Le Chatelier's Principle

Question 1

When the forward and reverse reaction occur at the same rate, the reaction is said to be in…

Answer 1

Equilibrium

Question 2

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

Answer 2

Favors the forward reaction
(Shifts towards products)

Question 3

What happens to the equilibrium of a reactant’s concentration is decreased?

Answer 3

Favors the reverse reaction
(Shifts towards reactants)

Question 4

What happens to the equilibrium of an exothermic reaction of heat is added? Why?

Answer 4

The reverse reaction is favored because heat is a product.
(Reactions shifts towards reactants)

Question 5

What happens to the equilibrium of an endothermic reaction if heat is added?

Answer 5

The forward reaction is favored because heat is a reactant.
(Reaction shifts towards products)

Question 6

For the rxn A + B <−> C + D, what happens if C or D are reduced?

Answer 6

Forward rxn is favored
(Shifts towards products)

Question 7

For the rxn: 2A (g) + 3B (g) <−> C (g) + 3D, what happens if pressure is reduced?

Answer 7

The reverse rxn is favored because the equilibrium shifts toward the larger moles of gas which are on the left side.

Question 8

How does the equilibrium change if a catalyst is added?

Answer 8

No change in equilibrium (catalysts only change rate at which equilibrium is reached)

Question 9

When you take something away from a system at equilibrium the system shifts in such a way as to _________ some of what you’ve taken away

Answer 9

Replace

Question 10

Le Chatelier’s principle states that

Answer 10

if a system at equilibrium is disturbed, the equilibrium position will shift to counter the effects of the disturbance