Order

[Rhea Shah 2F]

How do you know which order rate law to use for a reaction?

[Juliana Chopelas 1A]

You can look at the reactions graph. Which ever graph produces a straight line will give you the reaction order. For zero order the graph would be (A) v time and would give a straight line with a -slope. First order reaction would be ln(A) v time and would give a straight line with a -slope. Second order would be 1/(A) v time and would give a straight line with a +slope.

[205154661_Dis2J]

You can look at the graphs provided or you can look at the units used in a specific problem if they do not specifically tell you which order it is. That is why it is important to know and memorize the units for the orders!

[Eva Zhao 4I]

Here is a diagram of the graphs mentioned above, in case you might find it helpful:

[805097738]

You can look at the reactions graph. Which ever graph produces a straight line will give you the reaction order. For zero order the graph would be (A) v time and would give a straight line with a -slope. First order reaction would be ln(A) v time and would give a straight line with a -slope. Second order would be 1/(A) v time and would give a straight line with a +slope.

are these graphs always labeled to clearly see that? because the line for zero and first both have -slope

[Jack Riley 4f]

you look at the graph and compare it with the 3 possible orders to determine which one best fits the graph shown