13.3.1 - Second Law and Gibbs free energy Flashcards
1
Q
What does Gibbs energy allow us to work out?
A
Whether or not a reaction is feasible (thermodynamically spontaneous)
2
Q
What is the equation for Gibbs free energy?
A
Enthalpy change - temperature*entropy of system
3
Q
What does it mean if Gibbs free energy is negative?
A
The reaction is feasible
4
Q
What does it mean if Gibbs free energy is positive?
A
The reaction is not feasible
5
Q
What does it mean if Gibbs free energy for a reaction is 0?
A
The reaction is at equilibrium
6
Q
What is the equation for working out which temperature a reaction will be feasible at?
A
Enthalpy change/ entropy of system
7
Q
If a reaction is feasible, why might it not sometimes react at 298K
A
Due to high activation energy
