Introduction to Equilibrium

Given the K_c for a forward reaction, how can you find K_c for the reverse reaction?

• Divide K_c by 1

• Divide 1 by K_c

• Square K_c

• Take the square root of K_c

This endothermic reaction is at equilibrium.
If its temperature is increased (at constant volume and pressure), which way will the equilibrium shift?

• To products (right)
• To reactants (left)

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium
• Chemical Balance
• Stoichiometry
• Chemical Reaction

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

NGSS.HS-PS1-6

For the reaction...

heat + N₂ + O₂ ↔ 2NO

If heat is added to the chemical system, the equilibrium will shift _______.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-4

2SO₂(g)+O₂(g)⇌2SO₃(g)

Decreasing the 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

At what time (in seconds) is equilibrium established?

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