Exam 2 Formula (Memorize) Flashcards
(26 cards)
What is the half life formula for “First Order Overall Order”
t1/2 = .693/k
What is the half life formula for “Second Order Overall Order”
1/k[A]0
What is the half life formula for “Zero Order Overall Order”
[A]0/2k
What is the fraction for rate?
(Change) Concentration/ (Change) Time; always positive
What are the factors that affect Reaction Rates
- Catalyst
- Orientation of Molecules
- Concentration
- Temperature
- Surface Area
What are the units for the “First Order”
s^-1 or 1/s
What are the units for the “Second Order”
M^-1/s^-1
What are the units for the “Zero Order”
M/s^-1
Rate Law
rate2/rate1 = ([conc. A2]/[conc. A1])^n
What is the value of the “R Constant” for the Arrhenius Equation
8.314 J/mol-k
What is Reaction Quotient (Q)
Way to express amounts of reactants & products present at any point in a reversible reaction
What is Equilibrium Constant (K)
Value of Q when reaction is at equilibrium
Between K & Q, which is dependent on Temperature
A) K
B) Q
Equilibrium Constant (K)
What happens to the reaction if Q > K
A) Reverse reaction proceeds
B) Forward reaction proceeds
C) System is @ equilibrium
A; Reverse reactions proceeds
What happens to the reaction if K > Q
A) Reverse reaction proceeds
B) Forward reaction proceeds
C) System is @ equilibrium
B; Forward reaction proceeds
What is Kc
Molar concentration @ equilibrium
What does decreasing the volume do if there are more moles of gases on products v reactants…
A) shift towards products
B) shift towards reactants
C) No change
B; Shift towards the reactants
Which half life/integrated rate law gives you a positive slope
A) First Order
B) Second Order
C) Zero Order
C & B; Second & Zero Order
What is the formula for Gibbs Free Energy under certain conditions (∆G)
∆H - T∆S
What is the formula for Gibbs Free Energy Change under standard conditions (∆G°)
-RTlnK
What is Kw @ 25C
1 * 10^-14
How do you relate [OH-] & [H3O+] in regard to Kw
Kw = [OH-][H3O+]
How do you find pKw in regard to pH & pOH
pKw = pH + pOH
How do you find pH
-log[H+]
