Calorimetry Concept, Examples and Thermochemistry | How to Pass Chemistry
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- Опубликовано: 16 окт 2017
- After watching this video you will no longer be in hot water when doing calorimetry questions. This video not only explains how to do calorimetry problems but it also explains what calorimetry even is! Finally, you can stop memorizing and truly understand the concept with helpful visual examples.
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At 5:07 it's supposed to be 36.218 Tf instead of 36.2108 Tf
Chemistry with Melissa Maribel
Calculate the enthalpy of the reaction, (3 points)
2SO2(g) + O2(g) -> 2SO3(g)
given the following data:
S(s) + O2(g) ->SO3(g); H1 = -395 kJ
S(s) + O2(g) ->SO2(g); H2 = - 297 kJ
Hi Melissa
When dividing -440.5752 by 12.5125 I actually got -35.2108 did I do something wrong?
@@gabrielamarquez8934 no you didn't. There is a typo in the video. I did this multiple times and got the same answer
Mam can you take class for physic also .
32.5 × 0.385 is 11.635, and you write 12.5125 .
Is there's something wrong 😕 🤔?
I cannot tell you how much you have helped me!! I am going back to college after 20+ years and DREADED taking chemistry. Got an A on both Exam 1& 2. Dancing for joy!!
you just taught me in less than 10 minutes what my professor failed to do in 2 weeks
My mind is blown you really know how to make the concept so much easier ;A; THANK YOU!!
I am an Indian and I really feel we should have a u tube teacher like u 😍in love with ur voice and way of teaching 😘😘😘😘
Thank you so so much!!! It helped me a lot!
Melissa, you are a saint. You have not only helped me better understand Chemistry and its concepts, but you have helped me gain a newfound confidence as well. Nearly a decade of Depression took a huge toll on my academics. I went from a straight A student who excelled in science to nearly failing all of my classes including science. Attending college as a Chem major was nerve-wracking, but thanks to the help of your videos (and treatment!) I am back to straight A’s and am thriving!! So thank you, Melissa. We all appreciate everything you do. :)
Thank you so so so much. Your videos always help me out a ton ! :)
this is so much easier to learn if explained like this. Thanks so much!!
You are awesome. I learned so much by watching your videos. Thank you so much everything you do .....
I like the simple practical example at the start. I work best by understanding procedures, and the example satisfied that need. It took the place of an avatar who would have asked for explanations. A brilliant presentation
Wow, you just blew my mind. I’ve been racking my brain on how to solve these the way my professor showed us and you just made it so simple! Thank You!! 😭
Thank you so much I learned so much!📚
i had the biggest sigh of relief when i found you taught this lesson. your content is great. Thank you so much
You are amazing! Thank you so much!!! :)
Thank you!! so helpful
It never dawned on me that the two Tf's were like terms, thanks so much for explaining it clearly!
I love you, you're sucha life saver. You make chemistry SO much fun and vibrant, and I realllly like that you are to the point and clear
Aww thank you so much Maryam 😊Happy you like my teaching style & video style 💕
i was worried about my college chem exam but i’m okay now because you’ve got me! thank you FOREVER
This was very helpful for me thank you a lot
Thank you, Professor Maribel
THANK YOU!
Thank you! You made it easy to understand. Can i please ask a question, when do we add the mass of the substance and to water to get total mass of the solution?
Thank you x
omg thank you so much
Thank you so much! Much needed lesson, without it I'd bomb my test.
You know I'm your #1 fan! Thanks so much for the Calorimetry Concept video! Now I don't need to lecture-- instead, my students get to watch your video, take notes, and practice! Thank you once again for making life easier for this ol' chemistry teacher! Keep dancing!
Haha! Thank you Hayley 💕
Excellent
you are a life saviour
Thnxxxxx....uh hve made all my concepts clear.. Thnx once again...ur voice always motivates me..... Thnx once again 😊😊😊😇😇
You are so welcome!
@@melissamaribel my pleasure😇
you the best Melissa 100000000%
Hi! I would just like to know whether there is a difference between using the Big Q and the small q in the equation? For example in computing latent heat Q = mL, it uses only big Q for heat energy, but for q = mcΔT, I have been seeing some use Big Q and others small q. Thanks!
I have a question, how do you distribute? In case you can’t tell, I’m new to chemistry and when I multiplied, I got a flat 524. By the way, love your videos!
After trying out the practice problem myself, I got 43 instead of 50.2. Is there anyway you could explain to me where I went wrong?
In the problem I'm given by my school the specific heat of the metal (NaOH) isn't supplied in the question, do you have a video that goes over how to find that?
