Endothermic and Exothermic Reactions

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033 - Endothermic and Exothermic Reactions
In this video Paul Andersen explains how heat can be absorbed in endothermic or released in exothermic reactions. An energy diagram can be used to show energy movements in these reactions and temperature can be used to measure them macroscopically.
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Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
"File:ThermiteReaction.jpg." Wikipedia, the Free Encyclopedia, August 28, 2013. en.wikipedia.org/w/index.php?t....
Haacken, User: Herbert. English: Instant Cold Pack, March 15, 2012. Own work: Herbert Haacken. commons.wikimedia.org/wiki/Fil....
Lucasbosch. English: Low and High Form Beakers, October 19, 2011. Own work. commons.wikimedia.org/wiki/Fil....
Psychonaught. English: Mescaline Extracted from Cactus, 100% All Natural., [object HTMLTableCellElement]. Own work. commons.wikimedia.org/wiki/Fil....
Werneuchen. Thermometer, February 2008. Own work. commons.wikimedia.org/wiki/Fil....

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9 июл 2024

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Комментарии : 189

@bobstrongbad 10 лет назад

Your videos, along with many others on here, are exceptional. The explanations are remarkably clear, concise and provide a good range of examples. What people on RU-vid are teaching me in 10 minutes my teachers can't do in 6 hours of class time. Thank you for making these videos.

@leamestermann4656 7 лет назад

this genuenly saved my life, i have my chemistry exam tomorrow and i was so close to giving up. THANK YOU!!!

@1ZazaTree 4 года назад

i learned more in 5 minutes than this whole half of my school year

@shafeymushtaqch1493 3 года назад

Try Studying

@fink7692 Год назад

@@shafeymushtaqch1493 No

@Alastor__HH Год назад

@@shafeymushtaqch1493 NERD ALERT

@Simple-2- Год назад

@@Alastor__HHikr

@lunarathod8887 9 лет назад

It's sad because this guy teaches better than my Bio Honors teacher

@chinapascual6697 5 лет назад

same

@danielalexis3437 3 года назад

this video was very help , now i understand 100% about Endothermic and Exothermic Reactions , i will make sure to recommend this video to my friends and family .

@neelia3435 9 лет назад

Thank you for your work! Whenever I don't understand my Biology or Chemistry class I can always count on your videos! Your the reason why I passed my science classes at all!

@boofang10 4 года назад

TQ Mr Anderson !! Very straightforward & clear-cut explanation to differentiate Endothermic & Exothermic reactions , together with examples & energy profile diagram !! 👍🏻👍🏻

@SLASHERamc 8 лет назад

Thank you!!! My teachers suck!!!

@melissapremo179 7 лет назад

Omg same so does mine.

@SLASHERamc 7 лет назад

meilssa premo At that time- it was her first time teaching chemistry, in english!

@jessicab7005 9 лет назад

Thank you for making me understand in 5 minutes and not a 75 minutes long school lesson XD

@abigailben7671 8 лет назад

+jessica Bignall I know what you mean

@chomeo6797 3 года назад

Thank you for making this! I learned a lot in the video.

@chloemathias9864 7 лет назад

Thank you, this was very helpful; I learnt more in this 4 minute video than I did in my hour long chemistry lesson :)

@duncanmckillop2290 10 лет назад

If you are going to use the cold pack as an example, you should also explain which physical changes are exothermic and endothermic and explain to them the difference between water freezing (exothermic) and a cold pack feeling cold (endothermic).

@jackvatcharat7631 10 лет назад

Wow! Thank you for giving me a chance to watch. :) Your subtitles (captions) help me a lots!

@nerdcraig4696 3 года назад

Best intro on youtube

@IcturewindowBlogspot 8 лет назад

I'm a french speaking one but it has been easier to understand the video in English. Good job!

@juliestace1883 10 лет назад

Thank you! Very helpful graphics!!!

@maddie6363 10 лет назад

yesss! omgg I was literally looking for this just yesterday! thank youu so much. my teacher clearly doesn't know how to teach...

