Chemical Equilibrium

Question 1

Le Châtelier’s Principle

Answer 1

Chemical system I. Dynamic equilibrium will remain in equilibrium indefinitely until acted upon by an outside influence

Question 2

Concentration

Answer 2

Changing the concentration of a reactant or product that appears in the equilibrium expression temporarily knocks the system out of equilibrium; the system then responds accordingly to move back to equilibrium

Question 3

Increasing [reactant] or decreasing [product]:

Answer 3

Shifts the system to the right

Question 4

Decreasing [reactant] or increasing [product]:

Answer 4

Shifts the system to the left

Question 5

Pressure

Answer 5

Changing the external P on a system at equilibrium by changing the V of the rxn container temp. Knocks the system out of equilibrium only if the balanced rxn has different #s of gas molecules in the reactant and product sides

Question 6

Increasing external P:

Answer 6

Shifts the system toward the side with fewer gas molecules

Question 7

Decreasing external P:

Answer 7

Shifts the system toward the side with more gas molecules

Question 8

Temperature

Answer 8

Changing T always changes the position of equilibrium; does not knock out of equilibrium but moves the actual position of equilibrium because all K’s are T dependent

Question 9

The only way of changing the value of the equilibrium constant

Answer 9

Is to change T

Question 10

Q>K

Answer 10

The system has too much product and must therefore shift to the left to reach equilibrium

Question 11

Q

Answer 11

The system has too much reactant and must shift to the right to reach equilibrium

Question 12

Q=K

Answer 12

In equilibrium and should really be using K instead of Q