2023 ~ K and E review ~ Mr. Kuster

What is LeChatelier's Principle?

• Stresses do not shift a reaction
• Equilibrium does not exist
• A stress only shifts a reaction to the right
• A reaction at equilibrium will adjust to relieve a stress

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

At what time (in seconds) is equilibrium established?

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

2A + 3B  <---->  2AB
The forward reaction points towards the __________.

• left
• right
• up
• down

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

What conditions that must be met in order for a chemical reaction to take place?

• Collisions with the proper orientation
• Sufficient activation energy
• Appropriate coefficient of friction
• Both collisions with the proper orientation and sufficient energy

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

Such reactions which continue in both directions are called:

• Irreversible reactions

• Reversible reactions

• Non-reactive reactions

• dynamic reactions