Chemistry 1.24: 6.4.3 Disturbing Equilibrium Lab

Multiple Choice

Intro Question:

According to Le Chatelier's Principle, what happens to a reaction at equilibrium if you increase the amount of products?

• There will be no change in the equilibrium position.

• The equilibrium will shift to the product side.

• The equilibrium will shift to the reactant side.

Multiple Choice

What is the Equilibrium Constant Expression for the following reaction:

$$N_2\left(g\right)\ +\ O_2\left(g\right)\ \leftrightarrow\ 2NO\left(g\right)$$  

• $$K_{eq}\ =\ \frac{\left[N_2\right]\left[O_2\right]}{\left[NO\right]^2}$$  

• $$K_{eq}\ =\ \frac{\left[NO\right]^2}{\left[N_2\right]\left[O_2\right]}$$  

• $$K_{eq}\ =\ \left[N_2\right]\left[O_2\right]\left[NO\right]^2$$  

Multiple Choice

Given the following reaction: $$N_2\left(g\right)\ +\ O_2\left(g\right)\ +\ Heat\ \leftrightarrow\ 2NO\left(g\right)$$  

Predict the direction the equilibrium will shift if the amount of oxygen gas is increased.

• To the product side

• To the reactant side

• There will be no shift

Multiple Choice

Given the following reaction: $$N_2\left(g\right)\ +\ O_2\left(g\right)\ +\ Heat\ \leftrightarrow\ 2NO\left(g\right)$$  

Predict the direction the equilibrium will shift if the amount of heat is increased.

• To the product side

• To the reactant side

• There will be no shift

Multiple Choice

Given the following reaction: $$N_2\left(g\right)\ +\ O_2\left(g\right)\ +\ Heat\ \leftrightarrow\ 2NO\left(g\right)$$  

Predict the direction the equilibrium will shift if the pressure is increased.

• To the product side

• To the reactant side

• There will be no shift

Multiple Choice

In procedure step 3, what happened when 1 drop of acid was added to well A1?

• The solution turned yellow

• The solution stayed blue

Open Ended

Why do you think the solution changed in that way? Think back to the equilibrium reaction for bromophenol blue.

Multiple Choice

In procedure step 4, what happened when 1 drop of base was added to well A3?

• The solution turned yellow

• The solution stayed blue

Open Ended

Why do you think the solution changed in that way? Think back to the equilibrium reaction for bromophenol blue.

Open Ended

What do you think was going on in step 5 of the procedure? How did we get A1 to switch to blue and A3 to switch to yellow?

Open Ended

What do you think was going on in step 8 of the procedure? How did we get A1 to switch back to yellow and A3 to switch back to blue?