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Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy 

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Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/bond-enthalpy-and-enthalpy-of-reaction
Introduction to bond enthalpy, and how to use bond enthalpies to calculate enthalpy of reaction.
Watch the next lesson: www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/2015-ap-chemistry-free-response-7?YT&Desc&
Missed the previous lesson? www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/hess-s-law-example?YT&Desc&
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26 май 2016

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Комментарии : 106   
@musabzulfiqar
@musabzulfiqar 7 лет назад
great video. Screw the haters, they will complain about literally anything but have no ability to do anything else. I'm a university student and this helped me
@thecocomidget
@thecocomidget 6 лет назад
When her mouse handwriting is better than my pencil handwriting.
@2030games
@2030games 6 лет назад
Im guessing she uses a tablet but still its really neat :P
@jeffreyhuang3814
@jeffreyhuang3814 4 года назад
@@2030games If you look at 0:23 she moves her cursor to the left to write. So I'm guessing it is mouse handwriting, as opposed to tablet handwriting.
@meatsupplies5282
@meatsupplies5282 4 года назад
Jeffrey Huang she might have it set to relative and not absolute
@aufspider4136
@aufspider4136 3 года назад
@@jeffreyhuang3814 She could have moved her hand
@venomxxx4290
@venomxxx4290 3 года назад
@@meatsupplies5282 😁👻
@SeekTheTruthAndTruth
@SeekTheTruthAndTruth 6 лет назад
great teaching skill.full clarity.
@safa4036
@safa4036 5 лет назад
she talks cute omg!
@aufspider4136
@aufspider4136 3 года назад
why
@godhelpme8977
@godhelpme8977 3 года назад
She wear glasses
@josephcohen734
@josephcohen734 3 года назад
Awesome video. You guys always make quality stuff.
@sciencenerd7639
@sciencenerd7639 2 года назад
this was a very helpful review for me, I sure appreciate this
@digantogaming
@digantogaming 3 года назад
Nice video.Helpful to me I'm in class ix .This video topic make me very easier.
@gabymendez7238
@gabymendez7238 Год назад
This was super helpful, thank you! 😊
@rayane5051
@rayane5051 8 лет назад
Thankss!
@m.prophet4663
@m.prophet4663 8 месяцев назад
Nice video. Explained succinctly, pace is excellent,
@virupannamedikinal
@virupannamedikinal Год назад
Thank you so much,it was really helpful
@zayed5763
@zayed5763 3 года назад
you saved me thank you
@HOMECINEMAMOVIENIGHT420
@HOMECINEMAMOVIENIGHT420 3 года назад
Thank you so much and really good 👌👌👌
@fredweker9106
@fredweker9106 4 года назад
At what Bond disscociation Energy is a bond considered stable? Is 40 kJ/mol a stable bond?
@shivanimistry2982
@shivanimistry2982 7 лет назад
Thank you found this really helpful, I'm a first year student and it's nice to understand it the way you've explained it keep it up👍🏾👍🏾
@ProGamer-wm9su
@ProGamer-wm9su 4 года назад
Hello
@ahmedezzat687
@ahmedezzat687 2 года назад
very clear thanks
@zquadzquad6856
@zquadzquad6856 5 лет назад
Handwriting is so beautiful
@rodolfog2948
@rodolfog2948 7 лет назад
Great video, helped a lot. Thank you!
@imani_8021
@imani_8021 7 лет назад
I finally get why I was getting my answer wrong....I was calculating ALL of the bonds and not just the ones that changed
@yvonnegranger7334
@yvonnegranger7334 7 лет назад
Thank you soooo much!!! Just started learning about thermodynamics at university and this has helped immensely would probably not pass if it weren't for you guys
@umeshkrishna5908
@umeshkrishna5908 3 года назад
Awesome writing
@gg3675
@gg3675 4 года назад
your handwriting and organization are high key way better than Sal's
@bradydiscgolfwatson2125
@bradydiscgolfwatson2125 Год назад
Whoa, shots fired
@AliVeli-gr4fb
@AliVeli-gr4fb 8 лет назад
Thank you nice explanation. I may add a few things. bond breaking requires energy because in bound state,total mass of bound atoms are actually lower than total of mass when they are free. so we need to give energy and they take this energy and convert to their mass. Einstein's formula.. I think there are very deep relations down there but everything is nice
@saidmilano5022
@saidmilano5022 6 лет назад
This is gen chem 1 ali, chill
@aridatony99
@aridatony99 7 лет назад
I reckon you did an amazing job whoever you are !
@harshitapaila3392
@harshitapaila3392 7 лет назад
its a really good video , helped me a lot..
@Music-zx4po
@Music-zx4po Год назад
Would somebody oblige to explain the case of a dimer formation as in Diargon where Electron Affinity is positive. Would H still be negative, i.e. that formation still be considered as releasing energy?
@umaireasyhojao
@umaireasyhojao 6 лет назад
Thanks for teaching me something new😍
@aryadamle8772
@aryadamle8772 3 года назад
btw why aren't the C-H bonds in reactants taken into account?
@garimaagarwal985
@garimaagarwal985 2 года назад
The C-H bonds in the reactant are not broken and retained in the product. So even if you consider the bond dissociation enthalpy in reactant, you will have to consider bond formation enthalpy in product and being opposite in nature these would just cancel out.
