Unit 9: Day 4 Le Chatelier's principle

Multiple Choice

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Multiple Choice

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Multiple Choice

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
• Chemical Constant
• Chemical Reaction

Multiple Choice

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.

Math Response

What is the ΔH (in kJ) of the reaction shown in the diagram?

Type answer here

Correct Answer: -71

Deg^°

Rad

Multiple Choice

If the concentration of NH4NO3_(s)  is increased, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift Right

• Shift Left

Multiple Choice

If the concentration of NH4NO3_(s)  is decreased, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift Right

• Shift Left

Multiple Choice

If the concentration of HCl_(g)  is decreased, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift left

• Shift Right

​Temperature

Multiple Choice

If the heat is added, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift Left

• Shift Right

Multiple Choice

If the heat is added, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift Left

• Shift Right

Multiple Choice

If the heat is removed, the equilibrium of the reaction will ___________.

• Stay consistant

• Shift Left

• Shift Right

Multiple Choice

If the pressure is increased, the equilibrium of the reaction will ___________.

• stay consistant

• shift left

• shift right

Multiple Choice

If the pressure is decreased, the equilibrium of the reaction will ___________.

• stay consistant

• shift left

• shift right

Multiple Choice

What phase of matter has the most entropy?

• solid

• liquid

• gas

Multiple Choice

Which of these reactions shows a DECREASE in entropy?

• CaCO₃(s) → CaO(s) + CO₂(g)

• 3O₂(g) → 2O₃(g)

• 2NH₃(g) → 3H₂(g) + N₂(g)

• C₆H₆(l) → C₆H₆(g)