exam 3 ch 14 collision theory

Question 1

Collision theory

Answer 1

For a reaction to occur, molecules must:

-Collide
-Have proper orientation
-Have enough energy to cause a reaction

-All energy must come from the kinetic energy of reactants
-If collision energy is >_ Ea energy, reactants can be converted

Question 2

Fraction of collisions equation

Answer 2

f = 1 / e^(Ea / RT)

As Ea up, 1/e^ down, f down
As T down ,Ea/RT up, f up

Question 3

Arrhenius equation

Answer 3

k = Ae^(-Ea/RT)

linear:

lnk = (-Ea/R)(1/T) + lnA

-rate constant depends on temperature and activation energy

Question 4

Arrhenius equation 2 point form

Answer 4

ln(k2/k1) = -Ea/R (1/T2 - 1/T1)

Question 5

Plotting kinetic data

Answer 5

1. Measure rate at multiple temps
2. Plot ln(k) vs 1 / T
3. Slope is equal to -Ea/R

LINEAR EQUATION

Question 6

Ratio of temps, what factor is k at the higher temp?

Answer 6

ln(k2/k1) = T2 (higher) is that many times faster

solve right side of 2 point then take e^ of that to get ratio

Question 7

Transition state

Answer 7

-Higher energy intermediate state between reactants and products
-On graph

Question 8

Activated complex

Answer 8

-Real short-lived structure of atoms rearranging near transition state