Topic Selection - Group Assignment # 3

What is MRI? How does it work (5 sentences max)? And how much does it cost each time?

Answer in a detailed paragraph

The methodology of choice for measuring therapeutic drug levels is   Question 4 options:   immunoassay   chromatography   atomic absorption spectrophotometry   spectrophotometry

concentration of unknown yellow dye (uM)

28.9 nm to μm. could I get a step by step, please?

1) Which technique would be best to determine the amount of nitrate in drinking water? Select one. a) Electrophoresis b) UV Spectroscopy c) Reverse osmosis d) Ion Chromatography e) Atomic Absorption 2) Which technique would be best to quantitatively determine the concentration of a substance that absorbs light in the visible range? a) HPLC b) Spectroscopy c) PCR d) Ion chromatography e) Ultracentrifugation

analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio)   1 4.47 69.58 How to get the concentration of the mixture in this case?

1) Which of the diet sodas have the highest concentration of caffeine? Which standard best reflects this concentration?

PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.

Shown here is a Lewis structure for the chlorate ion, CIO3 , that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s). What is the formal charge on CI? :ö: Multiple Choice -1 +1 None of the above

Given the following chromatogram of opiates found in urine, determine the separation resolution between morphine and fentanyl, and decide if the two peaks are resolved. Intensity (AU) 2.5 2.0 1.5 1.0 0.5 (TTTTTTT 1. Hydrocodone 2. Codeine 3. Oxycodone 4. Hydromorphone Morphine 6 Fentanyl 5. 1 ili 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Time (min) ليد O 2.0; not resolved 2.0; resolved O 1.0; not resolved O 1.0; resolved

q41 IF YOU DO NOT KNOW THE ANSWER PLEASE DO NOT REJECT IT please calculate the unknown concentration of the protein D wih an absorbance value of A412 given the standard curve indicated in the table. write your answers in numbers only with 2 decimals. protein concentration (ug/ml) absorbance 0 0.000 0.02 0.161 0.04 0.284 0.06 0.438 0.08 0.572 0.10 0.762

10 Wavelength, 1. (nm) E (Red, µ.Mcm- ɛ(Yellow, µMr'cm¬1) Absorbance 500 0.0369 0.000549 0.405 430 0.00506 0.0167 0.474 An orange colored solution is prepared by mixing a red dye solution with a yellow dye solution and the absorbance was measured at the analytical wavelengths of 430 nm and 500 nm. The table provides the molar absorptivity for the red and yellow dye at each analytical wavelength. Calculate the concentration (in u.M) of the red and yellow dye in the mixture. [red] = [yellow] =

What can labs do to reduce error in GC- ms??

Calculate the concentration of unknown red dye solution

How does ammonia, dimethylglyoxime (DMG), and 8-hydroxyquinoline (8HQ) interact with your cations, leading to the evolution of colored species?   Context: Paper chromatography experiment (separation of inorganic cations) with a 9:1 acetone/ HCl solvent

Which of the five dyes tested in this experiment has the strongest ability to absorb light? How do you know?

Provide an appropriate response. 12) The IQ scores of adults are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that a randomly selected adult has an IQ score between 85 and 125.