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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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sholland90 sholland90
wrote...
12 years ago
Suppose I melted a green popsicle and ran a chromatogram of the resulting substrate.
  (1 pts.) In the simplist case, what would I expect to see? Include as much
     detail as possible.

Answer:

[ii] (4 pts.) Suppose that the dot/area representing the longest wavelength of 
    color in this situation was located 29 mm from the baseline, and the dot/area
    representing the shortest wavelength of color was located 44 mm from the
    baseline (see Figure 9.4 on page 288 for help). If the solvent traveled 65 mm 
    from the baseline, what was the Rf for each of these two components of the
    sample?
    [SHOW ALL WORK]

   Answer:

[iii] (2 pts.) What does this mean? Why, in this case, would one component of the sample travel farther than the other? What’s going on here—what causes this to happen?

Answer:

(d) (2 pts) What is the difference between the stationary phase and the mobile phase as it relates to this lab? What was the stationary phase in this demonstration? What was the mobile phase in this demonstration?

Answer:


(a) (1 pts.) Please state in the blanks provided whether the following samples from the lab were an electrolyte or a nonelectrolyte:

   Pure water:          ________________      Drain cleaner: _______________

   Ethanol:               ________________      Sucrose:         _______________

   Sodium chloride: ________________

(b) (2 pts.) Explain your answers to (a) above detail according to what you witnessed in this lab demonstration. What is the evidence for each? How did you arrive at your answers? What does the type of chemical bond have to do with this? Be specific.

Answer:

(c) (3 pts.) If you have ever been to a public pool, you know that you are required to exit the pool when there is lightning in the sky. But consider your results from part (a) above and what you learned in this lab, paying particular attention to the very first demonstration that the instructor shows you regarding the light bulb. Does this protocol make sense in light of the data from this demonstration, or is it contradictory? Why or why not? We are talking about water, here, right? Is there anything else going on in this case, chemically speaking, that would change the way we look at this situation?

Answer:
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Replies
wrote...
#1
12 years ago
Taking this lab now and need help on the last question...HELLLLLPPPP

(c) (3 pts.) If you have ever been to a public pool, you know that you are required to exit the pool when there is lightning in the sky. But consider your results from part (a) above and what you learned in this lab, paying particular attention to the very first demonstration that the instructor shows you regarding the light bulb. Does this protocol make sense in light of the data from this demonstration, or is it contradictory? Why or why not? We are talking about water, here, right? Is there anything else going on in this case, chemically speaking, that would change the way we look at this situation?

Answer:
wrote...
#2
12 years ago
If the pool were a salt water pool, it would conduct electricity. Since you looked at NaCl, which is salt, and it dissolves in water and conducts electricity, a salt water pool would conduct electricity from lighening, like the lightbulb, so this "protocol" does make sense. Also a pool would likely have been filled with tap water not deionized water, so it would have ions in it as well.

That's my guess.
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