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Lesson 4 Lab: Chromatography and Ionic versus Covalent Bonds


Begin by viewing the following Thinkwell video

(a) (3 pts.) This video discusses 3 different types of chromatography. List each one mentioned, and describe their differences in as much detail as possible (your points earned will be proportional to the level of detail in your discussion). Which one was used in this lab demonstration?

(b) (2 pts.) How did chromatography get its name, and how is it used differently now compared to in the past (according to the video)? Give an example. What is chromatography, and how exactly does it work?

(c) Suppose I melted a grape (purple) popsicle and ran a chromatogram of the resulting substrate.

(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? You must be specific to receive credit.


Please watch the following Thinkwell video:

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

(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.

(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?

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