Theories Of Reaction Rates

Step 1: Rate expression.
For the reaction:

2A%20%5Clongrightarrow%20%5Ctext%7BProducts%7D

%5Ctext%7BRate%7D%20%3D%20-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7B%5CDelta%20%5BA%5D%7D%7B%5CDelta%20t%7D

Step 2: Change in concentration of A.
Initial

%5BA%5D%20%3D%200.5

mol L

%5E%7B-1%7D

Final

%5BA%5D%20%3D%200.4

mol L

%5E%7B-1%7D

%5CDelta%20%5BA%5D%20%3D%200.4%20-%200.5%20%3D%20-0.1%20%5C%2C%20%5Ctext%7Bmol%20L%7D%5E%7B-1%7D

Step 3: Time interval.

%5CDelta%20t%20%3D%2010%20%5C%2C%20%5Ctext%7Bmin%7D%20%3D%20600%20%5C%2C%20%5Ctext%7Bs%7D

Step 4: Calculate rate.

%5Ctext%7BRate%7D%20%3D%20-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7B%5CDelta%20%5BA%5D%7D%7B%5CDelta%20t%7D%20%3D%20-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7B-0.1%7D%7B600%7D

%5Ctext%7BRate%7D%20%3D%20%5Cfrac%7B0.1%7D%7B1200%7D%20%3D%208.33%20%5Ctimes%2010%5E%7B-5%7D%20%5C%2C%20%5Ctext%7Bmol%20L%7D%5E%7B-1%7D%5Ctext%7Bs%7D%5E%7B-1%7D

Conclusion:
The rate of reaction during the given time interval is:

%5Cboxed%7B8.33%20%5Ctimes%2010%5E%7B-5%7D%20%5C%2C%20%5Ctext%7Bmol%20L%7D%5E%7B-1%7D%5Ctext%7Bs%7D%5E%7B-1%7D%7D

Chapter Questions
1 MCQs