Le Chatelier Principle

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

Which is NOT a way to stress a closed chemical system at equilibrium?

• change temperature

• add a reactant

• take away a chemical in the reaction

• add a catalyst

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

If I add a chemical to a system at equilibrium, increasing its concentration,

• the reaction will shift to the same side of the equation where it appears to make more of it

• the reaction will shift to the opposite side of the equation where it appears to use some of it up

• the reaction will not shift

• byproducts (other unwanted chemicals) will be formed to use the excess

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What does it mean to "shift" an equilibrium?

• increase the rate of either the forward or reverse reaction

• increase the rate of both the forward and reverse reactions

• make new chemicals

• adjust concentrations to reach a new equilibrium ratio

Tags

NGSS.HS-PS1-6

Increasing the pressure on an equilibrium system will

• shift the reaction to the side with more moles of chemicals

• shift the reaction to the side with more moles of gas

• shift the reaction to the side with fewer moles of gas

• shift the reaction to the side with fewer moles of chemicals

Increasing the temperature of a closed equilibrium system

• will shift the reaction in the endothermic direction

• will shift the reaction in the exothermic direction

• will not shift the reaction

• will shift the reaction to the side with heat

Tags

NGSS.HS-PS1-4

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

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

If the pressure in the system is increased, the reaction will __________________.

•  shift to the left

• shift to the right

• not shift

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

• energy

• concentration 

• enthalpy 

• ice 

Tags

NGSS.HS-PS1-6

A_(g) + B_(aq) <> C_(s) 
 ΔH_rxn= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______. 

• Left

• Right

• Stays the same 

• Up

Tags

NGSS.HS-PS1-5