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November 01, 2025, 12:08:33 pm

Author Topic: temperature rise/fall confusion.  (Read 728 times)  Share 

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nemolala

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temperature rise/fall confusion.
« on: September 04, 2011, 07:36:11 pm »
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during endothermic reactions, energy is absorbed as bonds are broken.

soo when an endothermic reaction occurs in an aqueous solution, is the temperature rising or falling?

what I'm getting confused about is, wouldn't the water itself increase in temp as its absorbing energy? or are the questions referring to the environment..as in the atm...? if so wouldn't then the temp of atm be decreasing?


i know dumb question  ::)

Greatness

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Re: temperature rise/fall confusion.
« Reply #1 on: September 04, 2011, 07:50:54 pm »
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If an endothermic reactoin occurs in the test tube, it goes cold because the enregy is absorbed. Likewise an exothermic reaction makes the test tube warm/hot, as the energy is released.
You pretty much answered your own question :)

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Re: temperature rise/fall confusion.
« Reply #2 on: September 04, 2011, 07:52:24 pm »
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This is my understanding of it but I'm not sure if this is entirely accurate.
In endothermic reactions, more energy is required to break the bonds in the reactants than needed to form the bonds in the products. So as energy goes into the molecules, it becomes energy stored in the bonds and no longer kinetic energy of the molecules itself. Temperature is related to the kinetic energy of the molecules, as it is the average kinetic energy of the molecules in the solution. So as the kinetic energy is converted to be stored in the bonds, the temperature will decrease.
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