@ripmamba2731 7 лет назад

I learned more in 4 minutes than in 2 50 minute classes, wow you're amazing.

@JudithAbergosDesertPinesHS 2 месяца назад

this video was clear and easy to understand

@regretnightling 10 лет назад

I just learnt this topic today and had no idea what my teacher was trying to say. Your explanation was so much better. Thanks :D

@andrew6377 9 лет назад

thank you so much you made this very simple and easy to understand

@samdedmon8674 3 года назад

THIS IS POG. subbed

@fatmaelhadari2236 6 лет назад

may be so late but: i don't understand...the exothermic reaction liberate the heat energy which means that the system will decrease in the temp and the surrounding will increase but when we measure by the thermometer the temp. of the chemical reaction for example as if it is exothermic reaction (Fe2O3 + 2Al --------> 2Fe + Al2o3)the thermometer tells us that the temp. increase although we have just said that the system will decrease not increase ,the same thing happen in the endothermic reaction....so how?! #bozeman science @bozeman science

@catz1235 9 лет назад

Nice and simple. Thank you!

@psychedelicmermaid2 10 лет назад

Very Helpful.Thank you!

@hadeerrashad5486 6 лет назад

Excellent explanations! Thank u so much!

@abigailben7671 8 лет назад

I want to say thank you! I don't know why but this helped me understand endothermic and exothermic WAYYYY more :)

@Sol-01 6 лет назад

I don't understand 4:03, if it is consuming heat from the surroundings wouldn't that mean it would be heating up?

@Keith_Mikell 8 лет назад

Wow. This channel is great

@fishbytecast5693 8 лет назад

Really helpful thank you for that informative videp

@IamGonzo 3 года назад

My bio teacher with a doctorate isn’t even teaching us we just have to search videos and hope for the best

@impressivetelevision9729 8 лет назад

thanks for nice presentation!

@heatherleisure9217 9 лет назад

You saved my life. I was just sitting here thinking about hanging myself because my textbook's explanatory power is bankrupt and so I couldn't fit the facts together into a seamless process.

@prakhar7978 3 года назад

@@ronanpflanagan shut up

@fishythefish7984 3 года назад

@@prakhar7978 ????

@prakhar7978 3 года назад

@@fishythefish7984 i said shut up can you not read

@fishythefish7984 3 года назад

@@prakhar7978 I said "???" as in why or what are you referring to. why are you such a rude piece of shit. fuck off dumbass. nobody needs your negativity. don't reply, bye

@kabirvohra9989 5 лет назад

thanks so much this was really helpful

@ryanandlewis2 11 месяцев назад

very good

@titi14fan 8 лет назад

Love u mr Anderson thaaaanks ❤️

@PM-ge5bj 8 лет назад

Agh! Thankyou. I have a test on this tomorrow!

@MohdAzylee 8 лет назад

So helpful thanks!

@AltairZielite 9 лет назад

Now I'm curious. What if you have what should be an endothermic reaction but separate the process from any surroundings?

@lillyg6632 9 лет назад

Thank you this channel helps with my revision :)

@annabethchase7743 3 года назад

Thank you😁

@papa_cookies8405 Год назад

Sensational 🤞

@Simple-2- Год назад

Man City for life!!!!!!!!

@wuddleduddle2437 9 лет назад

Great video

@mahshadash3758 9 лет назад

Thanks!

@fabianjoule 8 лет назад

good stuff

@superdroid22 9 лет назад

thanks man! That really help me me A LOT

@godzillasantos5190 10 лет назад

So easy to understand my friend :D

@rafalfalih2957 5 лет назад

In an assignment my teacher is asking of me to make a graph that has the specific amount of energy. How could you find out how much energy is in the reactants and product?

@joeyhaley2988 7 лет назад

thx that was really helpful

@jacobguthrie6231 7 лет назад

Well, well, well, Mr. Anderson.

@FulfillingYoga 10 лет назад

thank you so much :) could you please make a video on pka and pkb/ Ph Buffer systems

@atticusgaming.rp.925 7 лет назад

Thank You for helping me by explainig

@Emily-qq3my 4 года назад

Thanks a lot 😊

@shayanhussain7802 7 лет назад

Best Explanation ever

@Nice69 10 лет назад

Nice video.

