## Closed Systems and q

$\Delta U=q+w$

Annalyn Diaz 1J
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

### Closed Systems and q

I understand that in a closed system, energy can be exchanged with its surroundings but matter cannot. If this is the case, why is it that in a closed system, q=0 is always true? Isn't heat a form of energy? Just some clarification for question 4B.9 in the 7th edition of the textbook.

Janice Park 1E
Posts: 36
Joined: Fri Sep 28, 2018 12:22 am

### Re: Closed Systems and q

Hey! I have the sixth edition of the textbook, so I'm not too sure if this is right, but I think you're referring to question 8.15 in the 6th edition!
This question says that an adiabatic process, no energy is transferred at heat, and asks you about an adiabatic process in a closed system.
To answer your question, it isn't because the system is a closed system that q=0 is true, but it is because the process is adiabatic, which means q=0 will always be true, since energy cannot be transferred as heat, there would be no change in heat, so no enthalpy.