# Question #e6605

##### 1 Answer

You can do it like this:

#### Explanation:

I will confine the answer to a 1st order reaction.

Suppose we have:

For a 1st order reaction we have:

Where **k** is the rate constant.

This can be expressed in terms of the rate of disappearance of *A* :

Rearranging and applying integration between 0 and t gives:

This gives:

You can see that this is a straight line graph of the form

This means if we plot **t** the gradient will be equal to **-k** and the intercept will be

Here is an example for the breakdown of ozone by light:

See if you can measure the gradient yourself to give you **-k.**

If you read off the intercept i.e the point where the graph cuts the y axis, this will give you the value of

You can get