Tricky Question: Exothermic or Endothermic?

Published on April 13, 2012 by

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Is this process exothermic or endothermic? Actually, it depends on what we consider the system, and what we consider the surroundings. Every process can be exothermic or endothermic, depending on your point of view.

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  • John Smith 10 years ago

    Wow. Thanks for that. I love the visuals. Very clear & simple. I love this guy. I love anyone who can make things so easy. ๐Ÿ˜€

  • Tuck91er 10 years ago

    This is an excellent video, great explanation and visuals

  • Haris Zafar 10 years ago

    Hey mate nice video but you spelt endothermic wrong 1:12 !

  • JPN 10 years ago

    @Haris Zafar so what? Should we kill him because he made a non-important mistake???? By the way he teaches chemistry he may seem to be an alien but guess what! he’s a human so he can make a mistake but anyways only stupid people focus on mistakes with the size of an atom man try to be different minded and focus on the great information this guy give us I’d love this dude as a teacher in my school

  • tylerxx26 9 years ago

    Hey tyler, i had a question in my biology notes im not quite understanding. “When potassium nitrate dissolves in water, the beaker containing the solution gets cooler. is dissolving this salt an exothermic or endothermic process?”

    i initially thouht it would be exothermic as heat is energy and the beaker is cooler, therefore heat would be leaving. but ive recently been told it’s endothermic and dont understand why.
    thanks in advance for any help.

  • Tyler DeWitt 9 years ago

    that’s a really tricky question! here’s a hint: the potassium nitrate is the system, and the water in the beaker is the surroundings. so which direction is heat flowing? from where to where?

    • The Abcool 3 years ago

      Is it out exothermic?

    • Jake Armstrong 2 years ago


  • Jessica Escober 9 years ago

    your videos are so great,they help me a lot,you should do a video on on equilibrium because I need help with that:)

  • Adiba Chowdhury 9 years ago

    you are incredibly talented, ive learn so much from your 15 minute videos than my teacher’s 45 mintute lessons, we need teachers like you who can actually engage me into the lesson. ๐Ÿ™‚

  • Kiet Luu 9 years ago

    I love the elegant way you present and explain by making complicated things easy. That is the most difficult thing to do. You are a first class instructor. Thank you.

  • Matthew 9 years ago

    Endothermic is spelt wrongly

    • Tinashe Belle 4 years ago

      Matthew I think the word you looking for is incorrectly ๐Ÿค—

  • Kim Ly 9 years ago

    you explained clear and very well. I’m serious. I choose to watch you first over everyone else

  • Nujhat Hossain 9 years ago

    hey love ur vids! quick qeustion, how do i know if something was done ON the system or BY the system?

  • carrot 9 years ago

    after watching 2 youtube videos on this i am basically a god on exo and endo reactions now

    bow down to me, peasants

    • Rohit Dhingra 5 years ago

      no u r still a dumb female

    • Courtney Boxx 5 years ago


    • Zoe 4 years ago


    • Christian Ojeda 3 years ago


  • Maali Pink 8 years ago

    thank you for making this topic easier for me

  • Jean-Henry Seymour 8 years ago

    Will there be any change in endo or exothermic reactions if the quantity/concentration of reactants is changed?๏ปฟ

  • Linda Klein 8 years ago

    thank you thank you! you made my homework soooo much easier!!! you my hero ๐Ÿ™‚

  • M 7 years ago

    btw idk if you know this but your links in the video arent working

  • Nerran raja 7 years ago

    what is the difference between an endothermic process and an endothermic reaction???

  • Joash Casey 7 years ago

    Great video; lol did anyone notice he spelt “endothermic” and “enodthermic”

    • Emanuel zamorano 6 years ago

      yes lol thats why he laughed

  • Joash Casey 7 years ago


  • Heather Marie 7 years ago

    You are terrific, thank you again.

  • Charmaine Czora 7 years ago

    Love you ย – thank you.

  • Rebekka 118 7 years ago

    You make chemistry sound so easy, I really love your videos. You are indeed a true scientist.

  • Erika y Scott 7 years ago

    Hi, I really love your videos ! You are helping me a lot. I would like to know if there are videos about equilibrium expression?
    and Equilibrium molarity? please let me know !
    thanks very much

  • A A 7 years ago


  • thex 7 years ago

    this is so helpful

  • Hella van Stokkom 7 years ago

    Thank you so much for making these videos. They help me so much!

  • Mule Kebede 7 years ago


  • Sophvidz 7 years ago

    your videos are saving my life , mostly my mental state tho , a – levels hey ….

  • Hana Dee 6 years ago

    cool video. …thank you…really helping my 7th grade son

  • Karina Torres 6 years ago

    Thank you Tyler, without you my BA degree would not have happened!

  • Jamie Oliver 6 years ago

    your videos are the best , I’m passing science cause of you. thanks

  • Danielle 6 years ago

    where are the other videos at the end of the video?

  • ahmad sako 6 years ago

    thank you bro, you are the best

  • elijah brown 6 years ago

    it was a dare

  • Oh for Real? 6 years ago

    You spelt endothermic wrong, you Jack rabbit.

    • Oh for Real? 6 years ago

      +Tyler DeWitt ….you

    • nonthapat keawamporn 6 years ago

      +James Counts lol

    • Leo Zhang 6 years ago

      Tyler DeWitt lol

    • Leo Zhang 6 years ago

      Oh for Real? you can respond to me, babe๐Ÿ˜˜๐Ÿ˜˜๐Ÿ˜˜

    • Adam Nelson 5 years ago

      ur fuckin weird.

  • Annie Prince 6 years ago

    Quick question: Does the temperature fall when it’s an exothermic reaction?

