Specific heat and latent leat of fusion and vaporization | Chemistry | Khan Academy
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- เผยแพร่เมื่อ 24 มี.ค. 2015
- Defining specific heat, heat of fusion, and heat of vaporization. How to calculate the amount of heat to change the temperature of water and the energy required to change for a phase change.
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I can't stress this enough, but these videos is the reason why I have a 95% in my science class.
You are Mega amazing! Your videos are clear, concise, not fast, not slow, fluent and well structured. Your voice is soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo perfect for a tired student! not soft, not loud ! Sal must be proud of you!! Please do more chemistry and physics videos !! Science needs people like you who are perfect speakers!!! Please !! say your name :)
sounds like a sext
meh LMAO
where did he get -17415?
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THREESOME MUCH ? ;)
I am totally amazed.I have been struggling to understand latent heat from last 15 days.I did not know how easy it is!!!!! All credit to YOU.
Now I can finally say yes when my dad asks: ARE YA WINNIN SON?
I like this tutor!!! Perfect speech! you should make more video!
Thank you, oh my god. Online classes are way too difficult if it weren't for you.
holy sh*t my chemistry teacher (and school system) sucked. thanks to this video I was finally able to understand what all these things meant...
still in 2018 this is awesome. I watched a bunch but the clarity and conciseness really solidified this to me
after 8 years you cant imagine how much this video helped me thank you sir
THIS IS AMAZING!!! I have had this explained by my teacher and my tutor and you explained it in a way that filled in all the gaps!
Graph made it easy at the end. Nice One.
I can't thank you enough. I finally got the concept of this. Qc+Qw=0 makes so much sense than the one my teacher taught us in school which is -[McCfe(Tf-Ti)]=MwSw(Tf-Ti)
Now I can finally go through my homework smoothly without staring at my paper for hours and hours.
Perfect, much better than my physic class. Thank you!
This was easy to understand, i never understood what 'Lv & Lf' was, and this video taught me, thanks again!
WHat is this presenters name? I love his voice
+Michael Clark description at Khan Academy says that his name is David SantoPietro
+Michael Clark some of his physics videos are like raps.
I love that man
powerful explanation clearing all the doubts......THE BEST!!!!
thank you sooo much, i missed last week of my physics class because of theatre, prom and like the eclipse and i came back and he had taught like, from momentum to thermal energy 😭. good lord.
Super super helpful and clear!!! Thank you!!
Your videos make so much more sense!!
You are so good! Great Help! Thanks! 👍
excellent!!! thank you
MIND BLOWING filled in all the gaps and is understandable
Superb explanation. Thanks
Great video! Thank you!
Thank you i had a physics exam and this helped
Many thanks. I have a physics exam tomorrow and this helps allot. Sub and like. This really clear video than the others.
It helps a lot
Nice explanation 👌👌
wow i try to understand this specific thing in scholl for 1.5 yrs and still blur this video makes it looks very easy
simple and Straight
In the last problem that you did are you suppose to add all of the Q values in the end? (oh wait I answered my own question you do! Thanks for the video!
I determined the same thing: add up all the Q's. But I am not 100% sure.
Do you just add all of those values at the end?
brilliant video
wao i really freaking easy to learn, i mean how you teaching, yea 💯 sir
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That was a workout!
Excellente
You are the best physics teacher I have ever seen
Thank you so much 🙏
I really like this guy
Thanks for Thai sub.
Damnnn. A1. Thanks! Hope I remember this for my quizzzz. ;(
How did the quiz go
Thanks so much :D
14:11 What unit would the integral of that graph represent?
Tysm i have an exam tomorrow hopefully it goes well
thank u sooooo much
In order to do the heat of vaporization/fusion, will I always need to calculate the specific heat first?
Very very veryyyy well explained...tysm😍
That was well explained and presented. Thank you!
I'm curious about 1 thing.
Let's say you boil 1 Kg of water at sea level. How much more energy does it take for that steam to to lift it 300 meters?
excellent 👍👍👍👍
i dont want this guy to die
Thanks m8
Good
thanks
But aren't you supposed to use Kelvin? Great Videos by the way, your channel has given me an A so many times I lost count :)
Lena Petrović The units are going to be canceled out because you will change the C in McAT like the R in PV = nRT. Kelvins will cancel out with C-Kelvin and Celcius will cancel out with C-Celcius. But I also think Kelvin is more international and makes more sense.
