Endothermic- decrease in kinteic energy, increase in potential energy?????

[atlanta213]

Advertisement - Members don't see this ad

Hi!

Does endothermic decrease in kinetic energy and increase in potential energy?

Thanks

 

[atlanta213]

anyone?

 

[nixon13]

So an endothermic rxn uses heat (solid to liquid) so the kinetic energy will be increasing since the molecules are in faster motion. An exothermic rxn (gas to liquid) releases heat and therefore the particles are moving slower so the kinetic energy is less. As for potential energy...Im not sure.

 

[nixon13]

actually potential energy is energy at no motion (kind of) so in an endothermic rxn you will have greater kinetic and less potential. Vice versa for the opposite.

PS- Im drunk so if im completely wrong, blame it on the Miller Light.

 

[atlanta213]

hmm.. I think it is opposite of what you said.. anyone?

 

[MattEvers]

The terms endothermic and exothermic stem from the relative values of enthalpy, which is the sum of the PE and KE.

A + B ----> AB + heat

In this reaction (exothermic) PE is being turned to KE and released as heat, therefore, during this reaction, PE is lost and KE is gained.

C + D + heat ----> CD

This reaction is endothermic; heat is being added to the system and is being stored as PE. Therefore, PE is gained. The affect on KE here is not related to the gain in PE.

 

[atlanta213]

The terms endothermic and exothermic stem from the relative values of enthalpy, which is the sum of the PE and KE.

A + B ----> AB + heat

In this reaction (exothermic) PE is being turned to KE and released as heat, therefore, during this reaction, PE is lost and KE is gained.

C + D + heat ----> CD

This reaction is endothermic; heat is being added to the system and is being stored as PE. Therefore, PE is gained.

ya... so it is same as what I said right??? 😀

 

[MattEvers]

ya... so it is same as what I said right??? 😀

Right, but I'm not sure I would say it loses kinetic energy. It's not entirely clear to me how KE changes. But I know for a fact that PE is stored from the heat.

 

[atlanta213]

Got it, so it is matter of PE!!!!!!!!!!!!
I will keep that in mind.