KD McMahon
Chemistry
Equilibrium Simulation
1. Adjust the bases so that the left
base is at the 15 mark and the right is
all the way at the bottom.
a. Is the reaction (as adjusted)
exothermic or endothermic.
Explain. _________________
_________________________
_________________________
_________________________
b. What does the “ruler” represent
in the simulation? _________
_________________________
2. Will be performing the following experiments in which you add varying amount of
reactants and or products. Pause the reaction every minute and record the number of
each species present. Continue the reaction until you have completed the data table.
Chart the data on the graph paper provided
a. Exp #1
add 50 A
add 0 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
A
B
a. Exp #2
add 100 A
add 0 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
A
B
A
B
a. Exp #3
add 0 A
add 50 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
a. Exp #4
add 0 A
add 100 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
A
B
A
B
a. Exp #5
add 50 A
add 50 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
Use the graphs to determine the equilibrium concentration (# of specie) of each species
for each of the experiments. Record your data in the table on the following page. Write
the equilibrium expression for the reaction below. Complete the table by calculating the
value of the equilibrium constant for each experiment using the equilibrium
concentrations.
Exp 1
#A
#B
Exp 2
#A
#B
Exp 3
#A
#B
Exp 4
#A
#B
Exp 5
#A
#B
K
K
K
K
K
Questions:
1. What do you notice about K? _____________________________________________
________________________________________________________________________
2. What does this tell us about equilibrium and initial concentration? ________________
________________________________________________________________________
3. What factor(s) do you think might alter the value of K? ________________________
_______________________________________________________________________
Try it and record your data below.
a. Exp #6
add 25 A
add 00 B
Time
(sec)
60
120
180
240
300
360
420
480
540
600
A
B
4. What did you learn from your experiment that you did not know in the previous
experiments? ________________________________________________________
____________________________________________________________________
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