Le Chatelier's Principle

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

At what time (in seconds) is equilibrium established?

• 0 seconds
• 1 second
• 5 seconds
• 10 seconds

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the concentration of SO_2(g)  is increased, the equilibrium of the reaction will ___________.

• shift to the left
• shift to the right
• not shift

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the equilibrium shifts to the right, the concentration of O_2(g) will ___________.

• increase
• decrease
• remain the same

Tags

NGSS.HS-PS1-6

For the reaction...
energy +  N_2(g)  +  O_2(g)  <−>  2NO_(g)
If  O_2(g) is removed, the  concentration of N₂ will _______.

• increase
• decrease
• remain the same
• double

Tags

NGSS.HS-PS1-5

A +  B <--> C + D   ΔH= 151kJ
Rewrite the above equation with energy as a reactant or product:

• A +  B <--> C + D + energy
• A +  B + energy <--> C + D 

For the reaction...
heat  +  N_2(g)  +  O_2(g)  <−>  2NO_(g)
If the heat is removed to the chemical system, the equilibrium will _______.

• shift to the left
• shift to the right
• not shift

When  ΔH  is negative it represents a(n)

• exothermic reaction 
• endothermic reaction 

The three factors that affect the equilibrium of a reaction are temperature, pressure and __________. 

• energy
• concentration 
• enthalpy 
• ice 

Tags

NGSS.HS-PS1-6

What would happen to the position of the equilibrium when Oxygen is added to the system?
 2SO₃(g) ⇋ 2SO₂(g) + O₂(g) 

• SO_{3 will increase} 
• SO_{3 will decrease} 
• SO2 will increase
• none of the above