Kinetics Flashcards
1
Q
Rate law
A
v = k[A] [B]
k = rate of constant
2
Q
Elementary reaction
A
A reaction that occurs in ONE STEP
3
Q
Molecularity
A
The number of molecules involved in an elementary reaction.
4
Q
Arrhenius equation
A
k=Ae^(-Ea/RT)
- k = rate constant
- A = pre-exponential factor
- Ea = Activation energy
- R = gas constant
- T = absolute temp (kelvin)
5
Q
First order [rate law]
A
v = -d[A]/dt or -d[B]/dt
Rate law: v = k[A]
6
Q
Unimolecular reaction
A
A -> B
Always first order
7
Q
Bimolecular reaction
Second rate law
A
- A+B->product
v = -d[A]/dt = -d[B]/dt = d[C]/dt
Rate law: v = k[A][B] - A+A-> Product
v = -1/2d[A]/dt = d[C]/dt
Rate law: v = k[A]^2
Bimolecular reactions are ALWAYS second order
8
Q
Trimolecular reaction
Rare
A
Rate laws:
* v = k[A]^3
* v = k[A]^2[B]
* v = k[A][B][C]
9
Q
t 1/2
A
The time after which half of the initial reactant has reacted.
[A] = ([A]_0) /2
10
Q
Zero order
A
Reaction is INDEPENDENT of reactant concentration.
Ergo Rate law: v = k
11
Q
Zero order half-time
A
t1/2 = ([A]_0)/2K
12
Q
Gradient of line (Zero order)
A
-k
13
Q
Gradient of line (first order)
A
-k
