamarquez1925 9 лет назад

THIS WAS AMAZING haha (:

@baileysewell9167 4 года назад

peen

@KDawgHere 9 лет назад

Life saver

@divneet3474 8 лет назад

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

@Nice69 10 лет назад

Cool!

@nikan4now 3 года назад

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)