1. Chemical Kinetics Thermodynamics – does a reaction take place?
Kinetics – how does a reaction proceed (reaction mechanism) and how fast (reaction rate).
Reaction rate is the change in the concentration of a reactant or a product with time (Units: mol/Ls).
R P
rate = -
D[R] Dt
D[R] = change in [reactants] over a time period Dt
rate =
D[P] Dt
D[P] = change in [products] over a time period Dt
Because [R] decreases with time, D[R] is negative.

2. A B
time
rate = -
D[A] Dt
rate =
D[B] Dt

3. Br2 (aq) + HCOOH (aq) 2Br- (aq) + 2H+ (aq) + CO2 (g)
slope of
tangent
slope of
tangent
slope of
tangent
average rate = -
D[Br2] Dt
= -
[Br2]final – [Br2]initial
tfinal - tinitial
instantaneous rate = rate for specific instance in time

4. Practice!
Read p
p #1-11
p. 366 #1-3ab (omit 2e)