ACS Instrumental Analysis Questions and Answers (100% Correct Answers) Already Graded A+

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ACS Instrumental Analysis Questions and
Answers (100% Correct Answers) Already
Graded A+


UV-Vis Source (Mono or Poly)— [ Ans: ] W-Halogen lamp; D2 or
H2Lamp; Xenon Lamp:(poly)
IR Source (Mono or Poly)— [ Ans: ] Nernst Glower; Globular;
Incandescent: (Poly)
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Laser(Mono)
AA Source (mono or Poly)— [ Ans: ] HCl(mono)
AE Source (Mono or Poly)— [ Ans: ] Plasma Falme(poly)
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Raman Source (mono or Poly)— [ Ans: ] He/Ne Laser;Ar
Laser;Yag Laser:(mono)
UV-Vis Sample Holder— [ Ans: ] Quartz, Glass, Plastic Cuvettes
IR Sample Holder— [ Ans: ] salt plat; gas chamber
AA Sample Holder— [ Ans: ] Graphite Tube; Flame
AE Sample Holder— [ Ans: ] inductively coupled plasma (ICP)
Raman Sample Holder— [ Ans: ] Cuvette
UV-Vis Wavelength Selector— [ Ans: ] Grating, Prism, Filter
IR Wavelength Selector— [ Ans: ] Interferometer;
monochromator
AA Wavelength Selector— [ Ans: ] Monochrom. w/ grating
AE Wavelength Selector— [ Ans: ] Monochrom.
Raman Wavelength Selector— [ Ans: ] Monochrom. w/ grating;
Infermom. w/ laser
UV-Vis Detector— [ Ans: ] Photomultiplier Tube(PMT); Photodiode
Array

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IR Detector— [ Ans: ] Thermal(dispersion); pyroelectric;
photoconducting
AA Detector— [ Ans: ] PMT
AE Detector— [ Ans: ] PMT; Photodiode Array
Raman Detector— [ Ans: ] PMT
HPLC Mobile Phase— [ Ans: ] Rev Phase: Polar Solvent
Norm. Phase: Nonpolar Solvent
GC Mobile Phase— [ Ans: ] He Gas
HPLC Column Length— [ Ans: ] 10-30 cm
GC Column length— [ Ans: ] 30-50 m
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HPLC Modes of Operation— [ Ans: ] 1. Isocratic
2. Gradient
GC Modes of Operation— [ Ans: ] 1.Isothermal
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2. Temp program
HPLC Injection System and Amount— [ Ans: ] Loop System (10uL)
GC Injection Syst. and Amount— [ Ans: ] Syringe (3-5uL)
HPLC Sationary Phase— [ Ans: ] NP=Polar
RP=Nonpolar
HPLC Detector— [ Ans: ] Z cell (UV)
GC Detector— [ Ans: ] FID (flame ionization detector)
HPLC Pump— [ Ans: ] Reciprocating
Displacement
HPLC Chromotography— [ Ans: ] 1. Partition
2. Adsorption
3. Ion Exchange
4. Size Exclusion
5. Affinity

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what are the difference between calibration sensitivity and
analytical sensitivity— [ Ans: ] calibration sensitivity is the slope of
a calibration curve at the concentration of interest while
analytical sensitivity is a response to the noise ratio
how to calculate calibration sensitivity— [ Ans: ] y=mx+b (m is
the calibration sensitivity)
graph concentration vs mean analytical signal
how to find the analytical sensitivity— [ Ans: ] As (concentation)
= calibration sensitivity/SD [ ]
how to find the coefficient of variation for the mean of each of
the replicate sets— [ Ans: ] CV = SD/Average x 100
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how to find the detection limit for method?— [ Ans: ]
3.3*SD(blank)/calibration sensitivity
voltage in a series— [ Ans: ] Vt = Vc + Vb + Va
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Voltage in a parallel circuit— [ Ans: ] 1/Veff = 1/Va + 1/Vb
Capacitance in a series— [ Ans: ] 1/Ceff = 1/Ca + 1/Cb
capacitance equals— [ Ans: ] Q/V
if a spectrum is the result of a single scan while another is the result
of multiple scans, how man individual spectra were summed to
increase S/N from 4.2 to 43?
a) formula?
b) answer— [ Ans: ] a) (S/N)a = sqrt(n) (S/N)b
b) 105
what type of noise can be reduced by decreasing the
temperature of a measurement— [ Ans: ] thermal noise
what type of noise can be reduced by decreasing the frequency
used for the measurement— [ Ans: ] flicker noise
what type of noise can be reduced by decreasing the bandwidth
of the measurement— [ Ans: ] environmental noise