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Home/ Chem 109H Fall 2009/ Contents contributed and discussions participated by YJ Choi

Contents contributed and discussions participated by YJ Choi

YJ Choi

pH and pOH - 1 views

  • Taking the antilog of both sides, we have
    • YJ Choi
       
      Is there a typo in the following equation?
  • There is a very simple relationship between the pH and the pOH of an aqueous solution at 25°C. We know that at this temperature
    • YJ Choi
       
      Isn't the second "Kw" in the following equation redundant?
YJ Choi

The Rate Equation - 2 views

  • . In the figure the tangents at t = 15 shave been drawn
    • YJ Choi
       
      From "...tangents at t=15 SHAVE been drawn" to "...tangents at t=15 HAVE been drawn"
  • We say that the order of the reaction with respect to component A is a, while the order with respect to B is b. The overall order of the reaction is a + b.
  • When this happens the reaction is said to be zero order in H3O+, because (cH,sub>3O+</sub>)0 = 1
    • YJ Choi
       
      notation in parentheses should be fixed
YJ Choi

The Nature of Electromagnetic Radiation - 0 views

  • Figure 1
    • YJ Choi
YJ Choi

Atomic Structure and Isotopes - 0 views

  • When particles are emitted into a closed container, they slowly pick up electrons from their surroundings, and eventually the container becomes filled with helium
    • YJ Choi
       
      I wonder if this is how Helium gas is industrially manufactured
YJ Choi

Analysis of Compounds - 0 views

  • A combustion train. H2O and C2O, produced by combination of O2 with H and C in the sample, are selectively absorbed by tubes containing Dehydrite [Mg(ClO4)2•3H2O] and ascarite (NaOH on asbestos).
    • YJ Choi
       
      "CO2" instead of "C2O"
YJ Choi

Equations and Mass Relationships - 0 views

  • Similarly, the ratio of the amount of[[Image:]]produced to the amount of[[Image:]]
    • YJ Choi
       
      Images are missing
YJ Choi

Using Chemical Equations in Calculations - 0 views

  • invo1ving
    • YJ Choi
       
      typo: "involving"
YJ Choi

Balancing Chemical Equations - 0 views

  • 2NaMnO4 + H2O2 + 3H2SO4 → 2MnSO2 + Na2SO4 + 3O2 + 4H2O
    • YJ Choi
       
      Shouldn't the coefficient on Oxygen gas on the product side be a "10" instead of a "3"?
  • 2NaMnO4 + H2O2 + 3H2SO4 → 2MnSO2 + Na2SO4 + 6O2 + 4H2O
    • YJ Choi
       
      I counted 22 Oxygen atoms on the reactant side, and so shouldn't the red "6" be a "5" to equal 22 Oxygen atoms on the product side? (Sorry to bother the editor again)
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