Chemical Kinetics (Rate laws)
What is the relative rate of the reaction in terms of disappearance and formation for the reaction?
N2O5(g) --> NO2(g) + O2(g)
-1/2(Δ[N2O5]/Δt) = 1/4(Δ[NO2]/Δt) = (Δ[O2]/Δt)
What is the Arrhenius equation?
k = Ae-Ea/RT
lnk = lnA-(Ea/RT)
ln(k2/k1) = -Ea/R (1/T2-1/T1)
Write the correct equilibrium expression for the following chemical reaction.
NH4HS(s) <--> NH3(g) + H2S(g)
Keq = [NH3][H2S]
Identify the definition of an Arrhenius acid/base and Bronsted-Lowry acid/base.
Arrhenius definition - Acid makes H+; Base makes OH-
Bronsted-Lowry definition - Acid donates proton; Base accepts proton
England / United Kingdom
For the reaction, M(aq) --> Products(aq), the concentration of M changes as follows...
0s -- 3.0M
5s -- 2.52M
10s-- 2.12M
15s -- 1.80M
20s --1.54M
25s -- 1.32M
Calculate the average rate of decomposition of M between
1) 0-10s
2) 15-20s
3) 5-20s
1) 0.088M/s
2) 0.052M/s
3) 0.0653M/s
Which of the following can be identified as the catalyst in the reaction?
2CH3CHO(aq) + 0.005I2(aq) --> 2CH4(g) + 2CO(g) + 0.005I2(aq)
I2
At 400K, a reaction has a concentration equilibrium constant of Kc=2.50. Calculate the partial pressure equilibrium constant for this reaction.
SO2(g) + O2(g) <--> SO3(g)
Kp = 0.0762
Name all the strong acids and strong bases.
Strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, HClO3
Strong bases: LiOH, NaOH, KOH, RbOH, Ca(OH)2, Ba(OH)2, Sr(OH)2
What is the name of the yellow, round video game character who navigates mazes while eating dots and escaping ghosts like Blinky, Pinky, Inky, and Clyde?
Pac-man
A reaction follows the rate law: rate=k[P]2[Q]2
What are the correct units for the rate constant?
A specific chemical reaction has a rate constant of k=0.0450s-1 and an activation energy of 52.0kJ/mol at a temperature of 298K. Calculate the collision frequency factor for this reaction.
A=5.61x107s-1
The reaction below has an equilibrium constant for Kc=1.8x10-5 at a certain temperature. If an equilibrium mixture in a container holds [CH3COOH]=0.20M and [CH3COO-]=3.0x10-3M, what is the equilibrium concentration of [H+]?
CH3COOH(aq) <--> CH3COO-(aq) + H+(aq)
[H+]=1.2x10-3M
Predict the chemical formula of the two products formed in the following acid-base reaction, and identify the acid, base, conjugate acid, and conjugate base.
HNO2(aq) + PO4-3(aq) <--> Product 1 + Product 2
HNO2(aq) - Acid
PO4-3(aq) - Base
NO2-(aq) - Conjugate Base
HPO4-2(aq) - Conjugate Acid
Before moving to Washington D.C., what city served as the very first official capital of the United States under the Constitution?
New York City
A zero-order reaction has an initial concentration [D]0=1.20M with a rate constant of k=0.050M/s. How long will it take for [D] to reach 0.300M?
t=18s
The decomposition of an organic compound has an activation energy of Ea=65.0kJ/mol. At a 25C, the rate constant is k=0.0120s-1. What will the rate constant be if the temperature is raised to 55C?
k=0.126s-1
Consider the following equilibrium system.
N2O4(g) <--> NO2(g) ; ΔH=+57.2kJ
Which way will the reaction shift if...
1) The volume of the container is suddenly compressed to half its size
2) Pure N2O4(g) is continously added to the container
1) Shifts left
2) Shifts right
2.0x10-12M
In 1919, a massive tank holding a highly viscous chemical mixture ruptured in Boston, creating a 15-foot tall wave that traveled through the streets. What sweet substance caused this bizarre industrial disaster?
Molasses
A specific chemical reaction follows second-order kinetics. It has a measured half-life of 45.0s when the initial concentration of the reactant is 0.600M. Calculate the exact concentration remaining after the reaction has run for 3.00min.
[A]t = 0.120M
An industrial chemical process is monitored at two different settings. At 300K, the rate constant is 0.00850s-1. When heated to 360K, the rate constant dramatically accelerates to 0.450s-1. Calculate the frequency factor for this reaction.
A=1.87x108s-1
If a team modifies the system by 1) increasing the temperature, 2) doubling the volume of the container, and 3) decreasing the pressure, describe the direction of the shift for the changes.
NO(g) + O2(g) <--> NO2(g) ; ΔH = -114kJ
1) Shift left
2) Shift left
3) Shift left
A weak acid has a measured Ka value of 4.0x10-6 at 25C. What is the pKa of the acid and Kb value of its conjugate base.
pKa = 4.40
Kb = 2.5x10-9
How many total keys are on a standard, modern piano?
88 keys (52 white keys and 36 black keys)