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WorksheetsEquilibrium & Le Chatelier's Principle Review
Total questions: 19
Worksheet time: 2hrs 37mins
Name
Class
Date
1.
At what time (in seconds) is equilibrium established?
a)
0 seconds
b)
1 second
c)
5 seconds
d)
10 seconds
2.
Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,
a)
the system will adjust to increase the stress
b)
the system will adjust to reduce the stress
c)
the system will not adjust
3.
When writing an endothermic reaction, heat energy is stated as
a)
product
b)
catalyst
c)
reactant
4.
An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift
a)
toward the middle
b)
toward the reactant side
c)
toward the product side
5.
For the reaction...
SO2(g) + O2(g) <−> SO3(g)
If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.
SO2(g) + O2(g) <−> SO3(g)
If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.
a)
shift to the left
b)
shift to the right
c)
not shift
6.
For the reaction...
SO2(g) + O2(g) <−> SO3(g)
If the equilibrium shifts to the right, the concentration of O2(g) will ___________.
SO2(g) + O2(g) <−> SO3(g)
If the equilibrium shifts to the right, the concentration of O2(g) will ___________.
a)
increase
b)
decrease
c)
remain the same
7.
For the reaction...
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.
a)
shift to the left
b)
shift to the right
c)
not shift
8.
For the reaction...
N2 (g) + 3 H2 (g) <−> 2 NH3 (g)
If the pressure in the system is increased, the reaction will __________________.
N2 (g) + 3 H2 (g) <−> 2 NH3 (g)
If the pressure in the system is increased, the reaction will __________________.
a)
shift to the left
b)
shift to the right
c)
not shift
9.
When ΔH is negative it represents a(n)
a)
exothermic reaction
b)
endothermic reaction
10.
The three factors that affect the equilibrium of a reaction are temperature, pressure and __________.
a)
energy
b)
concentration
c)
enthalpy
d)
ice
11.
A(g) + B(aq) <> C(s)
ΔHrxn= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______.
ΔHrxn= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______.
a)
Left
b)
Right
c)
Stays the same
d)
Up
12.
A(g) + B(aq) <> C(s) + D(s)
ΔHrxn= 240 kJ/mol
If the pressure decreases then the reaction will shift to the _____.
ΔHrxn= 240 kJ/mol
If the pressure decreases then the reaction will shift to the _____.
a)
left
b)
right
c)
stays the same
d)
Up
13.
At what time does the reaction reach equilibrium?
a)
t1
b)
t2
c)
t3
d)
t4
14.
2SO2(g)+O2(g)⇌2SO3(g)
Removing O2(g) will
Removing O2(g) will
a)
shift equilibrium right
b)
shift equilibrium left
c)
decrease temperature
d)
have no change
15.
2SO2(g)+O2(g)⇌2SO3(g) is an exothermic reaction.
an in Increase temperature will...
an in Increase temperature will...
a)
shift equilibrium toward the right
b)
shift equilibrium toward the left
c)
increase pressure
d)
have no change
16.
Which is NOT a way to stress a closed chemical system at equilibrium?
a)
change temperature
b)
add a reactant
c)
take away a chemical in the reaction
d)
add a catalyst
17.
A single sided arrow (→), indicates that a reaction is:
a)
Reversible
b)
Irreversible
c)
Not reactive
18.
A double sided arrow (↔), indicates that a reaction is:
a)
Reversible
b)
Irreversible
c)
Not reactive
19.
When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:
a)
Chemical equilibrium
b)
Chemical reaction
c)
Chemical constant
d)
Chemical peace
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