Hess's Law - Chemistry Tutorial

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This chemistry tutorial covers how to solve for the enthalpy of reaction for an given reaction by using Hess's Law and the delta H values for other known chemical reactions. This tutorial involves several examples demonstrating the use of Hess's Law, which allows for the calculation of an unknown enthalpy of reaction from other reactions due to the fact that enthalpy is a state function.
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30 сен 2024

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Комментарии : 214

@Tragel102 10 лет назад

im so screwed for my quiz

@geumji2406 9 лет назад

Perhaps the most seductive hess's law tutorial video I've ever seen

@GuineaPigWWE 10 лет назад

Tries to teach you chemistry... steals your heart.

@jamesvongampai5592 10 лет назад

i love her voice. it makes chem really soothing to learn and less likely to give up :]

@moeidnasir534 9 лет назад

your voice haunts me in my sleep

@Daveyjonez33 10 лет назад

is this luna lovegood speaking?

@silva171717 9 лет назад

you saved my life. thank you so much. and u have such sweet voice.god bless you.

@TheChemistrySolution 10 лет назад

Please help us continue making FREE chemistry videos by clicking on the link below and voting for Big Head Business Solutions. It will take less than 10 seconds, I promise! Thank you! Thank you! ~Missy (The Chemistry Solution) www.missionmainstreetgrants.com/business/detail/33553

@amalmohammad5711 9 лет назад

The whole Arab nation is watching your video hahahaha you've helped us in chemistry a lot !!! THANK YOU SO MUCH

@FireSymphoney 10 лет назад

YOU ARE AMAZING!! what the Chemistry teacher failed to teach in 2 hours you taught it in less the 15 Minutes ,, Lady you deserve a Like And a Subscribe ,,Keep Up The BRILLIANT WORK!!

@hiimtanamel4844 9 лет назад

holy.... u saved me!! i never got this shitty law and now i got it

@AhmedYanaal 10 лет назад

OMG gurl, your voice is soooooo beautiful and flawless. Its just that your voice and the instructions make this PERFECT. =D You should youtube a song btw, your voice is just... just... amazing

@TheLonelyFawn 10 лет назад

Thank you!! Your method make so much more sense than the diagrams they draw at uni to try and explain it :L Really helpful!

@JoChen-gb4xr 10 лет назад

OH MY GOD. THIS VIDEO SAVE ME in my last 3 hours of the online submission DEADLINE

@sbrodie99 9 лет назад

This was extremely helpful for me - I used to think Hess's Law questions were about making up the enthalpy numbers for the moles of reactant but then I saw the way you cancelled out the moles in the equations and it was like an epiphany! Thanks Missy :-) xxx

@satbirsekhon7080 10 лет назад

Honestly you make everything so simple to understand, probably the best video I've seen on Hess's law. Also I like how you showcase all your work. Thank you

@paulinofab3665 9 лет назад

finally made Hess's law simple 😃😃😄😄

@jshatzman 10 лет назад

THANK YOU THANK YOU THANK YOU!!!!!!!!! I was really struggling. This doesn't mean I'll pass my midterm tomorrow but at least I can do the practice problems without crying now!

@YemensHeart93 9 лет назад

what a clear perfect explanation. Thank you!!

@KHRxHibariKyoya 9 лет назад

Great voice, but slooowwww haha

@SeunJubril 11 лет назад

Wow. 2 weeks of confusion cured in the first 3 minutes. Thank you. :)

@cooter3690 9 лет назад

The units of the reaction are not kilojoules per mole. It's just kilojoules because you have a coefficient of two in front of the reactants and product. If you divided the delta H by the coefficient then you would get kilojoules per mole

@zillajratomicray 9 лет назад

How come at 8:25 she didn't just multiply the equation by 10 to make the 1/2O2 into 5O2? I thought you just had to look for similar compounds.

@HaloSpartan713 9 лет назад

thank you so much for the help. hopefully i wont fail my test. also i have to be the billionth person to say this but you have a fantastic voice.