    • nimco farah 5 years ago

      Annie Prince the temperature falls when is endothermic

    • The Abcool 3 years ago

      nimco farah but heat is moving in endothermic so temperature increases.

  • Bhavik Shah 6 years ago

    You should be nominated as the best chemistry teacher in the world

    • Hamzah Shafi 5 years ago

      he should win*

  • Yemi Badmus 6 years ago

    you are amazing, Thanks a million

  • Johndoe Mystery 6 years ago


  • Zara!!!!! Nwadibia 6 years ago

    You are an amazing teacher. Thank you

  • Pankhuri Bedekar 5 years ago

    hey tyler,
    would you have any videos covering equilibrium?
    your videos are amazing btw, you really have a gift for teaching ๐Ÿ™‚

  • Bแปฏu Nguyแป…n 5 years ago

    ohhh you make me understand how to know Exothermic or endothermic! i am so happy and i hope you make a lot of video about thermochemistry that i can study from you.

  • Munted Mango 5 years ago

    I love you. You have saved my ass.

  • Mukesh Kumar 5 years ago

    Sir You the best teacher ๐Ÿ‘๐Ÿ‘๐Ÿ‘๐Ÿ‘๐Ÿ‘

  • BEN JAMY 5 years ago

    Your description is simple and clear, very useful, thank U.

  • Richard Alsenz 5 years ago

    So this is the book keeping method energy in chemistry, as the debits and credits are in accounting? boo:?)

  • Anjali Baunthiyal 5 years ago

    Mujhe apki video achhi lgi..easily way mei smjhte ho..

  • Shubham Jha Vines 5 years ago


  • vinolin moodley 5 years ago

    Vote for tyler best chem teacher is the world

  • Princess Victoria 5 years ago

    tyler would u have a vedio …about neutralization and precipitation reaction?and also the activity series of metals..i mean metal hydroxide,metal carbonate,metal nitrates ?????plzz help me out in this topics..!!!!.exams are near!!!๐Ÿ˜ง๐Ÿค’๐Ÿ˜“

  • bangtan 10/10 5 years ago

    props to you for helping me up my chemistry grades through your clear explanations

  • peace world through in side 5 years ago

    Thank u so much for u. i rarely comment any one your really good to teach in simple way.

    I need on video about Differential scanning calorimetry.

  • AAYUSH CHOPRA 5 years ago

    the spelling of endothermic is wrong

  • Lamiek ใ€ฝ๏ธ 5 years ago

    you are Amazing, saving my life thank you!

  • Chang Boon Yang 5 years ago

    Great teacher wow

  • nisar haider 5 years ago

    you should get a nobel prize in teaching chemistry
    you are such a good teacher that i have understood the difference just in 3 min
    which i was confused for the last 2 weeks

  • Duckman 5 years ago

    1:16 – “It depends on our point of view.”
    From my point of view, the water is evil!

    • Blueblueberry 3 years ago

      “I don’t think the system works”

    • M & M 3 years ago

      No the flame is evil cuz the flame bully the water

  • leyna an 5 years ago


  • xBlueBerry22 5 years ago

    I usually watch it fully first and rewatch it by reading, I realized that he spelled Endothermic as Enodthermic

    • Parveen Akther 4 years ago

      xBlueBerry22 try to look at the positive side please. he worked hard to make this video for those who has difficulties to understand this particular topic and ofcourse you are one of them and am sure it helped you alot so plesse appreciate his hard work rather thn complaining.

  • hiimadonutya 5 years ago

    I love you, you make me love the chemistry

  • Jasne Gavileni 4 years ago

    I wouldn’t be scratching my head out often if you are my teacher , thank you so much!

  • sara alhadabi 4 years ago

    thanks ๐Ÿ‘๐Ÿ˜Š

  • Hassan Radi 4 years ago

    as expected from the best teacher in the world……sir

  • Cara Baldini 4 years ago

    wonderful! Thank you

  • Fatma Hadari 4 years ago

    why all the videos that i watch it from 5 years …. am i so late :/

  • Anthony 4 years ago

    After about 5 hours of trying to understand the difference, Tyler Dewitt saves the day in 1.5 minutes (playback speed x 2)

  • Taylah Scothern 4 years ago


  • Middle india VINES Blogg 4 years ago

    I am very intelligent.far more than you .I have am IQ of 157.

  • Talha Hasan 4 years ago

    can the glass or the beaker shown in the video, be the system?

    • ali naseer 3 years ago

      wat za fack

  • Abdul-Hannan Ahmad 3 years ago

    U spelled endo wrong Bro ๐Ÿ™‚

  • tron944 3 years ago

    and if the system is the beaker container, it’s both because it’s accepting (endothermic) heat from the flame and transferring (exothermic) to the liquid, right?

  • EJ Greene 3 years ago

    OMG! Thank you for explaining this I thought I was going crazy!

  • Maha Elkiki 3 years ago

    you are great

  • Elias Gaolatlhe 3 years ago

    i love the demonstrations that really helps me to understand better ……

  • Dawa Sangmo 3 years ago

    thank you

  • vaibhav gaikwad 2 years ago

    Hey! why did you stop making videos?

  • Matthew Brown 2 years ago

    I think a lot of people might end up here because of the Corona Virus

  • Trunnn 2 years ago


  • Annie S. 2 years ago

    So if a cup of hot water is sitting at a table and cools down overtime b/c it gives off heat to the surroundings, is that an exothermic reaction if we consider anything but the hot water as the system?

  • Shivute Augustinus 2 years ago

    am gonna embarrass my teacher!!!

Comments are closed.