Chemistry

Name: ________________________ Dyanamic Equilibrium Worksheet

1.

Consider the following equilibrium reaction: Cl2(g) + PCl3(g)  PCl5(g) Initial concentrations of Cl2 and PCl3 are shown in the following data table and the concentration changes at various time periods after the reaction has started. Reaction Time Cl2 (mol/L) 0s 20 s 40 s 60 s 80 s 100 s 120 s

2.

1.00 0.90 0.80 0.75 0.71 0.71 0.71

PCl3 (mol/L)

PCl5 (mol/L)

1.00 0.90 0.80 0.75 0.71 0.71 0.71

0.00 0.10 0.20 0.25 0.29 0.29 0.29

a)

When was equilibrium attained? ________________

b)

What would the concentration of Cl2 be after 20 hours? ________________

c)

After 40 s which reaction (forward or reverse) is faster? ________________

d)

At 25 s is the forward reaction increasing or decreasing in its rate? ________

e)

At 25 s is the reverse reaction increasing or decreasing in its rate? _________

f)

At 100 s which reaction is faster, forward or reverse? ________________

g)

At 100 s which reaction is increasing in rate, the forward or the reverse? ________________

Give an example of a reaction that "goes to an end" from your experience. ______________________________________________________________________

3.

Can all reactions attain a state of equilibrium? Why or why not? ______________________________________________________________________

1

2 4.

a)

Use the following graph to determine:

i)

the equilibrium concentrations of N2(g) ____________, H2(g) ____________, and NH3(g) ____________.

ii)

the time taken to reach equilibrium: _________________

b)

Which reaction (f) or (r) is faster after 10 minutes?

c)

Which reaction (f) or (r) is increasing in rate after (i) 20 min. _________________ and (ii) after 40 min._____________________

4.

When equilibrium is reached through the decomposition of HBr (aq) at high temperatures, how do the amounts of each product compare? ________________________________ Is this true for the decomposition of NH3? Explain. ______________________________________________________________________

2

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