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chem 330 > exam 3 > Flashcards

exam 3 Flashcards

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1
Q

MS

A

mass spectrometry

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2
Q

GC

A

gas chromatography

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3
Q

HPLC

A

high performance liquid chromatography

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4
Q

TIC

A

total ion current

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5
Q

SIC

A

select ion current

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6
Q

WCOT

A

wall-coated open tubular

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7
Q

HETP

A

height equal to theoretical plate

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8
Q

FID

A

flame ionization detector

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9
Q

TCD

A

thermal conductivity detector

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10
Q

ECD

A

electron capture detector

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11
Q

ion exchange

A

analytes are electrostatically attached to permanently charged groups bonded to a resin head

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12
Q

analytes are electrostatically attached to permanently charged groups bonded to a resin head

A

ion exchange

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13
Q

adsorption

A

analytes stick to the surface of a solid stationary phase

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14
Q

analytes stick to the surface of a solid stationary phase

A

adsorption

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15
Q

partition

A

analytes dissolve in a liquid stationary phase or in a liquid bonded to or coated on a solid stationary phase

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16
Q

analytes dissolve in a liquid stationary phase or in a liquid bonded to or coated on a solid stationary phase

A

partition

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17
Q

gel exclusion

A

analytes are separated by size/shape

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18
Q

analytes are separated by size/shape

A

gel exclusion

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19
Q

affinity

A

analytes adhere to groups attached to the stationary phase via very specific molecular mechanisms

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20
Q

analytes adhere to groups attached to the stationary phase via very specific molecular mechanisms

A

affinity

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21
Q

Van Deemter equation: A

A

A = multiple path lengths (unaffected by U)

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22
Q

Van Deemter equation: B

A

B = longitudinal diffusion, constant rate (minimizes with increase in flow)

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23
Q

Van Deemter equation: C

A

C = finite mass transfer rate, equilibration time (minimizes with decrease in flow)

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24
Q

Who discovered chromatography?

A

Tswett

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25
In order to analyze a sample by GC, what properties must the analytes possess?
boiling point less than 350 C | thermally stable up to 350 C
26
HPLC columns have lengths in which range?
5 to 30 cm
27
Open tubular GC columns typically have lengths in which range?
30 to 100 m
28
Which of the following detectors is most commonly used for HPLC?
UV
29
Which of the following detectors is considered a universal detector for GC?
TCD
30
Which detector would be best for the trace analysis of halogenated pesticides by GC?
ECD
31
What are advantages of an MS detector in GC or HPLC?
responds to all analytes mass spectrum is strong proof of identity TIC is proportional to concentration
32
In size-exclusion chromatography when would a high molecular weight protein elite relative to a small molecular weight molecule?
earlier in the chromatogram
33
Which is the best choice for mobile phase GC?
He
34
octanoic, benzoic, and 1-aminooctane separated in reverse phase HPLC. which elutes first?
1-aminooctane
35
nonpolar, reverse phase, separated with 65% methanol in water 90% methanol in water?
molecules would elute faster
36
polar, normal phase, 40% 2-propanol in MTBE | 60% 2-propanol in MTBE?
molecules would elute faster
37
AES
atomic emissions spectroscopy
38
UV
ultra-violet
39
A
absorbance
40
IR
infrared
41
ICP
inductively-coupled plasma
42
T
transmittance
43
lambda
wavelength
44
weird V
frequency
45
weird E
molar absorptivity
46
PDA
photo diode array
47
molar spectra are called
bands
48
atomic spectra are called
lines
49
doubling the frequency does what to energy?
doubles the energy
50
doubling the wavelength does what to the energy?
halves the energy
51
tripling the wave number will do what to the energy?
triples the energy
52
absorption spectrums plots consist of
absorbance, wavelength, and molar absorptivity
53
which radiation is highest in energy?
ultra-violet
54
which radiation has the longest wavelength?
microwaves
55
when an atom/molecule absorbs visible light, what transition does the electron undergo?
electronic
56
when an atom/molecule absorbs infrared light, what transition does it undergo?
rotational-vibrational
57
Beer's Law requires
monochromatic light dilute solutions (<0.01 M) steady temperature
58
standard source of UV light
deuterium lamp
59
hollow cathode lamp
frequency tuner for sources of light (lasers) provide characteristic wavelengths provide band of wavelengths more narrow than absorption bands
60
globar
thermal light source for IR spectroscopy
61
best precision for absorbance readings?
0.3 - 2.0
62
when a molecule absorbs a photon
the energy is released as heat
63
what is true of fluorescence?
fast with lifetimes of 10-8 to 10-4 sec | typically from rigid molecules
64
what is true of phosphorescence?
slower with lifetimes of 10-4 to 10+2 sec typically from rigid molecules (solids) triplet to singlet transition
65
what technique has the lowest detection limit?
fluorescence
66
intersystem crossing is
an electron moving from a singlet excited state to a triplet excited state
67
what is true about atomic spectroscopy?
form of elemental analysis most useful for metals analytes are in the gas phase
68
Which technique is most sensitive to variations in flame/plasma temps?
flame AES
69
typical plasma temp range for ICP
6,000 to 10,000 K
70
advantages of ICP over flame AAS an AES
lower detection limits | broader linear range
71
advantages of ICP MS over ICP AES
lower detection range | broader linear range

chem 330 (1 decks)

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