Equilibrium and Le Chatelier

For the reaction...
N_{2 (g)} +  3 H_2 (g) <=> 2 NH_{3 (g)}

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

• N₂  (as 2 mol gas  → 4 mol gas)

• H₂ (as 2 mol gas  → 4 mol gas)

• N₂ and H₂ (as 2 mol gas  → 4 mol gas)

• NH₃ (as 4 mol gas  → 2 mol gas)

For the reaction...
N₂  +  O₂  <=>  2NO:  Δ H = +182 kJ mol^-1.
If the temperature is increased the equilibrium position will shift _______.

• to the left

• to the right

• to the left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

What would happen when H₂O is added?

• Position of equilibrium will shift to left (and become more blue)

• Position of equilibrium will shift to right (and become more pink)

• K_eq will increase as H₂O is added

• Position of equilibrium will shift to left to reduce the added H₂O

Tags

NGSS.HS-PS1-5

What will happen when CI^- ions are added?

• Position of equilibrium will shift to left and become more pink

• Color of system will turn to all pink

• Concentration of reactants and products remain unchanged

• Position of equilibrium will shift to left to reduce the added CI^- ions

Tags

NGSS.HS-PS1-5

2CrO₄^2- + 2H⁺ → Cr₂O₇^2- + H₂O

What will happen when H⁺ ions are added to the system?

• Position of equilibrium will shift to left and become more yellow

• Color of system will turn all yellow

• Color of system will turn all orange

• Equilibrium will shift to right and become more orange

Tags

NGSS.HS-PS1-5

This symbol indicates that a reaction is ____________

• reversible

• irreversible

2SO₂(g)+1O₂(g) ⇌ 2SO₃(g) + Heat

Increasing the volume of the container will...

• shift equilibrium right

• shift equilibrium left

• slow rate of reaction

• have no change

Which is the reactant - and why?

• as concentration decreases

• as concentration decreases

• as concentration increases

• as concentration increases

Tags

NGSS.HS-PS1-5

Consider the following reaction:
2SO_2(g) + O_2(g) <=> 2SO_3(g):  ΔΗ = - 197 kJ mol ^-1
Which of the following will NOT shift the equilibrium position to the right?

• Adding more O₂

• Adding a catalyst

• increasing the pressure

• Lowering the temperature

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 all as 2 mol gas <=> 2 mol gas