Chemical Equilibrium and Le Chatelier's Principle Quiz

What happens to a system in dynamic equilibrium when a change is applied?

• The system remains unchanged.

• The system shifts to oppose the change.

• The system speeds up the reaction.

• The system stops reacting.

What is the equilibrium constant (Kc) affected by?

• Changes in concentration

• Change in temperature

• Changes in pressure

• Addition of a catalyst

If Kc is very large (greater than 10^3), what does it indicate?

• High concentration of products

• No reaction occurs

• Equal concentration of reactants and products

• High concentration of reactants

What effect does an increase in pressure have on a gaseous equilibrium?

• Favors the side with more gaseous molecules

• Favors the side with fewer gaseous molecules

• Stops the reaction

• Has no effect

In the Haber Process, what is the role of the iron catalyst?

• Increases the yield of ammonia

• Shifts equilibrium to the right

• Speeds up the reaction

• Decreases the pressure needed

What happens to the equilibrium position if ammonia is removed from the Haber Process?

• Stops the reaction

• Remains unchanged

• Shifts to the right

• Shifts to the left

What is the effect of a decrease in temperature on an exothermic reaction?

• Favors the forward reaction

• Stops the reaction

• Favors the backward reaction

• Has no effect

What does a Kc value of less than 10^-3 indicate?

• High concentration of products

• High concentration of reactants

• Equal concentration of reactants and products

• No reaction occurs

In the equation aA + bB ⇌ cC + dD, what happens if [A] is increased?

• Equilibrium shifts to the left

• Reaction stops

• Equilibrium shifts to the right

• Equilibrium remains unchanged

What is the effect of a catalyst on the position of equilibrium?

• Stops the reaction

• Shifts equilibrium to the right

• Has no effect on equilibrium position

• Shifts equilibrium to the left