Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy

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  • เผยแพร่เมื่อ 25 ธ.ค. 2024

ความคิดเห็น • 109

  • @musabzulfiqar
    @musabzulfiqar 8 ปีที่แล้ว +77

    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 ปีที่แล้ว +185

    When her mouse handwriting is better than my pencil handwriting.

    • @2030games
      @2030games 6 ปีที่แล้ว +25

      Im guessing she uses a tablet but still its really neat :P

    • @jeffreyhuang3814
      @jeffreyhuang3814 4 ปีที่แล้ว +3

      @@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 ปีที่แล้ว +1

      Jeffrey Huang she might have it set to relative and not absolute

    • @aufspider4136
      @aufspider4136 4 ปีที่แล้ว +1

      @@jeffreyhuang3814 She could have moved her hand

    • @venomxxx4290
      @venomxxx4290 4 ปีที่แล้ว

      @@meatsupplies5282 😁👻

  • @safa4036
    @safa4036 6 ปีที่แล้ว +74

    she talks cute omg!

  • @josephcohen734
    @josephcohen734 4 ปีที่แล้ว +6

    Awesome video. You guys always make quality stuff.

  • @digantogaming
    @digantogaming 4 ปีที่แล้ว +1

    Nice video.Helpful to me I'm in class ix .This video topic make me very easier.

  • @SeekTheTruthAndTruth
    @SeekTheTruthAndTruth 6 ปีที่แล้ว +2

    great teaching skill.full clarity.

  • @HOMECINEMAMOVIENIGHT420
    @HOMECINEMAMOVIENIGHT420 4 ปีที่แล้ว +1

    Thank you so much and really good 👌👌👌

  • @Garryp0tterr
    @Garryp0tterr 8 ปีที่แล้ว +4

    Thankss!

  • @m.prophet4663
    @m.prophet4663 ปีที่แล้ว

    Nice video. Explained succinctly, pace is excellent,

  • @zquadzquad6856
    @zquadzquad6856 6 ปีที่แล้ว +10

    Handwriting is so beautiful

  • @zayed5763
    @zayed5763 4 ปีที่แล้ว +1

    you saved me thank you

  • @shivanimistry2982
    @shivanimistry2982 7 ปีที่แล้ว +7

    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👍🏾👍🏾

  • @sciencenerd7639
    @sciencenerd7639 3 ปีที่แล้ว

    this was a very helpful review for me, I sure appreciate this

  • @virupannamedikinal
    @virupannamedikinal ปีที่แล้ว

    Thank you so much,it was really helpful

  • @imani_8021
    @imani_8021 7 ปีที่แล้ว +4

    I finally get why I was getting my answer wrong....I was calculating ALL of the bonds and not just the ones that changed

  • @AliVeli-gr4fb
    @AliVeli-gr4fb 8 ปีที่แล้ว +9

    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 ปีที่แล้ว +4

      This is gen chem 1 ali, chill

  • @fredweker9106
    @fredweker9106 5 ปีที่แล้ว +3

    At what Bond disscociation Energy is a bond considered stable? Is 40 kJ/mol a stable bond?

  • @gg3675
    @gg3675 5 ปีที่แล้ว +1

    your handwriting and organization are high key way better than Sal's

  • @rodolfog2948
    @rodolfog2948 7 ปีที่แล้ว +2

    Great video, helped a lot. Thank you!

  • @bluesky8806
    @bluesky8806 4 ปีที่แล้ว +13

    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 2 ปีที่แล้ว +3

      i get it man

    • @Sunnybruh
      @Sunnybruh ปีที่แล้ว +1

      bro is down horrendous 💀

  • @yvonnegranger7334
    @yvonnegranger7334 7 ปีที่แล้ว +5

    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

  • @ahmedezzat687
    @ahmedezzat687 2 ปีที่แล้ว

    very clear thanks

  • @sinekonata
    @sinekonata 4 หลายเดือนก่อน

    I got it upside down so I recap here:
    You used 1707kJ to cut bonds. Cutting bonds is less stable with higher potential, requires energy to maintain.
    And got 1998kJ from making bonds. Making bonds is more stable, releases energy.

  • @aryadamle8772
    @aryadamle8772 3 ปีที่แล้ว +4

    btw why aren't the C-H bonds in reactants taken into account?

    • @garimaagarwal985
      @garimaagarwal985 3 ปีที่แล้ว +5

      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.

  • @umeshkrishna5908
    @umeshkrishna5908 3 ปีที่แล้ว

    Awesome writing

  • @arbindapandey1711
    @arbindapandey1711 5 ปีที่แล้ว +1

    Thanks alot. I could never understand the numerical by myself.

  • @huzaifarana3920
    @huzaifarana3920 8 ปีที่แล้ว +2

    it is the amount of energy required to break all bonds in 1 MOLE OF A SUBSTANCE. but it was a nice video :)

  • @harshitapaila3392
    @harshitapaila3392 7 ปีที่แล้ว

    its a really good video , helped me a lot..

  • @naif277
    @naif277 6 ปีที่แล้ว +13

    i only watched this because her voice is cute

  • @zeinamazin3743
    @zeinamazin3743 6 ปีที่แล้ว +2

    I love this explanation and your handwriting is amazing! :-)

  • @rogerharsh
    @rogerharsh 5 ปีที่แล้ว +2

    Like who have biggest thermodynamics chapter in 12th...I have 45pages...

