Exothermic

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donnanguyen1d
Posts: 64
Joined: Fri Sep 29, 2017 7:04 am

Exothermic

Postby donnanguyen1d » Tue Jan 23, 2018 7:59 pm

how come when a system's temperature increases, it mean that it is exothermic? wouldn't be endothermic since its temperature went up meaning it absorbed heat?

Ryan Sydney Beyer 2B
Posts: 82
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Re: Exothermic

Postby Ryan Sydney Beyer 2B » Tue Jan 23, 2018 8:32 pm

When a reaction feels cold then it is endothermic since it is taking in heat for the reaction. When a reaction is exothermic then it feels hot because heat is being released from the reaction.

Cristina Sarmiento 1E
Posts: 52
Joined: Wed Nov 16, 2016 3:02 am

Re: Exothermic

Postby Cristina Sarmiento 1E » Tue Jan 23, 2018 8:58 pm

An exothermic reaction releases energy, which means that heat is also being released, causing a rise of temperature.

Alex Nechaev 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Exothermic

Postby Alex Nechaev 1I » Tue Jan 23, 2018 11:09 pm

If a system's temperature increases, that means that heat is being released from the reaction to increase the temperature of its surroundings. Don't think of the system itself as the reaction, but rather as the surroundings of that reaction whose change in temperature determines whether the reaction is endothermic or exothermic.

Phillip Winters 2F
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Joined: Fri Sep 29, 2017 7:05 am

Re: Exothermic

Postby Phillip Winters 2F » Wed Jan 24, 2018 12:18 am

The release of heat in an endothermic reaction causes the temperature of the surroundings to increase, whereas an endothermic reaction absorbs heat, thus decreasing the temperature

Josh Moy 1H
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am

Re: Exothermic

Postby Josh Moy 1H » Wed Jan 24, 2018 10:34 am

for an exo reaction delta H is always negative implying the release of heat (thus the reaction is warmer)

RohanGupta1G
Posts: 34
Joined: Sat Jul 22, 2017 3:00 am

Re: Exothermic

Postby RohanGupta1G » Wed Jan 24, 2018 12:18 pm

As others have said, the reaction releases energy causing the surrounding area absorb the energy and feel warmer .

Shanmitha Arun 1L
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Re: Exothermic

Postby Shanmitha Arun 1L » Wed Jan 24, 2018 1:23 pm

https://www.youtube.com/watch?v=eJXL0IrbtqE

This video gives a good, simple explanation of endothermic and exothermic reactions.


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