Hess's law and reaction enthalpy change | Chemistry | Khan Academy

[@Karamel159]

This video series saved my chemistry grade this unit. A two-hour lecture and meeting with the teacher after school didn't stick, but somehow this made everything click. Thank you!

[@massimo.pericolo.w]

You just made my whole semester of chemistry obsolete. I thank you for that.

[@bluehourcore]

wow this comment is 9 yrs old thats insane im studying it now

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@@bluehourcore lol same😂🙌🏻

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I’m studying now 2023 😢

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OMG. If i had found this like 2 hours ago, so much time would have been saved. Thanks so much, this was very helpful.

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Ken The G or like 2 months ago haha

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Welp, I might fail my chem test.

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Any update? (even thought it’s too late to ask😂😭)

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@@kennethdale6877 Ikr 😂😂

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Let the people know

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@@kennethdale6877 Sadly I do not remember.

[@SapphireEmeralds]

One of my chemistry teachers spent 2 weeks trying to explain that to me, and pretty much failed-- and this video simplified it WAY more than he did.It makes sense now! Thankyou.

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How I wish all teachers talk in moderate speed and a lot of patience like you Mr.Khan

[@s17srw]

Slight arithmatic error, 6x-1714.98=_1714.98, the video was still very useful for my exam, thanks :)

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Oh my goodness, it feels as though the world all makes sense! Thank you so much for helping me out with Chemistry! If I ever get stuck again, I will definitely come back to watch more of your videos.

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Mr. Khan, Saying you videos are helpful would be an understatement. The only thing I would like to see more, which you do in some videos, is a brief overview of the general steps/equations used. I find this extremely helpful especially in the longer videos that have a lot of content. Keep it up!!!!

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Chemistry exams in 22 hours and i couldn't figure shit out of this until i came across your video, what a relief....thank you Mr Khan :)

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My Chemistry final is tomorrow. I have learned more in watching Khan academy for the past 2 hours than I have learned in an entire year of class. --Speechless--

[@nhargravealton]

You my friend, are a life saver. I have A Level Chemistry coursework tomorrow afternoon and all I know is it's on enthalpy changes....which I knew hardly ANYTHING about before this. I couldn't sleep last night because I was worried I wasn't going to understand it. This video has helped so much. Thanks enternally :)

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The best part of his videos is the fact that they're videos, pause, replay etc, etc.

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no matter what i am trying to understand i come to khanacademy and everything is understood so clearly, i wish you were my professor!!!!

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God bless you, seriously. I had this concept explained to me by so many people but I did not get it until I actually stumbled upon this video. I wish I had known about this channel at the beginning of the semester.

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Where have you been all my life GREAT explanation.. i understood first time round.

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this video remains great after 9 years! #teamkhanacademy

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10!!! :)

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thank you soooooooo much, i've been sit in my chem class since school starts and now i understand everything just by this 15 min video..

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just got an A- on my AP Chem final. Couldn't have done it without you

[@Jesus_is_Good_God]

I missed a lecture on this topic and understanding it mainly on the textbook was kind of complex, but after watching this simplified powerful video with examples, I am now adept at this topic!!!😍 thanks so much

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Your video confirms that I know what I'm doing. Thank you =)

[@JustinPlaxton]

this was REALLY helpful i have been studying this for two hours and didn't get it then in 15min i completely understand thank you!

[@AM-qz9kw]

no one else can explain it properlt, thank you for simplifying and not using unnecessary arrows all over tha place

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You prove why all teachers should be fired and why we should simply learn from amazing teachers at home like you.

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OMG! Dude u rock man. I didnt understand a thing during my lecture earlier. After watching i understand now. Thanks to you. You should be a professor:)

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Test tomorrow! You made all of my studying make sense. It's all clear now. :)

[@chaserzx383]

thanks really helpful. as the other person mentioned, if only I had found it 2 hours ago.

[@fleshcookie]

8:58- 9:10 = hilarious calculator indecision. Sal you crack me up.

[@bethan9597]

Saved my chemistry as level! Thanks:)

[@zeinamazin3743]

lol same :-)

[@sonuthapa6090]

Zeina Mazin will be giving on oct/nov session! I literally have no idea on how to draw enthalpy cycle.

[@commandobilly113]

Holy shit, now it's clear to me. Thank you!

