Potential Energy Diagrams Worksheet (With Answers) Page 2
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2Date:
Potential Energy Diagrams
Graph 3: Use the potential energy diagram for the reaction A + B -> C + D to answer the following
questions.
1. Is the reaction exothermic or
60.0
endothermic?
exothermic
50.0
A + B
40.0
2. What is the value of ∆H?
10 - 40 = -30 kcal
30.0
3. What is the value of the activation
20.0
energy of the reaction?
60 - 40 = 20 kcal
C + D
10.0
4. What is the potential energy of the
0.00
products?
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.0
10 kcal
Time (ms)
5. What is the potential energy of the activated complex?
60 kcal
Graph 4: Use the potential energy diagram for the reaction Y + R -> Z + M to answer the following
questions.
1. Is the reaction exothermic or
60.0
Uncatalyzed
endothermic?
reaction
50.0
endothermic
40.0
2. What is the value of the activation
Catalyzed
energy of the uncatalyzed reaction?
reaction
Z + M
30.0
58 - 10 = 48 kcal
20.0
3. What is the value of the activation
energy of the catalyzed reaction?
Y + R
10.0
52 - 10 = 42 kcal
0.00
4. What is the potential energy of the
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.0
activated complex of the catalyzed
Time (ms)
reaction?
52 kcal
5. How does the ∆H for the catalyzed reaction compare to ∆H for the uncatalyzed reaction?
They are exactly the same (20 kcal). The addition of the catalyst does not change the heat of
the reaction (∆H) it only changes the activation energy.
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