Dynamic Equilibrium and Le Chatelier's Priniciple

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

Tags

NGSS.HS-PS1-6

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

• toward the middle
• toward the reactant side
• toward the product side

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

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-PS1-6

NGSS.HS-PS1-5

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-PS1-6

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 

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

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

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-4

  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-PS1-6

NGSS.HS-PS1-5

Which of the following will increase the amount of O2?For the reaction below;
2 SO3 (g)  +  Heat ⇋ 2 SO2 (g)  +  O2 (g)

• Adding SO3
• Adding heat
• Removing SO2
• All the above 

Consider the following reaction: 
Heat  + 2NaClO_3(s) ⇌ 2NaCl_(s) + 3O_2(g)    Which of the following will cause a shift to the right?

• adding more O₂
• adding more NaCl
• removing some NaClO₃
• increasing the temperature