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Chemistry Equilibrium

Total questions: 22

Worksheet time: 13mins

Name
Class
Date
1.
Changes in pressure will only affect substances that are in the __________ state.
a)
gaseous
b)
liquid
c)
solid
d)
plasma
2.
What are the two factors to look for when determining if the reaction is at equilibrium?
a)
Forward reaction rate is faster than the reverse and concentrations are equal
b)
Forward and reverse reaction rates are equal and concentration is constant
c)
Forward and revers reaction rates are equal and concentration is equal
d)
Forward reaction rate is faster than the reverse and concentration is equal
3.
When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in
a)
Chemical Equilibrium
b)
Chemical Balance
c)
Stoichiometry
d)
Chemical Reaction
4.

For the reaction...

N2 (g) + 3 H2(g) ⇌ 2 NH3 (g)


If the pressure in the system is increased, which substance(s) will increase in concentration?

a)

N2

b)

H2

c)

N2 and H2

d)

NH3

5.

What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O2 (g) ⇌2NO2(g)?

a)

The yield of NO2 increases

b)

The yield of NO2 decreases

c)

The reaction is slower

d)

The concentration of O2 increases.

6.
Which of the following is NOT true at equilibrium?
a)
The forward and reverse reactions proceed at the same rate.
b)
The concentrations of reactants and products do not change.
c)
The concentration of the reactants is equal to the concentration of the products.
d)
The forward and reverse reactions continue to occur.
7.

H2(g)+Cl2(g)⇌2HCl(g)

Removing Cl2(g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase pressure

d)

have no change

8.

H2(g)+Cl2(g)⇌2HCl(g)

Increasing the pressure will

a)

shift equilibrium right

b)

shift equilibrium left

c)

You cannot predict the effect

d)

have no change

9.

A complete reaction is in which:

a)

All the reactants convert into products

b)

All the reactants do not convert into products

c)

Half reactants convert into products

d)

only 10% reactants convert into products

10.
2SO2(g)+O2(g)⇌2SO3(g)
Adding SO2(g) will
a)
shift equilibrium right
b)
shift equilibrium left
c)
increase rate of reaction
d)
have no change
11.
2A + 3B  <---->  2AB
The forward reaction points towards the __________.
a)
left
b)
right
c)
up
d)
down
12.

What is the effect of catalyst on a reversible reaction?

a)

Catalyst increases the product of a reaction

b)

Catlyst increases the equilibrium constant

c)

Catalyst increases the rate of the forward reaction

d)

Catalyst increases both the rate of forward and reverse reaction

13.
For the reaction...
SO2 + O2  <−>  SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.
a)
left
b)
right
c)
left and right 
d)
neither left nor right
14.
For the reaction...
heat  +  N2  +  O2  <−>  2NO
If  O2 is removed, the  concentration of N2 will _______.
a)
increase
b)
decrease
c)
remain the same
d)
double
15.
For the reaction...
H2 (g)  + Cl2 (g) <−>  2HCl (g)  +  heat
If the temperature is cooled, the _________ reaction will be favored.
a)
forward
b)
reverse
c)
forward and reverse
16.
For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is increased,  _______ reaction will be favored.
a)
 the forward
b)
the reverse
c)
neither
17.
For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is decreased,  which substance will increase in concentration?
a)
N2
b)
H2
c)
N2 and H2
d)
NH3
18.
Why is equilibrium called a dynamic state?
a)
Chemists try to convert as much reactants as possible into products.
b)
The reactions at equilibrium continue to take place once equilibrium is established.
c)
The products of a forward reaction are favored, so equilibrium lies to the right.
d)
All chemical reactions are considered to be reversible under suitable conditions.
19.
It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.
a)
reversible reaction
b)
irreversible reaction
c)
decomposition reaction
d)
synthesis
20.
The picture shows a reversible chemical reaction taking place. How can equilibrium be reached?
a)
Stopper the flask.
b)
Add more reactants.
c)
Add more products.
d)
Cool the contents.
21.

The factors that effect a system at equilibrium except:

a)

Caltalyst

b)

Temperature

c)

Pressure and volume

d)

Concentration

22.

MnO2 is used as a catalyst in the decomposition of hydrogen peroxide into hydrogen gas and oxygen gas. Increasing the concentration of MnO2 would cause the equilibrium to

a)

shift to the left

b)

shift to the right

c)

there would be no effect

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