Chemical Kinetics
Given the following proposed mechanism, please identify the catalyst. O3 + O → 2O2 (overall reaction)
Mechanism:
O2 + Cl → ClO + O2
ClO + O → Cl + O2
What is Cl?
An equilibrium constant is expressed as...
What is products over reactants (and just aqueous and gas)?
The strongest acid is...
What is HClO4 (Perchloric acid)?
The Second Law of Thermodynamics states that for any spontaneous reaction, _______ is positive
What is ΔSuniv?
Electrochemistry is...
What is the study of chemical processes that cause electrons to move (electron transfer)?
What is the overall order of the following reaction, given the rate law?
NO(g) + O3(g) → NO2(g) + O2(g) Rate = k[NO][O3]
What is Second Order?
Given the following proposed mechanism, predict the rate law for the overall reaction
2NO2 + CO → NO + CO2 (overall reaction) Mechanism:
2NO2(g) → NO3(g) + NO(g) (Slow)
NO3(g) + CO(g) → NO2(g) + CO2(g) (Fast)
What is Rate = k[NO2]2
The strongest base is...
What is OH- (Hydroxide)
Identify the change in state that does NOT have an increase in entropy.
A) dry ice subliming
B) popsicle melting
C) gasoline evaporating
D) water freezing
E) water boiling
What is water freezing (D)?
For a spontaneous reaction, we should have what in regards to ΔSuniv and ΔGrxn...
What is ΔSuniv> 0; ΔGrxn < 0?
The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10-4 s-1. If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s?
What is 0.86 M?
Balance this equation and determine the correct equilibrium constant expression
GaBr3 + Na2CO3 = NaBr + Ga2(CO3)3
What is
[NaBr]6[Ga2(CO3)3]
[GaBr3]2[Na2CO3]3
Calculate the pH for an aqueous solution of pyridine that contains 4.15 x 10-4 M hydroxide ion.
What is 10.62 pH?
Consider the following reaction at constant pressure. Use the information here to determine the value of ΔSsurr at 355 K.
2NO(g) + O2(g) → 2NO2(g) ΔH = −114 kJ
What is ΔSsurr = +321 J/K?
Identify the number of electrons in the balanced oxidation half-reaction of the following redox reaction in acidic medium.
Cr2O72- + H2S →Cr3+ + S
What is 6 electrons?
The first-order rearrangement of CH3NC is measured to have a rate constant of 3.61 × 10-15 s-1 at 298 K and a rate constant of 8.66 × 10-7 s-1 at 425 K. Determine the activation energy for this reaction.
What is 160 kJ/mol?
Consider the following reaction at equilibrium. What effect will reducing the volume of the reaction mixture have on the system?
XeF4(g) ⇌ Xe(g) + 2F2(g)
What is the reaction will shift to the left in the direction of reactants.
Calculate the pH of a 0.400 M KBrO solution. Ka for hypobromous acid, HBrO, is 2.0 × 10-9
What is 11.15 pH?
Below what temperature does the following reaction become nonspontaneous?
2HNO3(aq) + NO(g) → 3NO2(g) + H2O(l)
ΔH = +136.5 kJ; ΔS = +287.5 J/K
When T<475 K the reaction will be nonspontaneous.
The 𝐸𝑐𝑒𝑙𝑙 ° for the cell using the overall cell reaction below is +0.48 V:
Zn(s) + Ni2+(aq) → Zn2+(aq) + Ni(s)
Please calculate the 𝐸𝑐𝑒𝑙𝑙 when [Ni2+] = 0.100 M and [Zn2+]= 1.50 M
What is 0.45 V?
Carbon-14 has a half-life of 5720 years and this is a first-order reaction. If a piece of wood has converted 88.5% of the carbon-14, how old would it be?
What is 1.785 × 104 years?
The equilibrium constant is equal to 5.00 at 1300 K for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g). If initial concentrations are [SO2] = 11.0 M, [O2] = 0.535 M, and [SO3] = 18.0 M, the system is
What is at equilibrium?
A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HF is 3.5 × 10-4.
What is 3.09 pH?
Which of the following processes has a ΔSsys > 0?
A) carbon dioxide(g) → carbon dioxide(s)
B) water freezes
C) isopropyl alcohol condenses
D) ethanol (g, at 555 K) → ethanol (g, at 400 K)
E) dry ice subliming
What is E (dry ice sublimes)?
Balance the following redox reaction if it occurs in basic solution.
Cr(OH)4-(aq) + ClO-(aq) → CrO42-(aq) + Cl-(aq)
What is 2Cr(OH)4- − + 2OH- + 3ClO- → 2CrO42- + 5H2O + Cl-