2.2 Equilibrium and Yield (Part 3 of 4)

Who proposed Le Chatelier's Principle?

• Henry Louis Le Chatelier

• Marie Curie

• Albert Einstein

• Isaac Newton

What does Le Chatelier's Principle state about a system at equilibrium when stress is applied?

• The system immediately reaches a new equilibrium

• The system ignores the stress

• The system's equilibrium is permanently changed

• The system's equilibrium shifts to counteract the stress

What happens to the equilibrium when the concentration of a reactant is increased?

• Shifts to the left

• Becomes unstable

• Shifts to the right

• No change

Does the value of Kc change with a change in concentration?

• Yes, it increases

• Yes, it decreases

• No, it remains the same

• It becomes zero

How does an increase in pressure affect the equilibrium of a gaseous reaction?

• Equilibrium is destroyed

• Shifts in the direction with fewer moles of gas

• No change

• Shifts in the direction with more moles of gas

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

• Decreases the yield

• No effect on the yield

• Increases the yield

• Makes the reaction irreversible

What happens to the value of Kc when the temperature increases for an exothermic reaction?

• Increases

• Becomes negative

• Decreases

• Remains the same

If the number of moles of gas on both sides of a reaction are equal, how does a change in pressure affect the equilibrium?

• No change

• Shifts to the left

• Equilibrium is temporarily lost

• Shifts to the right

What effect does an increase in temperature have on an endothermic reaction at equilibrium?

• Shifts equilibrium to the right

• Decreases the value of Kc

• No effect on equilibrium

• Shifts equilibrium to the left

What is the effect of decreasing the temperature on the equilibrium of an exothermic reaction?

• Shifts to the right

• Shifts to the left

• Increases the value of Kc

• No change in equilibrium