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Chemical Equilibrium

Total questions: 19

Worksheet time: 19mins

Name
Class
Date
1.
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
2.
For the reaction...
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
3.
For the reaction...
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
4.
For the reaction...
energy +  N2(g)  +  O2(g)  <−>  2NO(g)
If  O2(g) is removed, the  concentration of N2 will _______.
a)
increase
b)
decrease
c)
remain the same
d)
double
5.
A +  B <--> C + D   ΔH= 151kJ
Rewrite the above equation with energy as a reactant or product:
a)
A +  B <--> C + D + energy
b)
A +  B + energy <--> C + D 
6.
For the reaction...
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
7.
For the reaction...
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
8.
When  ΔH  is negative it represents a(n)
a)
exothermic reaction 
b)
endothermic reaction 
9.
The three factors that affect the equilibrium of a reaction are temperature, pressure and __________. 
a)
energy
b)
concentration 
c)
enthalpy 
d)
ice 
10.
  A(g) + B(aq) <> C(s) 
 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
11.
What would happen to the position of the equilibrium when Oxygen is added to the system?
 2SO3(g) 2SO2(g) + O2(g) 
a)
SOwill increase 
b)
SO3 will decrease 
c)
SO2 will increase
d)
none of the above
12.

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

13.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g)

Predict the direction that the reaction will proceed, or shift, if...

N2 is added

a)

right

b)

left

c)

no effect

14.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol

Predict the direction that the reaction will proceed, or shift, if...

H2 is removed

a)

right

b)

left

c)

no effect

15.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol

Predict the direction that the reaction will proceed, or shift, if...

NH3 is added

a)

right

b)

left

c)

no effect

16.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol

Predict the direction that the reaction will proceed, or shift, if...

NH3 is removed

a)

right

b)

left

c)

no effect

17.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol

Predict the direction that the reaction will proceed, or shift, if...

The reaction is cooled.

a)

right

b)

left

c)

no effect

18.

For the following equilibrium reaction:

N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol

Predict the direction that the reaction will proceed, or shift, if...

The reaction is heated.

a)

right

b)

left

c)

no effect

19.

How does the addition of a catalyst shift the direction of an equilibrium reaction?

a)

toward more products

b)

toward more reactants

c)

no shift in either direction