Chemical Kinetics

Question 1

Arrhenius equation

Answer 1

k = Ae^-(Ea/RT)

• A = freq collisions, coef
• Ea: activaiotn energy
• R: ideal gas constant
• T: temp (K)

Question 2

What are the two factors influence rate constant? and how?

Answer 2

Ea: activation energy, inversely proportional
T: directly proportional

Lower activation energy, increases rate constant
Incr temp: incr rate constant

Ea: more frequently manipulated

Question 3

0 Order vs 1st Order

Answer 3

M/S vs 1/S

Question 4

Endo vs Exothermic

Answer 4

Endothermic: delta H > 0
- products more energy than reactants

Exothermic: delta H <0
- reactants more than products

Question 5

Units of rate

Answer 5

Molarity/Sec

- units of molarity are Mol/Liter

Question 6

What is the overall rate order of a rate equation?

Answer 6

add up exponents

Question 7

True or false: rate order can be determined with stoichometry

Answer 7

false: need to test experimentally as well

Question 8

What are common 0 order reactions

Answer 8

• radioactive decay and SN1

Question 9

what are common 2nd order reations

Answer 9

• collission and SN2

Question 10

Formula for Kcat

Answer 10

Vmax / E total

Question 11

Formula for catalytic efficiency

Answer 11

Kcat / km

• Kcat = Vmax / E total
• Vmax = k cat * E total