@huzaifarana3920
@huzaifarana3920 7 лет назад
it is the amount of energy required to break all bonds in 1 MOLE OF A SUBSTANCE. but it was a nice video :)
@arbindapandey1711
@arbindapandey1711 4 года назад
Thanks alot. I could never understand the numerical by myself.
@rogerharsh
@rogerharsh 4 года назад
Like who have biggest thermodynamics chapter in 12th...I have 45pages...
@tonytomei2843
@tonytomei2843 7 лет назад
Do you also sell propane accessories?
@rajatpatel4657
@rajatpatel4657 6 лет назад
thanks
@fundamentalscience2335
@fundamentalscience2335 4 года назад
Lovely.... 👍
@zeinamazin3743
@zeinamazin3743 6 лет назад
I love this explanation and your handwriting is amazing! :-)
@bluesky8806
@bluesky8806 4 года назад
I really had to force myself to stop focusing on how cute she talks and rather listen to whats she's talking about.
@jasonthomas9975
@jasonthomas9975 Год назад
i get it man
@Sunnybruh
@Sunnybruh Год назад
bro is down horrendous 💀
@jeremystott6861
@jeremystott6861 5 лет назад
best video ever
@qhazadetaileddescription8730
@qhazadetaileddescription8730 2 года назад
why is energy released when a bond is formed? I can't conceptualize it.
@aparadeetyadas953
@aparadeetyadas953 5 лет назад
Dont u have to balance the rxn?
@sumyiamujahid9765
@sumyiamujahid9765 5 лет назад
Bond formation is an energy absorbing process ri8 ? I m confused
@nofaceman2571
@nofaceman2571 5 лет назад
Bond formation releases energy... Right???
@nofaceman2571
@nofaceman2571 5 лет назад
Because of overlapping of atoms (electrons)
@juliakim8226
@juliakim8226 6 лет назад
What do you mean by '1 mol of a bond'?
@phillwithskill1364
@phillwithskill1364 4 года назад
Maybe she means "the number of bonds within one mole of a given molecule"? I'm honestly not sure.
@coloredpandas1993
@coloredpandas1993 6 лет назад
Hahah I get it!! Thank you so much!!! I find you better than Sal. I can't stand his uhhh's and the constant repeating of a sentence when he changes his colors. I mean I do love Sal but you're like the sister-in-law that you love more than your brother if you understand.
@b_08_amitkumarsahu90
@b_08_amitkumarsahu90 7 лет назад
kickboxing chemistry can be a combo
@naif277
@naif277 6 лет назад
i only watched this because her voice is cute
@EdreaGlmr
@EdreaGlmr 8 лет назад
Thank you, although I have to say this video has a lot of mistakes in the narration, several times the voice says something that is not correct (like in time 8:20 is not the bonds that are broken but the ones that are formed...) maybe you don't care but if this comment has any help for you to get better videos in the future it would achieved its purpose.
@Sameer-sx7ek
@Sameer-sx7ek 6 лет назад
great
@detectivebrown4499
@detectivebrown4499 6 лет назад
hi isnt the c-h bond 8 bonds ?
@Jcknight7996
@Jcknight7996 7 лет назад
what if it's in a soild form?
@forttimese
@forttimese 5 лет назад
popcorn xd
@nafisamamun4232
@nafisamamun4232 6 лет назад
I hate chemistry. Its so frustrating
@joshiifruit5554
@joshiifruit5554 Год назад
She has a pretty voice and handwriting
@shrutishete6456
@shrutishete6456 6 лет назад
pretty
@Anas-nu7io
@Anas-nu7io 7 лет назад
I prefer sal
@junaidmughal3806
@junaidmughal3806 6 лет назад
joe bloggs sal is GOWD
@vvsparis
@vvsparis 5 лет назад
Anas way more
@michaelapinkturtle4210
@michaelapinkturtle4210 29 дней назад
did you just write 'hess's law' instead of 'hess' law' 😮
@rajatmeena7341
@rajatmeena7341 4 года назад
A beautiful vedio contains a beautiful handwriting and a beautiful voice with a beautiful explanation
@jasonthomas9975
@jasonthomas9975 Год назад
bro its video not vedio.
@itsadelaine9048
@itsadelaine9048 6 лет назад
maitabasa ndakunzwisisa manje
@farooqfarooq6742
@farooqfarooq6742 4 года назад
😰😵😨😲😛😩😣
@JaceTimes
@JaceTimes 6 лет назад
Incorrect: I kept getting the wrong answers and its because you are suppose to add the bonds formed then subtract it from the bonds broken instead of subtracting the bonds made.
@michellec.4291
@michellec.4291 6 лет назад
I don't get it lol
@2ndintelligentWorld
@2ndintelligentWorld 5 лет назад
LOL
@madelinemcdonald2609
@madelinemcdonald2609 6 лет назад
This woman sounds like the woman from that channel about ADHD. Can’t remember. She calls her followers “brains”
@jayceel251
@jayceel251 2 месяца назад
brother what 😭
@yunus2626
@yunus2626 7 лет назад
haters gonna hate..
@vvsparis
@vvsparis 5 лет назад
really good handwriting, Her voice lowkey annoying thoo
@jasonthomas9975
@jasonthomas9975 Год назад
bro u mean u cant concentrate. yeah me 2
@vvsparis
@vvsparis Год назад
@@jasonthomas9975 i ended up getting 85 in this class lmao
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