Instrumental Analysis ACS Exam Final questions
with verified answers
(A) Given the following cell, determine the cell potential
SHE 0V
Ag/AgCl +0.199V (vs. SHE)
SCE +0.244V (vs. SHE)
(B) Using the information discovered in A, determine the following.
Working electrode potential is -0.123 V (vs Ag/AgCl)... what is the
potential of SHE? Ans✓✓✓ (A) Ag/AgCl-SCE = 0.045 V
(B) SCE = -0.123 V - 0.045 V = -0.168 V
*True or false* In size exclusion/gel chromatography, the residence
time in the pores does not depend on the size of the analyte. Ans✓✓✓
*False*, size exclusion/gel chromatography residence time in pores
does dependent on the size of the analyte molecules
*True or false* there is no chemical or physical interaction between
analytes and the stationary phase in size exclusion/gel
chromatography. Ans✓✓✓ *True*, there is no chemical or physical
interaction between analytes and stationary phase in size exclusion/gel
chromatography
, *True or false* You can substitute one type of oxidant with another.
For instance, you can substitute oxygen with the flame atomization
settings for air. Ans✓✓✓ *False* You should not substitute one type of
oxidant with another
Be able to use reduction potentials of different species to determine
which one would be oxidized or reduced first/last (Ch 22 ppt) (answer
IDK) Ans✓✓✓ IDK
Compare and contrast atomic absorption and flame atomic emission
spectrometry. Ans✓✓✓ *Similarities* both can be used to analyze
metal ions as metal ions will be converted to atoms in both methods
*Differences*
- In atomic absorption the signal is dependent on the absorption of
atoms at ground state.
- Atomic absorption is more sensitive
- In atomic emission the signal is dependent on the emission of excited
atoms
Compare and contrast fluorescence and phosphorescence Ans✓✓✓
Both...
- occur by UV and visible excitation
with verified answers
(A) Given the following cell, determine the cell potential
SHE 0V
Ag/AgCl +0.199V (vs. SHE)
SCE +0.244V (vs. SHE)
(B) Using the information discovered in A, determine the following.
Working electrode potential is -0.123 V (vs Ag/AgCl)... what is the
potential of SHE? Ans✓✓✓ (A) Ag/AgCl-SCE = 0.045 V
(B) SCE = -0.123 V - 0.045 V = -0.168 V
*True or false* In size exclusion/gel chromatography, the residence
time in the pores does not depend on the size of the analyte. Ans✓✓✓
*False*, size exclusion/gel chromatography residence time in pores
does dependent on the size of the analyte molecules
*True or false* there is no chemical or physical interaction between
analytes and the stationary phase in size exclusion/gel
chromatography. Ans✓✓✓ *True*, there is no chemical or physical
interaction between analytes and stationary phase in size exclusion/gel
chromatography
, *True or false* You can substitute one type of oxidant with another.
For instance, you can substitute oxygen with the flame atomization
settings for air. Ans✓✓✓ *False* You should not substitute one type of
oxidant with another
Be able to use reduction potentials of different species to determine
which one would be oxidized or reduced first/last (Ch 22 ppt) (answer
IDK) Ans✓✓✓ IDK
Compare and contrast atomic absorption and flame atomic emission
spectrometry. Ans✓✓✓ *Similarities* both can be used to analyze
metal ions as metal ions will be converted to atoms in both methods
*Differences*
- In atomic absorption the signal is dependent on the absorption of
atoms at ground state.
- Atomic absorption is more sensitive
- In atomic emission the signal is dependent on the emission of excited
atoms
Compare and contrast fluorescence and phosphorescence Ans✓✓✓
Both...
- occur by UV and visible excitation
