AP Chemistry Unit 4: Kinetics and Equilibrium

Kinetics

Determines how fast a reaction takes place or rate of reaction.

Instantaneous Rate

Rate at a given time (t).

Rate Law

How a rate changes as the [ ] changes.

k

Rate constant.

Rate

Change in concentration/change in time.

The only thing that can change k?

Temperature

Half Life

The time it takes for 1/2 the amount of starting material to react.

What is the reaction order if there’s a constant half life?

Then it’s a second order rate law.

What is the reaction order if the half life changes?

Then it’’s a zeroth order rate law.

Collision Theory

The rate of reaction is proportional to the number of effective collisions.