Gibbs Free Energy

Question 1

What makes a reaction feasible

Answer 1

G<0
^G°= ^H° - T^s°

Question 2

Entropy

Answer 2

A measure of disorder
Solid<liquid<gas
The higher the Mr in same state the higher the entropy

Question 3

Feasibility vs spontaneity

Answer 3

Feasible reactions may not occur at certain temperature
Spontaneous reactions are feasible under standard conditions
Feasibility effectd by temperature

Question 4

Physical changes with gibbs

Answer 4

Changing state ^G=0, and system is at equillibrium
G>0 for temperatures below melting points as it is not feasible
G<0 for temperatures above melting points as it is feasible

Question 5

Gibbs graph key features

Answer 5

Y intercept: H
Gradient: -S
G plotted against T