## entropy?

$\Delta U=q+w$

cassidysong 1K
Posts: 100
Joined: Fri Aug 30, 2019 12:15 am

### entropy?

why do we need entropy in order to describe the system?

Sydney Myers 4I
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

### Re: entropy?

In order to account for the fact that energy is conserved, we must include entropy because some energy will be lost as entropy. Also, whether or a reaction increases or decreases entropy can have a effect on whether or not it is spontaneous.

Louise Lin 2B
Posts: 97
Joined: Sat Aug 17, 2019 12:15 am

### Re: entropy?

entropy is the measure of disorder in a system. the more disorderly, the more (positive) the entropy and vice versa. disorder in a system also modifies energy, so it is important to include entropy when describing a system.

Andres Merlos 2L
Posts: 46
Joined: Wed Sep 18, 2019 12:17 am

### Re: entropy?

Entropy is a degree of disorder. We need both the change in entropy and the change in internal energy to be able to fully describe how a system will change. We need entropy because its degree would allow us to determine how spontaneous something is.

lauraxie2e
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

### Re: entropy?

Energy is lost due to entropy so we have to factor it in.