@wwoowwz 9 лет назад

I have a big test and this tutorial was AMAZING! I feel so much more confident now thanks!

@BaharLovesMakeup 10 лет назад

Thank you so much for the tutorial! It was very helpful! :)

@MsForeverlover 10 лет назад

Thank you! Learned a lot from your video than I did from reading the chemistry book.

@WarlordM 12 лет назад

YEILDS, the appropriate phrase is YEILDS, not "GIVES YOU."

@Blujay4444 10 лет назад

Thanks so much! My chem teacher didn't explain it nearly as well as you!

@Noobman79 9 лет назад

Holy fuck. Thank you. Thank you. Thank you.

@marializnieves1637 10 лет назад

This was so incredibly useful! I understand sooooo much better now. Thank you! :)

@proudnerd14 10 лет назад

WITCHCRAFT! thanks from an ap chem student

@12345678935257 9 лет назад

Ur voice is my life 😍

@ZPskiskate 10 лет назад

Thank you so much I have a chemistry test today and this stuff was so confusing, I even tried studying in the book and my notes but that got me nowhere, but this was an awesome explanation

@eisenj21188 10 лет назад

thanks a lot!!! great lesson! beautiful voice by the way! come teach at my college!

@ridenhour1 9 лет назад

I guess the rules of Mathematics don't apply to chemistry. Just forget about changing the signs or dividing when crossing over the equal sign. I guess I am free to do what ever I want and not worry about if it makes sense.

@nancyjan25 10 лет назад

How did you cancel O(2) when it was 2:1 ratio.......?????????

@hinyc9150 10 лет назад

You mean 4:58? There are 2O2(g) on the reactant side and also 1O2(g) on the product side. Therefore, we can cancel out 1O2(g) on both sides. Just simplify the equation. (please excuse for my poor english...)

@azizweysi6686 10 лет назад

Why did you change 2O2 (g) on the reactant side to 1O2(g) at 4:58? I'm confused.

@hinyc9150 10 лет назад

There are 2O2(g) on the reactant side and also 1O2(g) on the product side. Therefore, we can cancel out the 1O2(g) on both side. (please excuse for my poor english...)

@samgallahan1941 9 лет назад

Thank you so much!! So helpful :) Finally understand this! 7 hours before the test lol

@SoapyDuckling 10 лет назад

So I have an exam on this tomorrow and the entire unit I had no idea what my teacher was talking about when he said to flip the equation and multiply and now it makes perfect sense! Awesome video thank you!!!

@samuelfraley1282 9 лет назад

For the first example, whydo you have to move CO2? Isn't it already a product for the initial equation and the first one?

@GoOutAndBike 11 лет назад

I don't know what it is but I started to fall in love with chemistry all of the sudden

@matarloum2894 10 лет назад

i have this C2H4 (g) + H2 (g) -> C2H6 (g) why doesn't work ?

@jaredhernon1925 9 лет назад

I'm playing the video a 2nd time just to listen to her voice. I already know Hess's Law hahaha

@devilmax07crazy07 9 лет назад

OMG SUCH A SEXY VOICE

@jjanjell 10 лет назад

you make this soo easy! thanks a bunch!

@TheMisVee 10 лет назад

Thank you for this tutorial. It was really helpful :)

@SharDirirTUBE 10 лет назад

Thumps up! i do like ur way of explaining!

@jonathonboardman9368 10 лет назад

Fantastic tutorial! Thank you very much!

@justasingledronevideo2583 9 лет назад

This was SUUUPER helpful. Thank you!!

@JimNagle87 11 лет назад

Her voice :3 I'm in love...

@OneSwaggBelieber 10 лет назад

anyone else find her voice slightly irritating lmao

@Gurjot9704 9 лет назад

maddi lane she's lisping that's why

@theretardedrollingredneckr746 9 лет назад

maddi lane LOL all the girls thumbs up all the men thumbs down

@rosergm14 12 лет назад

Who Cares about her voice!! She's very explainable.Those of you who are criticizing, don't you all want to understand the problem?. Iam guessing so, otherwise, you wouldnt find help. So, SIT BACK and learn it ( As if you want to).

