INSTRUMENTAL ANALYSIS ACS FINAL TEST
PAPER 2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS ALREADY PASSED
●● how to calculate calibration sensitivity.
Answer: y=mx+b (m is the calibration sensitivity)
graph concentration vs mean analytical signal
●● how to find the analytical sensitivity.
Answer: As (concentation) = calibration sensitivity/SD [ ]
●● how to find the coefficient of variation for the mean of each of the
replicate sets.
Answer: CV = SD/Average x 100
●● how to find the detection limit for method?.
Answer: 3.3*SD(blank)/calibration sensitivity
●● voltage in a series.
Answer: Vt = Vc + Vb + Va
●● Voltage in a parallel circuit.
,Answer: 1/Veff = 1/Va + 1/Vb
●● Capacitance in a series.
Answer: 1/Ceff = 1/Ca + 1/Cb
●● capacitance equals.
Answer: 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.
Answer: 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.
Answer: thermal noise
●● what type of noise can be reduced by decreasing the frequency used
for the measurement.
Answer: flicker noise
, ●● what type of noise can be reduced by decreasing the bandwidth of
the measurement.
Answer: environmental noise
●● What would be an appropriate source and detector to determine the
emission lines for lithium from 200 to 780 nm?.
Answer: flame and photo multiplier tube (PMT)
●● you've been asked to measure the UV absorbance of a sample
containing poly cyclic aromatic hydrocarbons, a byproduct of the
incomplete combustion of organic matter. What would be an appropriate
material for the sample container?.
Answer: fused silica or quartz
●● which of the following changes will result in a decreased effective
bandwidth?
a) increasing the number of blazes in the monochromatic grating
b) switching from a short-pass filter to a long-pass filter
c) increasing sample concentration
d) decreasing the amount of stray light.
Answer: a
PAPER 2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS ALREADY PASSED
●● how to calculate calibration sensitivity.
Answer: y=mx+b (m is the calibration sensitivity)
graph concentration vs mean analytical signal
●● how to find the analytical sensitivity.
Answer: As (concentation) = calibration sensitivity/SD [ ]
●● how to find the coefficient of variation for the mean of each of the
replicate sets.
Answer: CV = SD/Average x 100
●● how to find the detection limit for method?.
Answer: 3.3*SD(blank)/calibration sensitivity
●● voltage in a series.
Answer: Vt = Vc + Vb + Va
●● Voltage in a parallel circuit.
,Answer: 1/Veff = 1/Va + 1/Vb
●● Capacitance in a series.
Answer: 1/Ceff = 1/Ca + 1/Cb
●● capacitance equals.
Answer: 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.
Answer: 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.
Answer: thermal noise
●● what type of noise can be reduced by decreasing the frequency used
for the measurement.
Answer: flicker noise
, ●● what type of noise can be reduced by decreasing the bandwidth of
the measurement.
Answer: environmental noise
●● What would be an appropriate source and detector to determine the
emission lines for lithium from 200 to 780 nm?.
Answer: flame and photo multiplier tube (PMT)
●● you've been asked to measure the UV absorbance of a sample
containing poly cyclic aromatic hydrocarbons, a byproduct of the
incomplete combustion of organic matter. What would be an appropriate
material for the sample container?.
Answer: fused silica or quartz
●● which of the following changes will result in a decreased effective
bandwidth?
a) increasing the number of blazes in the monochromatic grating
b) switching from a short-pass filter to a long-pass filter
c) increasing sample concentration
d) decreasing the amount of stray light.
Answer: a
