AP Chemistry - Le Chatelier's Principle

1

$N_{2}(g)+3H_{2}(g) \rightleftharpoons 2NH_{3}(g)$

Figure 1: Ammonia gas formation and equilibrium

Experimental data shows that the reaction shifts to the left at very cold temperatures. Using this information, what type of reaction is shown in Figure 1?

2

$H_{2}O_{(l)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + OH^{-}_{(aq)}$

Self-ionization of water is endothermic. What is the value of the sum pH + pOH at $60^\circ C$ ?

3

According to Le Chatelier's principle, which of the following occurs when you compress a system containing at least one gas species?

4

Which of the following stresses would lead the exothermic reaction below to shift to the right?

$A (g) + B (g) \leftrightharpoons 3C (g) + D (aq)$

5

Consider the following balanced chemical equation:

$H_2(g) + I_2(g) \rightleftharpoons 2HI(g) + \text{Heat}$

What will be the effect on the concentration of if the overall pressure of the system increases, but the volume remains constant? Why?

6

If heat is added to an exothermic reaction, in which direction will the equilibrium shift according to Le Chatelier's principle?

7

Which of the following stresses to a system at equilibrium cause an increase in the production of CH3OH ? CO(g)+ 2H2(g) → CH3OH(g)
(a) H2 is added. (b) The volume is increased. (c) Argon is added. (d) Removing CO.

8

What would happen to the Ksp if NH3 was added to an existing solution of Na2SO4?

9

Which of the following would occur if NH3 was added to an existing solution of Na2SO4?

10

Consider the following reaction:

$H_2(g) + I_2(g) \rightleftharpoons2HI(g) + \text{Heat}$

What will happen to the equilibrium constant if the concentration of is increased? Why?

Le Chatelier's Principle

Practice Questions