Consider the equilibrium system shown on the right. A number of stresses have been applied and the response recorded in the concentration vs time graph shown on the right.

1. What is the best explanation for the likely stress applied to the system at t₁

2. Compare the value of the reaction quotient (Q_c ) between t₂ and t₃  and the reaction quotient between t₄
and t₅.

3. What was the likely stress applied to the system at t₃ 

4. What was the likely stress applied to the system at t₅

5. What was the likely stress applied to the system at t₆

6. Compare the value of the reaction quotient (Q_c ) at t₇  and the reaction quotient at t₄.

3. Consider the equilibrium system shown on the right.

Click to download a word document with the concentration vs time graph shown on the right. Print this document and complete the graph indicating the following stresses and the response from the system.

a. The system reaches equilibrium withing 12 seconds.

b. Then the following stresses are applied.

    i.    CO is added and its concentration increases to 2.2M

    ii.    Equilibrium is re-established within 5 seconds.   
          Where at the 35 second mark the temperature is 
          reduced and equilibrium is reached within 5 seconds

    iii.   At 40 seconds a catalyst is added.

    iv.   At 45 seconds COCl₂ is added.

     v.   The volume of the reaction vessel is increased by
           10%.