Reaction Reversibility Worksheet With Answers Page 2
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4Homework [Answers]: Reaction Reversibility
1. Colorless N
O
gas breaks down into brown NO
gas. Write the chemical equation for
2
4
2
this reaction.
N
O
!
2NO
2
4
2
2. How is the existence of equilibrium indicated in a chemical equation?
In this case, the color is constant (unchanging). When the
conditions of a reaction become stable (pressure, concentration, temp., etc.,..) the reaction
has reached equilibrium.
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
2
4
vessel. Plot the data (include title 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
2
1.8
1.6
[NO
]
1.4
2
1.2
1
0.8
0.6
0.4
0.2
[N
O
]
2
4
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Time, minutes
4.Was all of the N
O
used up in the reaction? How does the graph show this?
2
4
The graph shows that the N
O
amount stabilizes at about 0.2 M. That is where it flattens
2
4
out.
5.According to the graph, how many moles of NO
were produced?
2
The graph (and data) show that the amount of NO
reaches about 1.6 M
2
6. How many moles of NO
would have been produced if all of the N
O
was used up?
2
2
4
If all the NO
were used up, then 2.0 moles of NO
would have been produced. This is
2
2
because the balanced equation shows that 2 NO
is produced for every 1 N
O
used
2
2
4
2
N
O
à
NO
2
4
2
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
2
4
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