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Analytical Chemistry Final- ACS Exam 2024
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Analytical Chemistry Final- ACS Exam 2024

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  • May 9, 2024
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  • 2023/2024
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  • analytical chemistry final acs exam 2024

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Analytical Chemistry Final - ACS Exam 202 4 Extraction The physical Transfer of solute from one phase to another Partitioning Grating optical element with closely spaced lines diffraction propagation of light by a slit The bending of light rays by a grating polychromatic multiple wavelengths monochromatic one wavelength Which process usually occurs first after a molecule absorbs a photon? A. phosphorescence B. intersystem crossing C. fluorescence D. Vibrational relaxation D. A solute is to be extracted using 150 mL of solvent. Of the options below, which will extract the maximum amount of solute? A) extract with 30 mL five times B) extract with 37.5 mL four times C) extract with 75 mL twice D) extract once with the entire volume E) extract with 50 mL three time A After a molecule absorbs a photon, several processes can occur. What is the correct order (first to last) of processes that occur for molecules that fluoresce? A) Absorbance, internal conversion, fluorescence B) Absorbance, intersystem crossing, fluorescence C) Absorbance, vibrational relaxation, intersystem crossing, fluorescence D) Absorbance, vibrational relaxation, fluorescence D adsorption chromatography partition chromatography solute equilibrates between the stationary liquid and the mobile phase ion-exchange chromatography solute ions of the opposite charge are attracted to the stationary phase molecular exclusion chromatography solute is separated based on size Consider a reversed phase chromatographic separation of solutes A and B, where tm is the mobile phase retention time, tA and tB are the retention times of the solutes A and B, wA and wB are the baseline widths of peak A and peak B, wavg is the average of the two baseline widths, and kA and kB are the retention factors for solutes A and B. Which of the following is a measure of kA? A. (tA -tm)/wA B. (tA -wA)/tm C. tA/tm D. tA -tm E. (tA -tm)/tm F. tA/wA E. Consider a reversed phase chromatographic separation of solutes A and B, where tm is the mobile phase retention time, tA and tB are the retention times of the solutes A and B, wA and wB are the baseline widths of peak A and peak B, wavg is the average of the two baseline widths, and kA and kB are the retention factors for solutes A and B. Which of the following is a measure of the resolution of A and B? A. (tB -tm)/(tA -tm) B. (tB -tA)/wavg C. tB -tA D. tB/tA E. ( tB -tA)/tm F. (tA/wA) -(tB/wB B. Consider a reversed phase chromatographic separation of solutes A and B, where tm is the mobile phase retention time, tA and tB are the retention times of the solutes A and B, wA and wB are the baseline widths of peak A and peak B, wavg is the average of the two baseline widths, and kA and kB are the retention factors for solutes A and B. How might tm be determined? A. from stationary phase particle size B. from average of baseline peak widths C. from first disturbance of baseline C. Photocell phototube photodiode commonly micro fabricated into arrays of 500 or more individual detectors photomultiplier tube Isocratic elution elution with a constant composition mobile phase gradient elution packed column

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