C.W.
BAKER HIGH SCHOOL
Le Chatlier’s
Principle
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The
stress for each reaction is indicated.
Answer the questions below.
CaCO3(s) + 2HCl(aq) ßà CaCl2(aq)
+ H2CO3(aq)
1.
HCl is added to the
above system in equilibrium
a)
Which way does the
reaction shift?
b)
What occurs to the
amount of CaCO3?
c)
What occurs to the
concentration of CaCl2?
d)
What occurs to the
concentration of H2CO3?
e)
What happens to the
rate of the forward reaction?
f)
True or False: You can determine which
there is more of, products or reactants, once you understand which way a
reaction has shifted.
O2(g) + N2(g) ßà 2NO(g)
2.
NO is added to the above
system in equilibrium
a)
which way does the
reaction shift?
b)
What occurs to the
concentration of N2?
c)
What occurs to the
concentration of O2?
A + B ßà C + D
3.
D is added to the
above system in equilibrium
a)
Which way does the
reaction shift?
b)
What occurs to the
concentration of A?
c)
What occurs to the
concentration of B?
d)
What occurs to the
concentration of C?
Le Chatlier’s principle
(Pressure &Temperature)
It helps to determine which way a reaction shifts
before answering questions.
CaCO3(aq) + heat
ßà CaO(s) + CO2(g)
4.
Pressure is increased
to the above system in equilibrium
a)
What occurs to the
concentration of CaCO3?
b)
What occurs to the
concentration of CaCl2?
c)
What occurs to the
concentration of H2CO3?
5.
Temperature is now
decreased in the above reaction
a)
What occurs to the
concentration of CaCO3?
b)
What occurs to the
concentration of CaCl2?
e)
What happens to the
rate of the forward reaction?
f)
What happens to the
rate of the reverse reaction?
2A(g) + 2B(g) + 101kJ/mol ßà 4C(g) + D(s)
3. The pressure is increased on the system shown
above
a)
What occurs to the
concentration of A?
b)
Explain
4. The temperature is now
increased.
a)
What occurs to the
rate of the forward reaction?
b)
What occurs to the
rate of the reverse reaction?
c) Why does the equilibrium still shift?
d)
What occurs to the concentration of C?
5. A catalyst is now
added.
a)
How is the reaction’s
equilibrium affected?
b) When a new stress is added how long will it
take to establish the new equilibrium compared to an uncatalyzed reaction?