Kinetics
Equilibrium
Acids/Bases
Electrochemistry
Misc
100
Write a balanced reaction for this relationship to be true:
Rate = (-1/2)(Δ[N2O5]/Δt) = (+1/4)(Δ[NO2]/Δt) = +(ΔO2/Δt)
What is 2N2O5 -----> 4NO2 + O2?
100
Find the partial pressure of NO at equilibrium for
N2(g)+O2(g)<--->2NO(g)
PN2=0.780 atm PO2=0.209 atm
Kp = 4.1*10^-19
2.6*10^-10
100
Find the pH of a 0.0267 M solution of HI.
1.57
100
What is the oxidation number of one atom of chromium in the anion Cr2O72-?
+6
100
What does a catalyst do?
Lowers activation energy
200
Given the rate of disappearance of O2 is -0.48 M/s, what is the rate of appearance of CO2?
C2H4 + 3O2 ---> 2CO2 + 2H2O?
What is +0.32 M/s?
200
Find Kp for 3A (g) <--> 2B (g) at 298K. Kc = 6.6*10^-10
2.7*10^-11
200
Identify the conjugate base of:
NH3
HSO4 -
HPO4 2-
HCN
NH2-
SO4 2-
PO4 3-
CN -
200
MnO4- + Pb2+ --> Mn2+ + Pb4+
Identify what atom is being oxidized and what is being reduced.
Lead is oxidized
Manganese is reduced
200
Fill in the blank:
144Ce --> 144Pr + ____
Beta particle
300
Write out all possible rate equations
3A --> B + 2C
What is Rate = (-1/3)(Δ[A]/Δt) = +(Δ[B]/Δt) = +(1/2)(Δ[C]/Δt)?
300
If Q is greater than K, the equilibrium shifts to ___________
form more reactants
300
A generic weak acid HA has a Ka of 2.3*10^-7. Find the pH of a 0.25 M solution of HA.
3.6
300
Zn2+ (aq) + 2 e --> Zn (s) E°red = -0.7621 V
Cu2+ (aq) + 2 e --> Cu (s) E°red = +0.3394 V
Find Eocell.
1.102 V
300
Find ΔH given that ΔS of the surroundings is 102.4 J/K at standard conditions. Express the answer in units of kJ.
-30.5 kJ
400
A reactant decomposes via a second order process. The rate constant is 9.3*10^-6 M^-1*s^-1. If there is 0.06 M of the reactant, what is the reaction rate?
3.35*10^-8 M/s
400
Which factor affects the value of K?
a. pressure/volume change
b. temperature change
c. presence of a catalyst
B
400
A buffer solution has a pH of 3.6 and a pKa of 4.1. Find the value of x, the ratio between the concentration of base and acid.
0.32
400
Determine [Fe2+] for the following galvanic cell at 25ºC if given [Sn2+] = 0.072 M, [Fe3+] = 0.0219 M, and [Sn4+] = 0.00345 M.
Sn2+ (aq) + 2 Fe3+ (aq) ⇌ Sn4+ (aq) + 2 Fe2+ (aq)
Ecell = + 0.68 V
Standard Reduction Potentials
Sn4+ (aq) + 2 e– →. Sn2+ (aq) E°red = +0.151 V
Fe3+ (aq) + e– → Fe2+ (aq) E°red = +0.771 V
0.00968 M
400
Find ΔS of the universe given that ΔH = -102.4 kJ in standard conditions.
H2 + I2 --> 2HI
S° of H2 = 57.0 J/K
S° of I2 = 210.3 J/K
S° of HI = 507.9 J/K
1092 J/K
500
Find the average rate between 0s and 100s for H2 + I2 --> 2HI
(at 0s [H2] = 1 M and [HI] = 0 M. At 100s [H2] = 0.135 M and [HI] = 1.730).
8.65*10^-3 M/s
500
What does a value of K greater than 1 tell us about E cell?
E cell is positive
500
List the 6 strong acids. You have ten seconds.
HCl, HBr, HI, HClO3, HNO3, H2SO4
500
Come up to the whiteboard and draw this battery.
Mg | Mg2+ || Fe3+ | Fe2+
500
A neutron is shot at a Uranium-235 nucleus, making it into an unstable Uranium-236 isotope. Its fission products are Cesium-141 and Rubidium-92. How many neutrons fly out in the process?
3