Reaction Reversibility Worksheet With Answers
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2
3
4Name
Period
Date
Pre-AP Chemistry
Homework: Reaction Reversibility
1. Colorless N
O
gas breaks down into brown NO
gas. Write the chemical equation for this reaction.
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4
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2. How is the existence of equilibrium indicated in a chemical equation?
3. Because the two gasses in this equilibrium are different colors, their concentrations can be
determined using a spectrophotometer. The following chart indicates what happens over
time following the addition of 1 mol N
O
to an empty 1 L vessel. Plot the data (include title
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4
and label axes).
Time (min)
0
1
2
3
4
5
6
7
8
9
10
11
12
[N
O
]
1.00
0.70
0.45
0.35
0.30
0.27
0.25
0.23
0.22
0.21
0.20
0.20
0.20
2
4
[NO
]
0
0.60
1.10
1.30
1.40
1.46
1.50
1.54
1.56
1.58
1.60
1.60
1.60
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4.Was all of the N
O
used up in the reaction? How does the graph show this?
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4
5. According to the graph, how many moles of NO
were produced?
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6. How many moles of NO
would have been produced if all of the N
O
was used up?
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4
7. Use the collision theory to explain why all of the N
O
is not used up and why equilibrium is eventually established (think about
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4
forward versus reverse reactions, and how concentration affects reaction rate).
8. Assume the spectrophotometer cannot directly measure [N
O
], but can measure [NO
] because of its brown color. Explain how
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4
2
the [N
O
] values would be calculated.
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4
9. Define reaction reversibility.
10. Can the same equilibrium be reached starting with pure NO
? If so, how much NO
would be required?
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2
11. HI can form via the equation: H
(g) + I
(g)
→
2HI(g). 1 mol H
and 1 mol I
were placed in a 1 L vessel (no HI was present
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2
2
2
initially). At equilibrium [HI] was measured to be 1.56 mol/L. Sketch a graph for the equilibrium reaction, clearly indicating the
starting and equilibrium concentrations of all chemicals. (Be careful to draw the general shape of the lines correctly: straight vs.
curving up vs. curving down).
12. Ammonia is produced via the reaction: N
(g) + 3H
g)
→
2NH
(g). 1 mol N
and 3 mol H
were placed in an empty 2 L
2
2(
3
2
2
container. The equilibrium [ ] of N
was 0.3 mol/L. Sketch a graph for this reaction.
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