@ZickTube 4 года назад

That was helpful to my science work today, it's due tormorrow.

@ExothermStudios 8 лет назад

Thanks for the tip now I fully understand what my name means!

@ajlane8591 7 лет назад

thank you for being better than my teacher :"0

@dilanaslan2699 6 лет назад

It was helpful thanks

@evolgrim4139 5 лет назад

thank you so much you saved my ass in science lol much love and i wish you were my teacher

@TheCanadiangirl4 9 лет назад

Thank you, it definitely was helpful

@liveyczaraligno2475 4 года назад

In basing the temp at the last example ... shouldnt an object get hotter if it absorbed energy?(endothermic)

@deadluk3 10 лет назад

cheers mate :)

@demitrilowe564 10 лет назад

thank you

@zacharymiller1452 6 лет назад

Surprising how he can explain something that takes my teacher 5 DAYS TO EXPLAIN

@devasri_ 10 лет назад

holy crap, you're a life saver/

@mariaorsic9763 6 лет назад

excellent!!!1

@carrickmaley1457 8 лет назад

veeery helpful

@landom8006 3 года назад

you should make merch

@59ecs 5 лет назад

i just love the comments it is really funny

@rachelaronov2126 7 лет назад

thanks!!!!!

@claudekennedy7855 8 лет назад

Your videos are SO helpful. THANK YOU SO MUCH. It's greatly appreciated by students everywhere.

@jean-henryseymour6927 10 лет назад

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

@doggosgobork525 5 лет назад

There will be no change, besides the ammount of energy emitted

@ranadr2788 9 лет назад

Thank you you really halp me 😍

@KazumaAkuma 10 лет назад

Thank you so much sir. I am crying because of this work of yours.

@mayaraafat 3 года назад

I love you

@sadiyanooreen2541 10 лет назад

thank u sir

@janieli 3 года назад

At the end of the video, if you're decreasing in energy, doesn't that mean you lose energy? Like if the temperature decreases, there is less kinetic energy... so why is it endothermic?

3 года назад

i swear i have the same question and nobody answer it

@janieli 3 года назад

@ hey! i think i asked my teacher after and he said that i’m endo/exo questions are relative so it’s technically exo for the water as it loses energy but as for the reaction it’s endo bc it gains the energy that the water loses

@TRT-ds9bh 9 лет назад

geez...... I wish I could do that to uranium, if u get what I mean

@gopher2345 9 месяцев назад

Please come to Palos Verdes high school and be my Biology teacher!

@Tylerstrodtman 4 года назад

I still don't understand how if the reaction consumes heat, that it gets colder. Am I wrong to equate heat and energy?

@islamicreminderswithyahya2585 4 года назад

Tyler Strodtman the reactants gain heat from the surroundings but the surroundings loses it as a result. It’s like me saying I gave someone money. He gained it, I lost it. Since that is the case, the reactants gain energy as heat from the surroundings and the surroundings loses it, making it cooler.

@lindatinamorales 10 лет назад

Great!!:}_

@flynnkay 7 лет назад

for the last example, WHY does it consuming HEAT make it *colder* that makes no sense it consumed heat so it should be warmer

@easytheories 7 лет назад

GreenShot yeah why's that????

@TMPChem 7 лет назад

Great question. Typically, one implicit assumption in these calculations is that the process occurs in a closed system at constant temperature and pressure (as is approximately the case if the reaction is exposed to the atmosphere). If a reaction occurs which has a negative enthalpy change, then the temperature will tend to decrease. As the temperature decreases below that of the external environment, heat will flow *from* the surroundings *into* the system, until the system once again reaches the temperature of the environment. The amount of heat necessary for this to occur is equal to the magnitude of the enthalpy of reaction. Since heat flowed *into* the system to re-balance the temperature, we would describe this as an endothermic process (the prefix endo- meaing "within").

