Kinetics & Equilibrium Chemical Reactions Worksheet With Answer Key Page 2
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114. Answer the following questions regarding the kinetics of chemical reactions.
(a) The diagram below shows the energy pathway for the reaction
+ NO NO
O
+ O
. Clearly label the following directly on the diagram.
3
2
2
(i) The activation energy (E
) for the forward reaction
a
(ii)
H) for the reaction
4 NO
(b) The reaction 2 N
O
+ O
is first order with respect to N
O
.
2
5
2
2
2
5
(i) Using the axes below, draw the graph that represents the change in [N
O
] over time
2
5
as the reaction proceeds.
In itial
[ N™O£ ]
Time
(ii) Describe how the graph in (i) could be used to find the reaction rate at a given time, t.
(g) 2 SO
(g) , H is negative for the production of SO
5. For the system 2 SO
(g) + O
.
2
2
3
3
Assume that one has an equilibrium mixture of these substances. Predict the effect of each of
the following changes on (i) the value of the equilibrium constant and (ii) on the number of
moles of SO
present in the mixture at equilibrium. Briefly account for each of your predictions.
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(Assume that in each case all other factors remain constant.)
(a) Decreasing the volume of the system.
(b) Adding oxygen to the equilibrium mixture.
(c)Raising the temperature of the system.
O(g) CO(g) + H
Hº = +131kJ
6.
C(s) + H
(g)
2
2
A rigid container holds a mixture of graphite pellets (C(s)), H
O(g), CO(g), and H
(g) at
2
2
equilibrium. State whether the number of moles of CO(g) in the container will increase,
decrease, or remain the same after each of the following disturbances is applied to the original
mixture. For each case, assume that all other variables remain constant except for the given
disturbance. Explain each answer with a short statement.
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