@YomHus 10 лет назад

I totally master the Hess's Law now

@musicwatcher100 11 лет назад

Thank you so much for the video! I get it now! It all makes so much sense!

@avarnish 9 лет назад

is delta H measured in kj mol*-1

@svetussik1 11 лет назад

Thank you so much for this amazing video, very helpful, I feel that I'm ready for Chem exam

@Harrison1234129 10 лет назад

talk dirty to me girl

@A2Kaid 11 лет назад

At 4:58 how did 2O_2 change to 1O_2? You did not explain that miraculous change...

@HeraTWolf 10 лет назад

You're chemistry tutorials r a big help! I have been able to comprehend everything i have learned in my chem college course, and yur tutorials make it a cinch to learn the material!

@HeraTWolf 10 лет назад

whoops i meant "your", not "you're"

@kelpchips7725 10 лет назад

her lisp thing hurts my ears. its like a high pitched "s"

@Fonzoozal 9 лет назад

This made no sense in honors chemistry but I totally get it now! Thank you so much!! And I know the comments below already said you have a very nice voice but it is so soothing. Perfect video.

@Tiera44 10 лет назад

wow thanks so much! so helpful!!

@alyssadanielle2410 10 лет назад

Thank you so much for making this video! It really helped with my homework & you have a calm slow voice its perfect!

@paulistasy2720 10 лет назад

Very Helpful, good job.

@jmoreland4 9 лет назад

Really well explained, Thank you!

@vahanaivazian419 11 лет назад

Thanks girl, you explained it very well. ;) gotta know this for the SAT subject test.

@alex84698 9 лет назад

I dont get something from the second ex. the N2 is only once in the three equations too. can I strart modifying the quations with N2 instead of N2O5

@awyongyuyu3250 10 лет назад

this helps a lot! thanks!!

@alex84698 9 лет назад

I also dont get why the last equation is flipped on the last exercise I NEED HELP!

@ThePeacefulmuslimah 10 лет назад

the voice is so disturbing! but the video was good

@JosephMts2 10 лет назад

Why did you round, 696.4 kj to just 696?

@camerontrivett1826 9 лет назад

.4 rounds down...just a rule of maths

@moonstruck-swede 12 лет назад

Very effective and helpful!! Thank you so much!

@mazinnasralla2036 9 лет назад

Good examples. A little harder than the straightforward examples I have seen.

@sylvia13 12 лет назад

I only disliked this video because I hate chemistry. Nothing personal.

@A2Kaid 11 лет назад

Never mind I understand now, you subtracted 1 mole of O2 from the products side on the reactant side making 2O2 into O2...

@nadeemhussain8194 10 лет назад

i cant concentrate the Ss is killing my ears...too closee to the mic

@JayaSaputra 11 лет назад

thaaaaaaannnnnnnkkkkkk you so much...!!!!!! THIS IS REALLY HELPFUL... :D ALL CRYSTAL CLEAR NOW.. I LOVE YOU,,,, :*

@saurabhmohan994 11 лет назад

thumbs up if you came here bcoz of the SAT SUBJECT TEST

@meerak360 9 лет назад

is she blonde ?

@justanotherdudefosho8274 11 лет назад

@LiLSwaggySwagg the equation of that value is reversed and doubled. therefore the value is now positive (from a negative value, due to the equation being reversed) and 2 times the value for the equation to match the ratio of moles of the equation which we are tryning to find.=D

@azanlund364 9 лет назад

Love your voice

@mlevariomlevario1217 10 лет назад

most helpful video thank you so much!!!!

@Yasiqannati 12 лет назад

HAHAHAH all the comments are about her voice.. woah :P

@nanouaksel6527 9 лет назад

Thank you :)

@camerontrivett1826 9 лет назад

She sound like she is explaining it t a baby and it does not do well for her

@spaggs111 12 лет назад

love all your videos! My chem teacher is from India and i can't understand a word of his lectures! I would be screwed if not for your videos(and others here on youtube!)