Thermodynamics Test Review
1. Define endothermic.
2. What is
∆
H for an endothermic reaction?
3. Define exothermic.
4. What is
∆
H for an exothermic reaction?
5. Be able to calculate heat or specific heat using q=mc
∆
T
a. How
much heat is released when 25 mL of water is heated 5
°
C. The specific heat of water is 4.184
J/g
°
C?
b. The temperature change of a 1.5

g sample of metal was 2.5
°
when that metal absorbed 675 kJ of
heat. Calculate the specific heat of the metal.
6. Understand entropy. When is
∆
S positive and when is
∆
S negative?
Determine
∆
S for the following phase changes.
a. (l)
(g)
b. (g)
(s)
c. (s)
(aq)
d. (l)
(aq)
e. (l)
(s)
7.
Understand a potential energy diagram
and recognize if it is exothermic or endothermic.
8. Be
able to read and interpret a phase change diagram. Locate the freezing point, melting point,
boiling point, condensation point. Be able to determine when the substance is a solid, liquid, or a gas.
9. What is the symbol for free energy?
10.
What is
∆
G for a nonspontaneous (needs energy) reaction?
11. What is
∆
G for a spontaneous (releases energy) reaction?
12. Calculate
∆
G using the equation
∆
G=
∆
H

T
∆
S and the following data.
∆
H =

68.5 kJ/mol
∆
S = 95.2 J/mol K
T = 298 K
13. Be
able to calculate
∆
H using the information below:
∆
H kJ/浯l
Na(s)
0.0
H
2
O(l)

286
NaOH(aq)

470
H
2
(g)
0.0
Calculate
∆
H for the following reaction:
2Na(s) + 2H
2
O(l)
2NaOH(aq) + H
2
(g)
14. The ΔH of N
2
O
5
(g) is to be determined using the
thermodynamic data shown below.
2H
2
(g) + O
2
(g)
2H
2
O(l)
ΔH =

285.8 kJ/mol
2N
2
O
5
(g) + 2H
2
O(l)
4HNO
3
(l)
ΔH =

153.2 kJ/mol
N
2
(g) + 3O
2
(g) + H
2
(g)
2HNO
3
(l)
ΔH =

174.1 kJ/mol
Using the thermodynamic data above, determine the ΔH of for the
following reaction:
2N
2
+ 5O
2
2N
2
O
5
15.
Be able to solve:
A metal with a
mass of 12.2 grams and an initial temperature of 100.5
°
C is added to 25.0 grams of water
with an initial temperature of 23.5
°
C. After the metal was added, the temperature
of the water rose to
29.0
°
C. Calculate the specific heat of the metal. The specific heat of water is 4.184 J/g
°
C.
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