General Chemistry

Question 0

First order reactions

Answer 0

Rate proportional to the concentration of one reactant. Units=1/s
[At] = [Ao] e^-kt At= conc of A at time t, Ao=initial conc, k=rate constant, t=elapsed time
Another way to represent the equation:
ln[A] = ln[Ao] - kt
decay= t1/2=.693/k if they say by factor of 4 it’s 2 half lifes

Question 1

Zero Order Reactions

Answer 1

Has a constant rate. Units: Mol/L S
Rate = k
[A] = [Ao] - (ko) (t)
Ao=initial conc of A, ko= zero order rate constant, t= time
Half life = 1/2 Ao/ko

Question 2

Second order reactions

Answer 2

rate=k[B]^2 or rate=k[A][B], etc.

Units: L/mol S

Question 3

Collision theory equation

Answer 3

rate = fz

f=# of collisions that are effective, z= total # of collisions/second