Lec 30: Third Law Of Thermo

Question 1

Sponetaity when Delta s universe

> 0
<0
=0

Answer 1

Spont
Non spont
At equilibrium

Question 2

If a pure crystal solid is at zero kelvin what does that mean for entropy

Answer 2

Zero kinetic energy, so only one micro state, meaning no entropy

Complete order

Question 3

Are S standard values zero for elements in most stable forms?

Answer 3

No. This is only for enthalpy and free energy’s

Question 4

What type of functions is free energy

What units

Answer 4

State function, extensive (amount counts)

J or kJ

Question 5

If delta g is negative at constant temp and pressure:

Answer 5

Forward rxn is spont

Question 6

If delta g is positive at constant temp and pressure:

Answer 6

Forward rxn is non spont
Reverse Rxn is spont

Question 7

If delta g is 0 at constant temp and pressure:

Answer 7

Proccess is at equilibrium

Question 8

What is free energy what is it dependent on

Answer 8

Represents the total energy needed to do work

Temperature dependent

Question 9

What is a closed system

Answer 9

Can exchange heat and work with is surroundings but not matter