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[fifteen] A student ran a TLC plate using 60:40 water:ethanol developer and these were their computed Rf values:
Pigment |
Retention Factor |
Compund A |
0.55 |
Compund B |
0.32 |
Compund C |
0.89 |
What can you conclude about the polarities of the different components based solely on this result?
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- A chemistry student at GGC synthesized a new sulfonamide (S7) drug to help treat malaria. Using a spectrophotometer the student observed that S7 converts to a colorless molecule in the presence of malaria parasite called Plasmodium falciparum. To study the rate of reaction, the student recorded the absorbance/amount of S7 at a wavelength of 570 nm. The results are summarized in the table below: Time (s) Absorbance/Amount of S7 0.80 0.63 10 0.50 15 0.40 20 О.32 25 0.25 30 0.20 Determine the half-life of S7. Include units in your answer MacBook Air 000 000 F8 80 F7A flat (not spherical) tissue engineered skin (thickness 2.5 mm) is attached to the bottom of a dish and cultured with cell media atop it (which has an oxygen concentration of 0.15 mol/m3). The diffusivity of oxygen in the skin is 3.4 E-9 m2/s, and according to experiments that you’ve performed, you want to make sure that the concentration of oxygen in the device doesn’t fall below 0.06 mol/m3. (Below that concentration harms the cells.) The rate of oxygen consumption is -5.9 E-17 mol/[cell◦s]. What is the maximum cellularity (in cells/mL, three significant digits) that this tissue engineered skin can support?The standard curve provided below will allow you to answer the remaining questions. Generic Standard Curve 0.7 y = 0.9425x- 0.0034 0.6 0.5 0.4 0.3 02 0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Concentration (mg/ml) - Please describe two ways in which you could use this standard curve to determine the concentration of a pigment in an unknown sample.| #1: #2: -What is your rough estimation of the concentration if you determine the absorbance of a sample is 0.150? Absorbance