My steps are right the my final ans was wrong 🤦🏻♀️ 0.o
How will u calculate enthalpy change if u are given specific heat capacity and heat capacity of calorimeter
In your example, if the substance released the energy should the value of Q is negative?
can you do an example with a phase change? specifically vaporization?
how can i determine the mass of water used in the reaction? note: it's not given in the question
If you use 35.218, then the next step changes to 542.3572 (Your prep people are not staying consistent). They used -440.575/12.5125=-35.21078921*-15.4=542.24632...I caught it, but some newer folks might be confused why the numbers are not consistent. Thank you for all you do to make CHM AMAZINGLY FUN!!
How do you know which one is positive or negative
Seriously...I've been trying to figure this out for two days...and then you appeared. I don't know if it's the colors or the dancing but I understand this so much better than my instructor's videos.
It's probably the dancing 💃🏻😂
I love how she starts with a cup of coffee for an example after I just watched the advertisement for her video to stop drinking coffee.
is this heat capacities for constent volume or for constent pressur
why we use two terms called moloer heat capacity and specific heat capacity
Shouldn't the exercise problem at the end be only 1 Sig Fig because of the 60g given?
Hi so your example is the best one the others use two variables like adding water to water but this one is the most common one asked and is broken down to a newbie level which is great and also these numbers are the exact same of the one im working on for a take home quiz exc pt it's with aluminum and it's Cs of course, the beginning part almost turned me off, you might get alot of people.more impatient than me, just a suggestion to think about, nothing too bad though 😁
Much love from chemistry UIC students!!
Hi there, can I ask why you put a negative sign on the side of the water? It seems that the metal should have a negative sign since the heat is flowing from hot to cold. (Negative sign indicating that exothermic process happened) Can you clarify this?
I have a question if water is gaining heat wouldn't q be larger than 0 aka positive because it's endothermic. It's what is on the ppt from my class.
Excuse my ignorance, but isn't the negative sign in - q water = q metal supposed to be switched or does it not matter? My chem lab book has the negative sign in front of q metal.
edit: I think it may have to do something about the order because the equation in my book goes like this: + q water = - q metal
Hello, I am new here. Thank you very much. it helped me a lot.
I have a problem with the practice question, I did step by step but the answer was different. it was 55.5 Celcius and you have 50.2 Celcius. can you help me?
yes same!!
nails, dance moves and teaching skills on fleek!
Haha thank you! 💁♀️
I wish I had found you sooner!
will the steps be same if initial temperature is missing?
Wait, but wouldn't the negative be for the heat of the metal because its the one losing heat the water is absorbing it?
Could you please explain how to determine where to put the negative symbol? Does it really matter/would you have gotten the same answer if it was -qmetal=qH2O
Either way will give you the same answer, the negative depends on the question, but just know that one is negative and the other is positive and you will get the same answer each time.
@@melissamaribel awesome, thank you!
Hi, I'd like to clarify. Isn't the metal should bear the negative sign since it is the one that releases heat and the water should have the positive sign since it absorbed the heat from the metal?
yes it is q metal gives heat therefore negative...q plus to the water
what is molor heat capacity
Do you have a video for finding molar mass?
Yes search “molar mass Melissa” on RUclips
1:37 Can someone explain why is q metal = -q water here?
What's endothermic and exothermic?
can the same thing be said when finding specific heat? is it just solving for Cs??
You would have to be given one of the Cs values, and only have one unknown Cs.
if you distribute 35.218 to the left side wouldn't it be -10.582? just confused on how you got 36.2108. thanks for the help
Same
please do empirical formula im dying
enthalpy pls!
I agree!
Why divide 12.5? Why not subtract from each side?
Isn't it the other way around? Qwater= - Qmetal because heat is being released from the metal (exothermic) and the water is absorbing the heat (endothermic).
Oh alright! Thank you for the quick reply. I'm getting ready for a final exam tomorrow. This really helped!
Melissa Maribel thank you! It went well because of this video!
Alexia what was her answer? I can't see it and I had the same question
Both work they will give you the same answer, I've seen it written both ways but the main thing to know is that they are opposite signs.
How did you get 0.385 and 4.184 for the first problem?
This is given, this is the specific heat capacity for the copper and water. You typically are expected to know the specific heat capacity of water 4.184, but all others must be given to you.
Ok so I got 35.2108(-440.572÷12.5125 is 35.2108) not 35.218 firstly but that's but I think you know this. But how did you get 36.2108 from 35.2108? Where did the 1.0 come in at the end?Tried a few ways but can't get it. By the way my college referred us to your videos. Your videos are really helpful especially in times like this.
