Enthalpy of Reaction

Рет қаралды 320,096

10 жыл бұрын

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....

Пікірлер: 127

@nicolefurze688 8 жыл бұрын

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 жыл бұрын

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

@samnoname2010 10 жыл бұрын

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

@912sonic 7 жыл бұрын

LOOOOL

@Z3ROWOLFHD 6 жыл бұрын

u get that phd bro?

@avira1d 5 жыл бұрын

Did you get the PHD???

@cocoarecords 5 жыл бұрын

samnoname2010 he dropped out

@jenspetter1454 4 жыл бұрын

?? so did you give half of it?

@Angie-no7qx 3 жыл бұрын

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

@alyssahoffman8855 8 жыл бұрын

I like this more than Khan Academy

@jennycarnie7804 8 жыл бұрын

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

@alyssahoffman8855 8 жыл бұрын

of course (;

@anishabisht4213 5 жыл бұрын

Lol Hoffman reaction

@DivineSeaDragon 4 жыл бұрын

Alyssa Hoffman agreed

@simplededication1945 2 жыл бұрын

Me too👍

@zenalc536 8 жыл бұрын

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

@m.moorthym.moorthy232 3 жыл бұрын

Your wish came true

@Kenzo_254 2 жыл бұрын

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

@tanyay1073 8 жыл бұрын

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

@liammarie1447 5 жыл бұрын

I literally shed a tear because of this 😂 thank you

@thierrytrevorbusinge8186 3 жыл бұрын

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

@winterhuff1338 3 жыл бұрын

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

@mquartz7547 10 жыл бұрын

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

@Noellexafael 6 жыл бұрын

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 жыл бұрын

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 жыл бұрын

and i take this in grade 12 :(

@francisgregoryku1689 6 жыл бұрын

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 6 жыл бұрын

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

@flieu9342 2 жыл бұрын

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!

@zanahmed9343 3 жыл бұрын

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

@oogalook 10 жыл бұрын

Thanks for the great video! Very helpful.

@maryshabo6261 4 жыл бұрын

It was literally perfect keep going ❤️

@jessecruz6241 9 жыл бұрын

I love your videos sir! Thank u soo much!

@AyoItzMat 10 жыл бұрын

Excellent video, very concise.

@jacobh1995 9 жыл бұрын

Thanks Mr. Bozeman

@helishah6903 5 жыл бұрын

Thank you Mr. Anderson

@reindeerchai1286 Жыл бұрын

I want to hug this man rn

@avira1d 5 жыл бұрын

Sir, I am thankful for you.

@santino4486 7 жыл бұрын

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

@mcnagi4246 2 ай бұрын

Yes, thank you. That was really helpful!

@suffixable 10 жыл бұрын

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

@JANxKylie 10 жыл бұрын

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?

@meernahro7164 8 жыл бұрын

extremely helpful 😀 keep up the good work

@ComandaKronikk 7 жыл бұрын

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

@nailfreaksonly3131 5 жыл бұрын

Paris Coroneos stfu

@13eun 9 жыл бұрын

Thank you for great video!

@googleone9209 9 жыл бұрын

Wonderful! Very intuitive! Than you

@eskilingemann1783 9 жыл бұрын

This was very helpful, thanks:)

@rahulsurwase6627 2 жыл бұрын

Thanks mr Anderson

@whitewolfie 5 жыл бұрын

Thanks! It was really helpful!

@rxthezh 4 жыл бұрын

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

@andrewchen861 3 ай бұрын

hi i love you mr anderson thanks for saving my grade

@sungminpark8467 10 жыл бұрын

thank you so much!! I can understand now!

@AchikaRozkuro 10 жыл бұрын

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

@janaxy6024 7 жыл бұрын

love this guy

@danmadefurniture 4 жыл бұрын

thankyou sir , it was quite helpful

@HenriFaust 10 ай бұрын

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.

@m000mbku2 9 жыл бұрын

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

@marijngoes6580 10 жыл бұрын

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

@riddhivasu.studies Жыл бұрын

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

@jokroast6912 5 жыл бұрын

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

@anaslahrichi 10 жыл бұрын

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

@Bozemanscience1 10 жыл бұрын

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

@chrysik.5755 9 жыл бұрын

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.

@jurassicdocs 3 жыл бұрын

Thanks a lot

@Sialkotivloggers 7 жыл бұрын

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.

@praveendintakurthi5869 4 жыл бұрын

Thanks a lot sir

@mandradep97 9 жыл бұрын

THANK YOU!

@sciencenerd7639 2 жыл бұрын

very nice

@kareem9102 10 жыл бұрын

very nice. Amazing explanation.

@soumiakh7931 5 жыл бұрын

Thank y so much 💞💞💞

@CarineFrisch 7 жыл бұрын

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

@joannamarquez1925 9 жыл бұрын

THIS WAS AMAZING haha (:

@baileysewell9167 4 жыл бұрын

peen

@rachelmarie4008 4 жыл бұрын

Min 6:05 made me subscribe!

@francisgregoryku1689 6 жыл бұрын

SO GOOD

@datkarysbergenov2287 9 жыл бұрын

thanks for explanation

@tinashemuza8671 6 жыл бұрын

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

@valefaraci 9 жыл бұрын

Thank you!!!!!!!!

@divneet3474 8 жыл бұрын

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

@KDawgHere 9 жыл бұрын

Life saver

@stimulantdaimamld2099 Жыл бұрын

great

@Mica_No 4 жыл бұрын

Wow thanks

@zerok7038 10 жыл бұрын

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

@shabnam_sajida 5 жыл бұрын

Thanks

@adryanvalhallatier5259 6 жыл бұрын

Why is the first target of oxygen is solid?

@philippebouchard9093 8 жыл бұрын

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

@Nice69 10 жыл бұрын

Cool!

@marijngoes6580 10 жыл бұрын

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

@LMk304 8 жыл бұрын

Thank you so much!

@arnolddreamer9667 8 жыл бұрын

Very we'll done. Thanks!

@waffleslmao8356 3 жыл бұрын

0:52

@leensh752 3 жыл бұрын

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

@shadowfiend4436 9 жыл бұрын

ha gonna get that F tomorrow

@jonathanpan3800 5 жыл бұрын

howd u do? ima get that f too

@spookimiiki5891 5 жыл бұрын

@@jonathanpan3800 > four years ago :D

@hindveeyadav5143 8 жыл бұрын

thankssssssssssssssss.

@mitshah2162 9 жыл бұрын

Best

@nikan4now 4 жыл бұрын

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)