Chapter 5

Question 1

Reaction Rates

Answer 1

Question 2

Rate Law
Overall order of a reaction

Answer 2

rate = k[A]^x[B]^y
x + y

Determined experimentally

Question 3

Zero Order

Answer 3

rate = k = M/s

Question 4

First Order Reactions
Half-Life

Answer 4

rate = k[A]

k = /s

[A<sub>t</sub>] = [A<sub>0</sub>]e<sup>-kt</sup>
t<sub>1/2</sub> = ln2/ k

t_1/2 = 0.693/ k

Question 5

Second Order Reactions

Answer 5

rate = k[A][B] or [A]²

k = /M*s

Question 6

Efficeincy of Reactions
Collision Theory of Chemical Kinetics

Answer 6

rate = fZ

f = frequency of collisions

Z = fraction of effective collisions

Question 7

Enthalpy Change

Answer 7

ΔH = Potential Energy of products - reactans

-ΔH = exothermic = Heat Given

+ΔH = endothermic = Heat Absorbed

Question 8

Potential Energy Diagram

Answer 8

Question 9

Law of Mass Action

Answer 9

2A ⇔ B + C

rate_f = k_f[A]²

rate_r = k_r[B][C]

Question 10

Equilibrium Constant

Answer 10

K_c = [B][C]/[A]²

Kc = k₁k₂/k_-1k_-2

Question 11

Properties of Equilibrium Constant

Answer 11

Solid and pure liquids excluded
K_eq changes with temperature

Keq >> 1 = Reactants favoured

Keq << 1 = Products favoured

Q >> Keq = Shift to products

Q << Keq = Shift to reactants

Question 12

Le Chatlier Principle

Answer 12