Chem Lesson 2: 12.4 - 12.6 Flashcards
Integrated Rate Laws
Let’s us see the concentration of a reactant at any given time.
Integrated Rate Law (Zero Order Equation)
[A]f = [A]o - kt
Integrated Rate Law (First Order Equation)
ln[A] = ln[A]o - kt
Integrated Rate Law (Second Order Equation)
1/[A] = 1/[A]o + kt
K Unit for Zero Order
M^1t^-1
K Unit for First Order
t^-1
K Unit for Second Order
M^-1t^-1
Yes or No - Does the half life of a first order reaction depend on the initial concentration.
No
Half Life - Zero Order Reaction
[Ao] / 2k
Half Life - First Order Reaction (Mysterio)
ln*2 / k
0.693 / k
Half Life - Second Order Reaction
1 / (k * [Ao])
K Unit for Third Order
M^-2 t^-1
Decaying Order
First Order
How to cancel Ln out?
Raise both sides to the e^ power.
100% in Integer form
100
100% in Fraction form
1
Collision Theory
Requirements that need to take place for a chemical reaction to occur:
1. Collision (must collide).
2. Proper orientation.
3. Sufficient energy (to get over activation barrier).
Arrhenius Equation (def)
Relates activation energy and the rate constant (k).
Arrhenius Equation (Exponential equation - before two point)
k = Ae^-Ea/RT
Arrhenius Equation (Y = mx + b)
ln(k) = - Ea/R(1/T) + lnA
Frequency Factor (A) - Arrhenius Equation (Definition for A)
Fraction of molecules that have the proper orientation when they collide.
R (energy constant value for rate law)
8.314 J/mol * k
Transition states
Short lived molecules formed in between reactants turning into products.
(Forms when E,a is met - top point of graph).
(e^-Ea/RT) def in Arrenius Equation
Fraction of molecules that have enough energy to get over the activation energy barrier.