Same. I’m thinking combine like terms mean add +the negative, and the number goes down not up
*in response.. Am i q or your channel q, or am i -q or your channel -q, may be equilibrium, anyway..* Aweeeesome!! and oh how desperate i was for another sample question 😝
How did you get 36.2108 from +45.8 to both sides
& what happened to the -35.218
now i am in CHEM 152... I AM NERVOUSS I HAVE AN 89 in it and this is my second week! do you tutor live anywhere or meet up with people?
I don't tutor one on one anymore but I do have a playlist for Chem 2 that will help ➡️ruclips.net/p/PLytGGifnD9dUBS_c-lV3Z_F1A9D9SDmHp
howd you get the practice answer? i got 10.416 :/
I got this answer too! Did you figure out how to get the right answer? Someone help us :(
All I'm saying is: "You can't have the guaca-MOLE without the ava-CADO!" *Proceeds to throw guacamole into Melissa's face* lmao
😂😂😂
where you get 0.385
Would the metal not be the one that is negative? My professor lectured in a way that whatever is giving off heat will be the negative q and whoever is absorbing the heat is positive. Not sure if she's crazy or what lol
In the example problem you made a mistake when writing the numbers out. Did you confuse -35.218 for 36.2108
Thank you for clarifying, that makes so much more sense. I love your videos by the way!
I think the mistake I see in your calculation is that you wrote -35.218 instead of -35.2108 before adding (after transposing) it to 1Tf. 36.2108 is 1 plus 35.2108, not 1 plus 35.218 (that would 36.218 instead).
Other than that, thank you for this video. I have to admit, the first few times I had to deal with the formula were a struggle. I now understand how to solve with the formula thanks to this.
Chemistry killed my love for science
A 23.9 g silver spoon is put in a cup of hot chocolate. It takes 0.343 kJ of energy to change the temperature of the spoon from 24.5 °C to 85.0 °C. What is the specific heat capacity of silver?
(Answer: 0.237 J/ g °C)
csilver = 0.240 J / g °C
If there is a question like this, why do i need to find the value of the heat capacity when silver's heat capacity is shown and given.....I mean the heat capacity is the amount of heat that can hold in a substance and when the temperature exceed the amount of heat that substance can hold, the temperature rise up by one degree and mass..but how come the heat capcity change when the temperature increase? idk......i have no idea plz share some opinion or answer.....e
Could you show your worked out answer for the end of the video please. I'm not getting your answer and I'm trying to figure out my missed step. thanks
On the answer key you divided by the negative number -251 of thr water. In the video you divided by the positive number of the metal. How do you know which to divide by?
can you do more videos on thermochemistry please
This topic is definitely on my list of videos to make more of this semester!
Where did you get the 105.3???????
At 2:36 you will see that it was part of the original question
you are a GODDESS
Aww thank you Caley 💕
update:i watched this video the class before i had a chemistry quiz and i got a 73 (a lot of people didn’t do well)
Glad you passed it!
update 2:i got the highest quiz grade
I need the title of the break dance song
Here's all the music I used in this video:
Song: Cjbeards - Winter Breeze (Vlog No Copyright Music)
Music provided by Vlog No Copyright Music.
Video Link: ruclips.net/video/PCZQlXCbGpM/видео.html
Always (Vlog Music) by Dj Quads
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Music promoted by Audio Library
ruclips.net/video/jIiE1ezj4cs/видео.html
I wish all my lectures are pleasant and beautiful like you!!!
Thank you!
i got -12.91C im soooo off
After watching this I'm sure I'd be better off watching 20m RUclips lessons than a 2h lesson with my proffesor
very good , are u marid?
Hi I'm super confused about your math at the end
Hey Alexis what part exactly were you confused on?
@@melissamaribel I'm confused on how you went from Tf - 45.8 = -35.218Tf + 542.24632 to the next step. I am confused on the exact math. I tried it over and over again and I got random numbers.
@@lexlovesmovies There was typo that I mentioned in the comments at this part, At 5:07 it's supposed to be 36.218 Tf instead of 36.2108 Tf. That could be part of the confusion.
I feel like I'm stupid bc I still don't get it
I find it funny how many of these youtube videos you're able to watch for FREE are able to help you learn better than the university and profs you PAY to teach you :/
be my teacher 🥺
Who's watching this because they have a test tomorrow?
You are so smart. Can I have your brain
Thank you, You can't have my brain but you CAN reserve it for an hour on my patreon page 😂😂
www.patreon.com/
I still don’t understand this topic frustrates me so much you have no idea doing this makes want to tear my hair out😡😡
chemistry is the most ridiculous science. I feel that its only purpose is making things more complicated than they are. Anybody can learn it, it is just that they love making things more complicated.