@pwazi4729 7 лет назад

The channel explaining it made it slightly more complex than it needs to be. Enthalpy is a measure of heat. It is impossible to measure the direct enthalpy of a system (atoms making up a compound) and thus you measure the temperature of the enthalpy of the surroundings. As heat is being absorbed from the surroundings, the temperature is colder.

@TMPChem 7 лет назад

Agreed for the most part. Heat is being absorbed from the surroundings into the system. This lowers the temperature of the surroundings. The reaction vessel (which is cold) is part of the surroundings. The enthalpy *change* during a process (the reaction) is equal to the heat absorbed *into* the system (if it the process takes place at constant pressure). It certainly is very difficult to measure the (absolute) enthalpy of a system, but it's much easier to measure / calculate the heat of the reaction from the temperature changes of the surroundings.

@rhys.williams7194 7 лет назад

My teacher is shit, so this helps a lot

@randyjara5861 2 месяца назад

He is good

@kailees3152 8 лет назад

Is there a decrease In temperature for an endothermic reaction?

@lavenderminte5416 4 года назад

Yes

@kemarcgriffith2512 7 лет назад

yes

@zacharymiller1452 6 лет назад

Bozeman is a nice town

@jonwilly2 7 лет назад

i wasnt expecting my name in this channel

@Lolo99pineapple 10 лет назад

yup I got an A :D

@JasonLee-ei5iw 10 лет назад

Congrats

@shaheduddin1189 7 лет назад

In exotermic heat realeased at product side or not because f less energy

@mrmuzo4952 10 лет назад

Very Helpful, More on Science Please

@camilamurillo466 4 года назад

Mr, I do not understand why if the system receives heat in an endothermic reaction, why does it become colder. (As you explained in the last part of the video.)

@MwlGano 4 года назад

The mixture is a system and the beaker is the enveronment. If you touch the beaker it becom colder bcoz heat is taken by the system. Exothermic becom hot coz the reaction produce heat and supply to enveronment. Heat absorbed is stored as chemical energy in chemical bonds formed,so it's not necessary to become hotter.

@camilamurillo466 4 года назад

@@MwlGano Thank you so much!!!! Your explanation was very helpful.

@prakhar7978 3 года назад

Kuper?

@shafeymushtaqch1493 3 года назад

1:16 Macroscopicly

@asdfghjkl45245 10 лет назад

why is the last reaction endo-thermic?? if exo-thermic is heat given out to the surroundings, doesn't it loose heat so it becomes colder?? sorry for the confusion

@maximedfdf 10 лет назад

It is an endothermic reaction because it is consuming heat from the surroundings. If you burn wood, for example, you "use" the energy in the wood to "give" thermal energy (the fire) and radiation energy (the light) to the environment. So, this is an EXO THERMIC reaction. Let's say you have solid ice. When you make it hotter (by holding it above a fire for example), the ice will melt and become water. So basically you "give" energy from the environment to the system. So, this is an ENDO THERMIC reaction. And when you put the water in to the freezer, the water will give it's heat to the environment and become ice again. So, this is an EXO THERMIC reaction. If you're torn between EXO or ENDO, then think whether the object gives energy to the environment or gets energy from the environment. I hope I helped you!

@TypicalMrGamer 10 лет назад

I know what you mean. In the image you're thinking he was measuring the temperature of the reaction itself, but essentially he's measuring the surroundings (the solution in the beaker) because it wouldn't make sense to measure the temperature of the reaction itself. And like what the person above me explained, the reaction is endothermic because it takes heat from its surrounding (the solution in this case) to process it itself, and therefore, the solution in the beaker is colder than what it was previously.

@shaeseavey9000 2 года назад

My teacher assigned this video with a paper like 4 days ago I still don’t wanna do this

@milkywayandbeyond 8 лет назад

I know that during an exothermic reaction, the temperature of the surroundings increases due to chemical energy being converted into thermal energy (and the reverse for endothermic reactions), but does the temperature of the system (the products and reactant molecules/atoms themselves) also experience a change in temperature, or just a change in stored energy? Thanks a lot for the help.