CHEM 2001 EXAM 4 Spring 2026
NAME: E-mail: EXAM GRADE:
1. Fill in the blanks with an appropriate answer about atomic spectroscopy. (9 points)
qFES
e In atomic emission spectroscopy, atoms are excited by__ PLASHA
e |In atomic absorption spectroscopy, molecules are broken into free atoms by FLAlte
[ grodue Eormncd
ElTuen bl Y P€
e Fine mist of dry molecules is generated by __pequc(zen BPES
2. In a toxicology lab, Mary has an assignment to investigate possible arsenic contamination in a
blood sample from a patient. She sets out to use the Atomic Absorption Spectrometer (AAS)
instrument.
A. Arsenic has an absorption line at 228.812 nm. Why do atoms have line spectra? (4 points)
ELeCfflO =l C S (ATEQ ("AUé =6 V(MAT(OPQL/{LO’( rTlomBL ngT‘;) SO THAC L(
/
A TRAESTIOY g CopRE-PS TG A Slecific ErEncy D(FFERECE (E-L-L:;)
B. There are two types of AAS instruments available in this toxicology lab, graphite furnace
and flame AAS. The blood sample is not more than 100 pL. Which instrument should the
technician use to analyze the sample? Why? (4 points)
C'((N’HH'(:' ForAale ATonuc Afigofl\"(lov Srf{n@onéfe‘& tl
IT (P~ BE OPELETED verl 07’ PECOSITIRG A S1plc VoiLon& ((o— (00A (.J oF
PeECy e Jo(wttor o= TRE (RoPANTE FurRPACE t1
C. Mary realized the sample might also contain cadmium which has an absorption line at
228.802 nm. What kind of problem might she have? What could be the solution for it? (4
points)
SCECTRAL jTelhFepeme
CHOBSE proTuEr l
, CHEM 2001 EXAM 4 Spring 2026
3. Which of following is not true about hollow cathode lamp? (3 points)
N
/
A. The cathode is made from the metal of interest.
The lamp is filled with air.
C. The light emitted by the lamp is the emission line of the metal of interest.
D. Applied voltage ionizes gas atoms which then sputter metals from the cathode.
E. The atomic line widths of the light are around 0.002 nm.
"/ 4. The purity of a common painkiller, acetaminophen, CsHsNO, can be determined by measuring
\ the absorbance of an aqueous solution of the drug at 244 nm and comparing it to a solution of
acetaminophen of known purity and concentration. Select appropriate instrument and
instrument parts for such analysis. (12 points)
e The instrument suitable for this analysis is: _ABSoggtior (UV’VU) specTropHotonteTeEn 3¢€ S
e The lamp used for this measurementis: _DecteRivit ot ¥ewow 3pE §
o The sample holderis: Covetié 3ee(
e The sample holder material is: Qosers 3PE)
5. Which of the detectors below can measure multiple wavelengths simultaneously? (5 points)
J
A. photo multiplier tube
B. photodiode
@ photodiode array
D. reflection grating
E. grating polychromator
NAME: E-mail: EXAM GRADE:
1. Fill in the blanks with an appropriate answer about atomic spectroscopy. (9 points)
qFES
e In atomic emission spectroscopy, atoms are excited by__ PLASHA
e |In atomic absorption spectroscopy, molecules are broken into free atoms by FLAlte
[ grodue Eormncd
ElTuen bl Y P€
e Fine mist of dry molecules is generated by __pequc(zen BPES
2. In a toxicology lab, Mary has an assignment to investigate possible arsenic contamination in a
blood sample from a patient. She sets out to use the Atomic Absorption Spectrometer (AAS)
instrument.
A. Arsenic has an absorption line at 228.812 nm. Why do atoms have line spectra? (4 points)
ELeCfflO =l C S (ATEQ ("AUé =6 V(MAT(OPQL/{LO’( rTlomBL ngT‘;) SO THAC L(
/
A TRAESTIOY g CopRE-PS TG A Slecific ErEncy D(FFERECE (E-L-L:;)
B. There are two types of AAS instruments available in this toxicology lab, graphite furnace
and flame AAS. The blood sample is not more than 100 pL. Which instrument should the
technician use to analyze the sample? Why? (4 points)
C'((N’HH'(:' ForAale ATonuc Afigofl\"(lov Srf{n@onéfe‘& tl
IT (P~ BE OPELETED verl 07’ PECOSITIRG A S1plc VoiLon& ((o— (00A (.J oF
PeECy e Jo(wttor o= TRE (RoPANTE FurRPACE t1
C. Mary realized the sample might also contain cadmium which has an absorption line at
228.802 nm. What kind of problem might she have? What could be the solution for it? (4
points)
SCECTRAL jTelhFepeme
CHOBSE proTuEr l
, CHEM 2001 EXAM 4 Spring 2026
3. Which of following is not true about hollow cathode lamp? (3 points)
N
/
A. The cathode is made from the metal of interest.
The lamp is filled with air.
C. The light emitted by the lamp is the emission line of the metal of interest.
D. Applied voltage ionizes gas atoms which then sputter metals from the cathode.
E. The atomic line widths of the light are around 0.002 nm.
"/ 4. The purity of a common painkiller, acetaminophen, CsHsNO, can be determined by measuring
\ the absorbance of an aqueous solution of the drug at 244 nm and comparing it to a solution of
acetaminophen of known purity and concentration. Select appropriate instrument and
instrument parts for such analysis. (12 points)
e The instrument suitable for this analysis is: _ABSoggtior (UV’VU) specTropHotonteTeEn 3¢€ S
e The lamp used for this measurementis: _DecteRivit ot ¥ewow 3pE §
o The sample holderis: Covetié 3ee(
e The sample holder material is: Qosers 3PE)
5. Which of the detectors below can measure multiple wavelengths simultaneously? (5 points)
J
A. photo multiplier tube
B. photodiode
@ photodiode array
D. reflection grating
E. grating polychromator
