## Test 2 Gibbs Free Energy

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Stevin1H
Posts: 89
Joined: Fri Sep 28, 2018 12:17 am

### Test 2 Gibbs Free Energy

How were we supposed to determine that the Gibbs free energy was negative on test 2 for the examples regarding the melting snow and activating a heat pack?

Rachel-Weisz3C
Posts: 66
Joined: Fri Sep 28, 2018 12:23 am

### Re: Test 2 Gibbs Free Energy

Ice melting is a spontaneous reaction and when you have a spontaneous reaction, $\Delta$G is automatically negative. If it was a non-spontaneous reaction $\Delta$G would be positive.

Calvin Patel 2H
Posts: 37
Joined: Fri Sep 28, 2018 12:22 am

### Re: Test 2 Gibbs Free Energy

Melting ice is a spontaneous reaction, and a negative Gibbs Free Energy indicates a spontaneous reaction.

Sapna Ramappa 1J
Posts: 63
Joined: Fri Sep 28, 2018 12:24 am

### Re: Test 2 Gibbs Free Energy

Ice melting will occur spontaneously without any input of energy, so you can assume the reaction is exergonic/spontaneous, and thus delta G will be negative.

Chris Freking 2G
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

### Re: Test 2 Gibbs Free Energy

Why would the cold/heat pack activation be considered spontaneous?

Soumya Ravichandran 4H
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

### Re: Test 2 Gibbs Free Energy

The cold/heat pack is considered to be spontaneous because the question said that heat is being released. Since the reaction is exothermic, it is thermodynamically favorable, thus making the reaction spontaneous.