[@sosburn24]

You may have just saved my life! Thank you! I haven't been sure how to even begin studying but this has helped

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Are you alive m8?

[@kenonumaku23]

"Hope you found that helpful"...are you kidding me, just helpful? you are a hero indeed!

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U make me regain my confidence in understanding this.... tear*

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Wow this video was great! Thanks so much

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its so fun and easy watching you videos that it doesnt even feel like im studying, even though im learning stuff like crazy xD

[@snnacho]

I did find that helpful. Thanks Sal.

[@zramdeen]

u da BOSS ... i was absent the day my teacher taught this.. ty for explaning

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you are my second ap chem teacher!

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your voice is strangely soothing

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You are a legend sir ❤️

[@SeekTheTruthAndTruth]

full clarity .explained very well.thanks

[@alexmotaf]

Amazing lesson!! I was strugling with that all night until i saw your video! thank very much!

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KhanAcademy, thank you very much for these tutorials. They've saved my arses many times over.

[@aditya7784]

thanks it helps me understand more. Can you talk about different types of enthalpies such as atomisation, bond, enthalpy of solution, lattice enthalpy.

[@TadanoCandy]

I understood almost nothing till I watched this video. I wont fail my test tomorrow! Very Grateful!!! :D

[@jamiethaigirl123]

Thank you so much, Dr. Khan! You explained it a lot better than my teacher.

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great explanation!! I should start skipping my chem class and watching youtube teaching videos instead, I would probably learn more. Thanks for the video!

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if it was not for you this semester i would be failing college chemistry, keep up the good work sir

[@shatzE3]

THANK YOU SO MUCH!! u finally cleared my confusion. I go to the (currently) 4th best skl in the UK nd my chem teacher is still could get this through my head but u done it 15mins lool

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Thanks!, Very helpful!

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this video makes my life easier, thank you mr. khan

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YOU ARE A GOD!!!!!! THANK YOU SOOOOOO MUCH!!!! YOU ARE GOING TO SAVE MY HONORS CHEMISTRY GRADE :-)

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great video i learned more in 16 min than i did in a week

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YEEESSS!!! Now it makes sense! Thank You :) :)

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great! thank you for the valuable knowledge!!!

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You're*

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Kay Dude you gotta watch your attitude. It doesn't take god a lot of time to humiliate man. Think your English rocks. Help somebody then.

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Thanks man. You’re gifted

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back to this video. i bombed this last test because my professor drops the lowest grade and i already did well on the other ones, but the final is next week!!! need to understand this video.

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This was so helpful, THANK YOU SO MUCH! you have saved me from hours of confusion.

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My god, your videos always save me!!! Thank you so much

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I don't know why I even bother going to class I learn more watching these.

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that was so helpful! thank you so much khanacademy! :D

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thanks man great explanation! looks like i dont have to fail chem this year! :)

[@donothack]

This video helped me a ton, thanks

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Omg thank you so much. This actually made sense to me.

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thank you dr. khan. you make learning fun

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Thanks so much for this🙏🏽

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you are amazing! thank you so much

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Thank you for all of your help. When I'm rich I will donate many treasures to you.

[@kayathon]

now i totally get it, thankyou so much :)

[@bnz7253]

Thank you, very helpful

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your voice is interesting...but at the same time soothing haha

[@Sasha7amad]

Loved this!!!

[@snnacho]

@Pablothe you should probably make a video showing everyone how to do Thermochemistry now...

[@jaiparkash9164]

thanks it helped me a lot

[@youssefm.al-aasar8788]

the propane is in a gaseous state, not liquidous.

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Youssef M. Al-Aasar wqaeaweFźhqwqx

[@willmoody951]

same man

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thank you again u the best.....

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Really good thanks :D

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You sir, are better than my disgusting Chemistry teachers. Kudos to you.

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God bless your soul Sal

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i had to stand up and clap for 5 minutes after this video out of amazement

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studied 2 week @school. 15 min with khan academy

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7 years laters this video still a saver

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thank you! I might actually pass Chemistry now! My lecturer sucks :/

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Fantastic

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THANK YOU GOOD SIR

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Thank you!!

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Great

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Amazing.

[@RockNLoad07]

@shatzE3 Rewatch it and listen to him carefully, Water is - 285.53, his - and 2 just combined so it looks like plus. Easy mistake to make though if you didn't hear him or watch him pick it off the list.