Practice Quiz (Part 2)

1. 1A particular first-order reaction has a rant constant of 0.0136 s^-1. What is the half-life for this reaction?

   1. A1.77 s
   2. B50.7 s
   3. C73.1 s
   4. D0.0136 s
2. 2Determine the molecularity of the following elementary reaction:
   O3 → O2 + O

   1. AUnimolecular
   2. BBimolecular
   3. CTermolecular
   4. DMolecularity cannot be determined
3. 3The reaction 2H2O2 → 2H2O + O2 has the following mechanism:
   H2O2 + I- → H2O + IO-
   H2O2 + IO- → H2O + O2 + I-
   The catalyst in the reaction is:

   1. AH2O
   2. BH2O2
   3. CI-
   4. DIO-
4. 4Which of the following statements is typically true for a catalyst?

   1. AThe concentration of the catalyst will go down as a reaction proceeds
   2. BThe catalyst provides a new pathway in the reaction mechanism
   3. CThe catalyst speeds up the reaction
5. 5When solid ammonium hydrogen sulfide, NH4SH, undergoes thermal decomposition, ammonia gas and hydrogen sulfide gas are formed.
   NH4SH (s) <=> NH3 (g) + H2S (g)
   The Kc for this reaction is: Kc [NH3][H2S]
   Which is the correct set-up for the Kp expression?

   1. AKp = [NH3][H2S]
   2. BKp = [NH3][H2S] / [NH4SH]
   3. CKp = (P NH3)(P H2S)
   4. DKp = (P NH3)(P H2S) / (P NH4SH)
6. 6What is the relationship between Kp and Kc? (T = temperature, R = ideal gas constant, ∆n = change in moles)

   1. AKp = Kc(RT)^∆n
   2. BKp = Kc / (RT)^∆n
   3. CKp = Kc
   4. DKp = Kc(RT)
7. 7Which of the following best describes the term "amphiprotic?"

   1. AA standard solution added to the sample in a titration
   2. BA substance that completely dissociates into ions in aqueous solutions
   3. CA substance that can behave as either a proton acceptor or a proton donor
   4. DA substance that only partially dissociates in aqueous solutions
8. 8Which of the following is the equilibrium constant expression for the dissociation of the weak acid HOCl?

   1. AK = [H+][OCl-] / [HOCl]
   2. BK = [H+][OCl-]
   3. CK = [HOCl] / [H+][OCl-]
   4. DK = [H+][O^2-][Cl-] / [HOCl]
9. 9Which of the following is a conjugate acid/base pair?

   1. AHCl and OCl-
   2. BH2SO4 and SO4^2-
   3. CNH4^+ and NH3
   4. DH3O+ and OH-
10. 10Name the four important factors which affect the rates of chemical reactions:
    [blank_start]Concentrations of reactants[blank_end]
    [blank_start]Surface area of solid reactant/catalyst[blank_end]
    [blank_start]Temperature of the reaction[blank_end]
    [blank_start]Pressure of a catalyst[blank_end]

    1. AConcentrations of reactants
    2. BSurface area of solid reactant/catalyst
    3. CTemperature of the reaction
    4. DPressure of a catalyst

Description

Practice quiz #2 for the final exam

Author

Kristen Wislowski

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English

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