1.
What is the symbol for entropy?________________________________________________
2.
What values for entropy will show randomness or disorder?__________________________
3.
What values for entropy will show order? _________________________________________
4.
Predict whether the following will have a positive entropy or a negative entropy a.
CaCO
3
(s)  CaO(s) + CO
2
(l) b.
2H
2
(g) + O
2
(g)  2H
2
O c.
Fe(s)  Fe(l) d.
4Al(s) + 3O
2
(g)  2Al
2
O
3
(s)
5.
Which usually has the greatest entropy? Solid, liquid, gas
6.
The combined enthalpy-entropy function is called _________________ and is represented by
_________.
7.
Give the formula for the enthalpy-entropy change.
8.
A spontaneous reaction always has a ______ΔG.
9.
A positive ΔS value will represent ordering or disordering?
10.
Given the following reaction at 25 o C and ∆S= 0.003 kJ/K*mo, find the ∆G and determine if the reaction is spontaneous or nonspontaneous.
C(s, graphite) + O
2
(g)  CO
2
+ 393.5 kJ/mol
11.
Calculate the Gibb’s Free Energy change for the following reaction at 25 o C.
Ca(s) + 2H
2
O(l)  Ca(OH)
2
(s) + H
2
(g)
Given: ΔH o = -411.6 KJ/mole ΔS o = .0318 KJ/(moleK)
12.
Calculate the Gibbs free energy for the following reaction at 25 o C . ∆S= 3235.7 J/K*mol
5CO
2
(g) + Si
3
N
4
(s)  3SiO (g) + 2N
2
O + 5CO (g)
Use the following equations and data
CO (g) + SiO
2
(s)  SiO(g) + CO
2
(g) ΔH= +520.9 KJ
8 CO
2
(g) + Si
3
N
4
(s)  3SiO
2
(s) + 2N
2
O(g) + 8CO(g) ΔH= +461.05 KJ