The videos r great but just one thing it should be 2 litres of water not 2kg of water
most beautiful educational video i've ever seen, please do more videos on heat
Nic voice
I think he meant the amount of heat require to turn solid into liquid for heat of fusion, not the other way round
perfect i understood . thank you very much
so it is the sum total of all the energies at the end correct?
+khanacademymedicine there is a tiny mistake at 14:19 - when David was calculating heat of vaporization (pink Q), he wrote 2,260,000 J/kgC -- there should be J/kg :)
Greetings from KA Polish translation team ;)
PSPFDGhost Yeah, you are correct there...
Why is the specific heat for water different because in my book it says 4180 does the scale temperature effects it?
omg i love you :(
8:14 How did this final temperature come out?
Thank you for making this video 👍👍
Question, how much joules would it take to vaporize 1kg of water into water vapor, in 1 second.
can we take specific heat of water as 4200J?and the video is very clear!!thanks
in my school it uses 4200 just to make us easy to memorize it.. but to be more accurate use the definite specific heat
Cool video, but you have been writing Temperature that is in K(KELVIN) in Celsius degrees... If you already do that, at least write theta not T
I don't understand how you got 17415 and 167440. Can you please explain?
Hershelle Wright he worked it out with out the change in temp for both
what about steam to liquid?
Amazing explanation
Wow
how you do it when your water is already at 100 c?
Calculate the heat change in calories for vaporization of 30.0 g of water at 100 ∘C
I love u so much
The specific heat (Yellow) is 2010 J/Kg C or 2010 KJ/Kg C
Do you not need to convert kilograms to grams?
Video at 2x ... Like he's rapping😂
awesome
Very helpful
How far does one need to scroll down to find a comment about the 'latent leat' in the title?
What happens when you have positive specific heats and negatives? eg. above freezing specific heat is 3.6 and below freezing is 1.88 . how do I factor this in? and also when the freezing point is not at 0? say the freezing point of apples is -2.3 degrees celcius
I can't understand Your question is Half
We've learnt that the specific heat capacity of water=4200J/kg°c
the earth is an oblait spheroid
Man, it literally takes around 25 million joules to heat an ice to steam
he almost went aggressive at the end
My head hurts..
Shouldn't it be 90-Tf in the first example as Tf is definitely < 90°C. Pls someone tell me.
No the ice's cooling down so the temperature (Tf) drops by 90 degrees (Ti)
I feel like I've been lied to by teachers because I was taught that water has a specifric heat of 4.186 but everyone keeps writing it without the decimal point.So of course I get a completely different answer. What is the truth?
4.186 is the specific heat of water in J/g⁰C, but this equation uses J/kg⁰C, so if you convert it, it equals 4186J/kg⁰C
at what age do people of your country learn this concept ???????????
in India we learn at 13 years old
5:51 wtf how did you get those numbers
He just multiplied the equation above he multiplied q for the object with the mass times specific and change in time and adds q mass times specific heat and change in time
Online school ???
193.5 wat is that number
And we are losing the polar ice caps at what speed? 😭
should Qsubc should be negative?
angry pepe cancer Yes and no. The Qsubc is a unknown so it can be positive(like water) or negative (like copper) but, in this example, it is negative.
I'm just gonna come out and say way over my head,.
Isn’t it 4.184
I'm literally more confused after I watched these videos than I ever was before I watched them! I suffer from ADD and I literally cannot focus on his monotone voice and retain anything for long at all, because he literally puts me to sleep with the sound of his voice. 1/2 way through his videos I wake up and go WTF was he talking about?!? I'm totally lost!
where did the -17415 come from?
Vanessa Escalera from calculation
But I'm still confused as to what's the difference between latent heat and specific latent heat
Specific heat is the amount of heat required to raise the temperature of a substance a certain amount. Latent heat is the amount of heat released during a change of state
latent heat is just amount to get liquid to vapour(varies from mass to mass, more mass=more latent heat) but specific latent heat is mass specific and it is like heat required to get it to steam per unit mass. = heat required/mass
No wonder pasta takes so long