Chemical Equilibrium

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal
• Forward and reverse reaction rates are equal and concentration is constant
• Forward and revers reaction rates are equal and concentration is equal
• Forward reaction rate is faster than the reverse and concentration is equal

This symbol indicates that a reaction is ____________

• reversible
• irreversible

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium
• Chemical Balance
• Stoichiometry
• Chemical Reaction

For the reaction...

SO₂ + O₂ ⇌ SO₃

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

• left

• right

• left and right

• neither left nor right

For the reaction...

N_{2 (g)} + 3H_2(g) ⇌ 2NH_{3 (g)}

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

• N₂

• H₂

• N₂ and H₂

• NH₃

2SO_{2 (g)} + O_{2 (g)} ⇌ 2SO_{3 (g)}

Removing O_{2 (g)} will

• shift equilibrium right

• shift equilibrium left

• increase pressure

• have no change

H_{2 (g)} + Cl_2(g) ⇌ 2HCl_(g)

Removing Cl_2(g) will

• shift equilibrium right

• shift equilibrium left

• increase pressure

• have no change

H_{2 (g)} + Cl_2(g) ⇌ 2HCl_(g)

Increasing the pressure will

• shift equilibrium right

• shift equilibrium left

• You cannot predict the effect

• have no change

H_{2 (g)} + Cl_2(g) ⇌ 2HCl_(g)

_

The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?

• equilibrium shifts right

• equilibrium shifts left

• You cannot predict the effect

• no change

For the reaction...
heat  +  N₂  +  O₂  ↔  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

• left
• right
• left and right
• neither left nor right