Equilibrium Practice Test

The idea that when a system at equilibrium is stressed, it will react to relieve that stress and return to equilibrium is known as:

• Boyle's Law
• Le Chatelier's Principle
• Charles Law
• Denninger's Law

For the reaction...

SO₂ + O₂ ⇌ SO₃

If the concentration of SO₂ is increased, the equilibrium of the reaction will shift ___________.

• to the left

• to the right

• no shift will occur

• not enough information

For the reaction...
SO2 + O2 ⇌ SO3
If the concentration of O2 is decreased, the equilibrium of the reaction will shift ___________.

• to the left

• to the right

• no shift will occur

• not enough information

For the reaction...

N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)}

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

• N₂

• H₂

• N₂ and H₂

• NH₃

For the reaction...

heat + N₂ + O₂ ⇌ 2NO

If the heat is added to the chemical system, the equilibrium will shift _______.

• to the left

• to the right

• no shift will occur

• not enough information

What states of matter are included when calculating K_eq?

• Solids and Liquids
• Aqueous and Gas
• Solids, Liquids, Aqueous solutions and Gases
• Aqueous Solutions & Liquids

A mixture of 0.500 mol H₂ and 0.500 mol I₂ was placed in a 1.00L flask.  The equilibrium constant K_eq for the reaction H_2(g) + I_2(g) ↔ 2HI_(g) is 54.3.  What is the concentration of HI at equilibrium?

• 0.5M
• 1.0M
• 0.786M
• 3.7M

When K_eq > 1, 

• There are more products than reactants when the reaction reached equilibrium.
• There are more reactant than products when the reaction reached equilibrium.
• The amount of reactants is equal to the amount of products.

For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)  $\Delta H\degree\ =\ 92kJ$  ;
what happens to the equilibrium position by adding a catalyst to this reaction?

• Shifts to the left 

• Shifts to the right 

• No shift will occur

• Not enough information

For the reaction...

H_{2 (g)} + Cl_{2 (g)} <=> 2HCl _(g) + heat

If the pressure in the system is increased, the equilibrium position will _______.

• shift to the left

• shift to the right

• not shift position at