1
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Instrumental Analysis Questions and
Answers (100% Correct Answers) Already
Graded A+
Data Domains [ Ans: ] The various modes of encoding
information
Signal [ Ans: ] contains the desired information about the
analyte; "the stuff we want to know"
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Noise [ Ans: ] the extraneous information we do not want
Noise [ Ans: ] Is always present and can never be completely
eliminated
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Noise [ Ans: ] The effect of noise on a measurement becomes
larger as the analyte response decreases in magnitude
Chemical Noise [ Ans: ] uncontrollable variables that affect the
chemistry of the system being analyzed. (Temperature, pressure,
humidity, light intensity, fumes)
Instrumental Noise [ Ans: ] a complex composite of noises that
arise from the various electronic components of an instrument.
Thermal Noise [ Ans: ] caused by random thermal fluctuations
which agitate the movement of the charge carriers (or electrons)
within the electronic circuits=random current fluctuations which
eventually get digitized by ADC.
Environmental Noise [ Ans: ] Composite of different forms of
noise that arise from the surrounding...(not including Thermal
noise)
Environmental Noise [ Ans: ] Instruments are also susceptible to
vibrations which can cause components to vibrate, causing
detected signals to fluctuate which get digitized.
, 2
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S/N Enhancement [ Ans: ] As the need for sensitivity and
precision of an instrumental method increases, S/N becomes the
limiting factor in the quality of a measurement.
Hardware [ Ans: ] Mechanical components; remove noise
without affecting the signal too much.
Software [ Ans: ] computer algorithms that extract signals from
noisy data.
Hardware devices [ Ans: ] common sense, grounding and
shielding, analog filtering (most common methods for improving
S/N), Modulation
Modulation-Chopper [ Ans: ] converts low frequency signal to
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high frequency signal.
Modulation- Chopper [ Ans: ] low frequency noise; low
frequency signal
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Ensemble Averaging [ Ans: ] Taking measurements multiple time
and then averaging them to reduce noise; taking multiple
spectrum and averaging to produce one spectrum
Ensemble Averaging [ Ans: ] S/N varies from point to point
because noise stays the same but signal varies.
Unweighted moving average [ Ans: ] a "window" (or bracket) of
chosen size is moved across a raw signal. The data points that fall
within the window are averaged and replaced with a single mean
value.
Qualitative analysis [ Ans: ] information about identity
Quantitative analysis [ Ans: ] information about amount
Classical method [ Ans: ] use of chemical solvents and glassware
Classical method [ Ans: ] does not use electricity
Instrumental methods [ Ans: ] use electricity and help determine
different properties that the classical method cannot determine.
Classical vs. Instrumental methods [ Ans: ] analysis properties
determined in the instrumental differ from those determined in the
classical methods.
For Expert help and assignment solutions, +254707240657
Instrumental Analysis Questions and
Answers (100% Correct Answers) Already
Graded A+
Data Domains [ Ans: ] The various modes of encoding
information
Signal [ Ans: ] contains the desired information about the
analyte; "the stuff we want to know"
© 2025 Assignment Expert
Noise [ Ans: ] the extraneous information we do not want
Noise [ Ans: ] Is always present and can never be completely
eliminated
Guru01 - Stuvia
Noise [ Ans: ] The effect of noise on a measurement becomes
larger as the analyte response decreases in magnitude
Chemical Noise [ Ans: ] uncontrollable variables that affect the
chemistry of the system being analyzed. (Temperature, pressure,
humidity, light intensity, fumes)
Instrumental Noise [ Ans: ] a complex composite of noises that
arise from the various electronic components of an instrument.
Thermal Noise [ Ans: ] caused by random thermal fluctuations
which agitate the movement of the charge carriers (or electrons)
within the electronic circuits=random current fluctuations which
eventually get digitized by ADC.
Environmental Noise [ Ans: ] Composite of different forms of
noise that arise from the surrounding...(not including Thermal
noise)
Environmental Noise [ Ans: ] Instruments are also susceptible to
vibrations which can cause components to vibrate, causing
detected signals to fluctuate which get digitized.
, 2
For Expert help and assignment solutions, +254707240657
S/N Enhancement [ Ans: ] As the need for sensitivity and
precision of an instrumental method increases, S/N becomes the
limiting factor in the quality of a measurement.
Hardware [ Ans: ] Mechanical components; remove noise
without affecting the signal too much.
Software [ Ans: ] computer algorithms that extract signals from
noisy data.
Hardware devices [ Ans: ] common sense, grounding and
shielding, analog filtering (most common methods for improving
S/N), Modulation
Modulation-Chopper [ Ans: ] converts low frequency signal to
© 2025 Assignment Expert
high frequency signal.
Modulation- Chopper [ Ans: ] low frequency noise; low
frequency signal
Guru01 - Stuvia
Ensemble Averaging [ Ans: ] Taking measurements multiple time
and then averaging them to reduce noise; taking multiple
spectrum and averaging to produce one spectrum
Ensemble Averaging [ Ans: ] S/N varies from point to point
because noise stays the same but signal varies.
Unweighted moving average [ Ans: ] a "window" (or bracket) of
chosen size is moved across a raw signal. The data points that fall
within the window are averaged and replaced with a single mean
value.
Qualitative analysis [ Ans: ] information about identity
Quantitative analysis [ Ans: ] information about amount
Classical method [ Ans: ] use of chemical solvents and glassware
Classical method [ Ans: ] does not use electricity
Instrumental methods [ Ans: ] use electricity and help determine
different properties that the classical method cannot determine.
Classical vs. Instrumental methods [ Ans: ] analysis properties
determined in the instrumental differ from those determined in the
classical methods.
