Free Printable Chemical Equilibrium

1.

The reaction 2ICl(s) ⇌ $I_2$ (s) + $Cl_2$ (g) is at equilibrium. Which change will increase the yield of $Cl_2$

a)

removing some of the $I_2$ (s)

b)

adding more ICl(s)

c)

removing the $Cl_2$ as it is formed

d)

decreasing the volume of the container

2.

Consider the equilibrium: 2 $NO_2$ (g) ⇌ $N_2O_4$ (g) + energy. The equilibrium will shift to the left as a result of

a)

adding a catalyst

b)

increasing the volume

c)

removing some $N_2O_4$

d)

decreasing the temperature

3.

An indication that an equilibrium system favours the products is a …

a)

large $K_c$

b)

positive ΔH

c)

very small value for $K_c$

d)

low activation energy

4.

The reaction CO(g) + 2 $H_2$ (g) ⇌ $CH_3OH$ (g) + energy produces methanol. What will maximize the equilibrium yield of $CH_3OH$ ?

a)

low temperature and low pressure

b)

high temperature and low pressure

c)

low temperature and high pressure

d)

high temperature and high pressure

5.

Consider the equilibrium: $PCl_5$ (g) ⇌ $PCl_3$ (g) + $Cl_2$ (g). A 1 L flask contains 0,02 mol $PCl_5$ , 0,05 mol $PCl_3$ and 0,05 mol $Cl_2$ at equilibrium. The value of $K_c$ is …

a)

0,125

b)

2,50

c)

5,00

d)

8,00

6.

Consider the equilibrium:

$CH_3COOH$ (aq) + $H_2O$ (l) ⇌ $CH_3COO^-$ (aq) + $H_3O^+$ (aq) + heat

A stress was applied at time t1 and the data was plotted …

The stress is the result of …

a)

the addition of HCl

b)

decreasing the temperature

c)

the addition of $NaCH_3OO$

d)

increasing the volume of the container

7.

Consider the equilibrium: C(s) + 2 $H_2$ (g) ⇌ $CH_4$ (g). The addition of $H_2$ will cause the equilibrium to shift to the …

a)

left and $\left[CH_4\right]$ will increase

b)

left and $\left[CH_4\right]$ will decrease

c)

right and $\left[CH_4\right]$ will increase

d)

right and $\left[CH_4\right]$ will decrease

8.

Of the following equilibria, only __ will shift to the left in response to a decrease in volume …

a)

4Fe(s) + 3 $O_2$ (g) ⇌ 2 $Fe_2O_3$ (s)

b)

$H_2$ (g) + $Cl_2$ (g) ⇌ 2HCl(g)

c)

2 $SO_3$ (g) ⇌ 2 $SO_2$ (g) + $O_2$ (g)

d)

2HI(g) ⇌ $H_2$ (g) + $I_2$ (g)

9.

The reaction is exothermic: 2 $SO_2$ (g) + $O_2$ (g) ⇌ 2 $SO_3$ (g). Le Chatelier predicts that ____ will result in an increase in the number of moles of $SO_3$ (g) in the reaction container.

a)

increasing the pressure

b)

increasing the temperature

c)

removing some oxygen

d)

increasing the volume of the container

10.

At equilibrium: 2 $NH_3$ (g) ⇌ $N_2$ (g) + 3 $H_2$ (g). Le Chatelier pre-dicts that the moles of $H_2$ will increase with ….

a)

removal of $NH_3$ from the reaction vessel

b)

a decrease in the total pressure

c)

addition of $N_2$ to the reaction vessel

d)

a decrease in the total volume of the reaction vessel

Chemical Equilibrium

Total questions: 10

Worksheet time: 15mins

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