Chemical Equilibrium

Le Chatelier'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

Changes in pressure will only affect substances that are in the __________ state.

• gaseous
• liquid
• solid
• plasma

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

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

Identify the labels (a) and (b) on the graph.

• a is concentration of reactants and b is the concentration of products
• a is concentration of product and b is the concentration of reactant
• a is the volume of reactants and b is the volume of product
• a is the mass of reactants and b is the mass of product

Tags

NGSS.HS-PS1-5

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.
• The concentrations of reactants and products do not change.
• The concentration of the reactants is equal to the concentration of the products.
• The forward and reverse reactions continue to occur.

Tags

NGSS.HS-PS1-6

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

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,  which substance will increase in concentration?

• N₂
• H₂
• N₂ and H₂
• NH₃

2SO₂(g)+O₂(g)⇌2SO₃(g)
Decreasing volume of container will

• shift equilibrium right
• shift equilibrium left
• change K
• have no change

2SO₂(g)+O₂(g)⇌2SO₃(g)
Using a catalyst

• shift equilibrium right
• shift equilibrium left
• increase rate of reaction
• have no change