  • @umaireasyhojao
    @umaireasyhojao 6 ปีที่แล้ว

    Thanks for teaching me something new😍

  • @tones-q7q
    @tones-q7q 7 ปีที่แล้ว

    I reckon you did an amazing job whoever you are !

  • @rajatpatel4657
    @rajatpatel4657 6 ปีที่แล้ว

    thanks

  • @EdreaGlmr
    @EdreaGlmr 8 ปีที่แล้ว +12

    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.

  • @fundamentalscience2335
    @fundamentalscience2335 5 ปีที่แล้ว +1

    Lovely.... 👍

  • @aparadeetyadas953
    @aparadeetyadas953 6 ปีที่แล้ว +3

    Dont u have to balance the rxn?

  • @coloredpandas1993
    @coloredpandas1993 7 ปีที่แล้ว +10

    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.

  • @jeremystott6861
    @jeremystott6861 6 ปีที่แล้ว +1

    best video ever

  • @tonytomei2843
    @tonytomei2843 7 ปีที่แล้ว +4

    Do you also sell propane accessories?

  • @sumyiamujahid9765
    @sumyiamujahid9765 6 ปีที่แล้ว +1

    Bond formation is an energy absorbing process ri8 ? I m confused

    • @nofaceman2571
      @nofaceman2571 5 ปีที่แล้ว +2

      Bond formation releases energy... Right???

    • @nofaceman2571
      @nofaceman2571 5 ปีที่แล้ว +2

      Because of overlapping of atoms (electrons)

  • @Music-zx4po
    @Music-zx4po ปีที่แล้ว

    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?

  • @sinekonata
    @sinekonata 4 หลายเดือนก่อน

    Why is the bond enthalpy for triple C-C bond lower than 3 C-C bonds? Shouldn't it be even easier to sever the last bond than the 1st and second of the 3, since the Cs would be closer together when triple bonded?

  • @Anas-nu7io
    @Anas-nu7io 8 ปีที่แล้ว +23

    I prefer sal

  • @b_08_amitkumarsahu90
    @b_08_amitkumarsahu90 7 ปีที่แล้ว

    kickboxing chemistry can be a combo

  • @juliakim8226
    @juliakim8226 7 ปีที่แล้ว

    What do you mean by '1 mol of a bond'?

    • @phillwithskill1364
      @phillwithskill1364 4 ปีที่แล้ว

      Maybe she means "the number of bonds within one mole of a given molecule"? I'm honestly not sure.

  • @nafisamamun4232
    @nafisamamun4232 6 ปีที่แล้ว +23

    I hate chemistry. Its so frustrating

  • @qhazadetaileddescription8730
    @qhazadetaileddescription8730 2 ปีที่แล้ว

    why is energy released when a bond is formed? I can't conceptualize it.

    • @multimeme5935
      @multimeme5935 2 หลายเดือนก่อน

      because the bonded molecules are now in lower energy state, molecules are bonded to do that (to minimize their energy and become stable).

  • @rajatmeena7341
    @rajatmeena7341 5 ปีที่แล้ว

    A beautiful vedio contains a beautiful handwriting and a beautiful voice with a beautiful explanation

  • @joshiifruit5554
    @joshiifruit5554 2 ปีที่แล้ว

    She has a pretty voice and handwriting

  • @Jcknight7996
    @Jcknight7996 7 ปีที่แล้ว

    what if it's in a soild form?

  • @forttimese
    @forttimese 5 ปีที่แล้ว +1

    popcorn xd

  • @michaelapinkturtle4210
    @michaelapinkturtle4210 6 หลายเดือนก่อน

    did you just write 'hess's law' instead of 'hess' law' 😮

  • @itsadelaine9048
    @itsadelaine9048 7 ปีที่แล้ว +3

    maitabasa ndakunzwisisa manje

  • @shrutishete6456
    @shrutishete6456 6 ปีที่แล้ว

    pretty

  • @JaceTimes
    @JaceTimes 6 ปีที่แล้ว +1

    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 7 ปีที่แล้ว +2

    I don't get it lol

  • @yunus2626
    @yunus2626 8 ปีที่แล้ว +1

    haters gonna hate..

  • @vvsparis
    @vvsparis 6 ปีที่แล้ว +3

    really good handwriting, Her voice lowkey annoying thoo

    • @jasonthomas9975
      @jasonthomas9975 2 ปีที่แล้ว +1

      bro
      u mean u cant concentrate. yeah me 2

    • @vvsparis
      @vvsparis 2 ปีที่แล้ว +1

      @@jasonthomas9975 i ended up getting 85 in this class lmao

  • @madelinemcdonald2609
    @madelinemcdonald2609 6 ปีที่แล้ว

    This woman sounds like the woman from that channel about ADHD. Can’t remember. She calls her followers “brains”

    • @jayceel251
      @jayceel251 8 หลายเดือนก่อน

      brother what 😭

  • @farooqfarooq6742
    @farooqfarooq6742 5 ปีที่แล้ว

    😰😵😨😲😛😩😣

  • @gabymendez7238
    @gabymendez7238 2 ปีที่แล้ว

    This was super helpful, thank you!
    😊