I have another question, though. it's number 75 in the same practice test: http://i49.tinypic.com/2hedqb5.jpg

The answer is B. Why is B wrong? the explanation says it is at equilibrium at 14 minutes. i don't get this.

Question

I have another question, though. it's number 75 in the same practice test: http://i49.tinypic.com/2hedqb5.jpg

The answer is B. Why is B wrong? the explanation says it is at equilibrium at 14 minutes. i don't get this.

anonymous · Answer

According to the diagram given, at 4th minute, the concentration of the A+B is same as C+D. But then their concentration keeps changing, c and D increase while a and b decrease). This tell you that the reaction is more towards right hand side i.e. rate of c+d formation is greater than the rate of formation of a+b. So these 2 reactions are not in equilibrium.

at the 14th minutes, c+d concentration and a+b concentration become constant. This means the forward and backward reaction are in equilibrium.

I hope this help. Correct me if i'm wrong.

anonymous · Answer

no, u r correct. I understood. I didn't get the part of chemical equilibrium but i kind of get it now. thanks!