Instrumental Analysis Final Exam 2025 Questions and Answers 100% Correct
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Course
Instrumental Analysis
Institution
Instrumental Analysis
Instrumental Analysis Final Exam 2025 Questions and Answers 100% CorrectInstrumental Analysis Final Exam 2025 Questions and Answers 100% CorrectInstrumental Analysis Final Exam 2025 Questions and Answers 100% CorrectInstrumental Analysis Final Exam 2025 Questions and Answers 100% CorrectT or F:
H...
Instrumental Analysis Final Exam 2025
Questions and Answers 100% Correct
T or F:
Hyphenated techniques combine chromatographic and spectral methods to exploit
advantages of both, such as GC-MS. Chromatography produces pure or nearly pure
fractions of chemical components in a mixture. Spectroscopy produces selective
information for identification using standards or library spectra - ANSWER-True
T or F: The figure on the right indicates poor accuracy and good precision - ANSWER-
False
T or F: Signal-to-noise ratio is a measure used in science and engineering that
compares the level of a desired signal to the level of background noise. SNR is defined
as the ratio of the noise power to the signal power, often expressed in decibels. -
ANSWER-False
T or F: Small measurement uncertainties are normal during calibration. In order to
determine the actual concentration-absorbance response using Beer's Law, perform a
least-squares fit of the data points - ANSWER-True
T or F: Length (meter), force (Newton), and temperature (Celsius degree) are SI base
units while density and pressure (Pascal) are SI derived units - ANSWER-False
Equation A=abc where A is absorbance, a molar absorptivity, and c concentration. This
equation is known as - ANSWER-Beer's Law
The transition of electrons. It is better to explain as ___ light - ANSWER-Fluorescence
What is the correct reading of the buret? - ANSWER-29.44 mL
A student needs 15.0 g of ethyl alcohol for an experiment. If he/she finds the density (d=
0.789 g/mL, at 20C) on the reagent bottle label, how many milliliters (mL) of the liquid
are needed at 20C? - ANSWER-19.0 mL
As a consequence of Snell's Law, light waves transitioning into a medium of higher
refractive will tend to be - ANSWER-Refracted toward the normal axis
Describe the relationship between wavelength and frequency of light - ANSWER-The
shorter the wavelength the higher the frequency, the wider the wavelength the lower the
frequency
, Small measurement uncertainties are normal during calibration. In order to determine
the actual concentration-absorbance response using Beer's Law, perform a least-
squares fit to the data points. This is - ANSWER-Zero-concentration
T or F: For compound microscopes, although oil immersion lenses can improve the
resolution at high magnification, it significantly increases unwanted numerical aperature
- ANSWER-False
T or F: Because of the unique patterns of absorbing IR wavelengths which are specific
to that particular molecule, the absorption in the fingerprint region is the important
characteristic to identify and to interpret the functional groups such as O-H, N-H, C
double bond O, and C double bond C - ANSWER-True
In the core of the Sun, hydrogen is being converted into helium. The presence of
hydrogen and helium in the Sun was first detected from the earth by scientists using a
knowledge of - ANSWER-Emission spectroscopy
Refers to a defect in a lens design which causes light to spread out instead of focusing
to form a sharp image - ANSWER-Optic Aberration
Images produced by diverging light rays (appearing where the light rays seem to
converge) is referred to as a ___, such as an image from a light microscope -
ANSWER-Virtual image
Snell's Law equation is expressed as - ANSWER-n1sin1=n2sin2
In an GC analysis, a chemist observed two adjacent peaks. Peak A was at 16.8 minutes
and peak B was at 21.4 minutes. The chemist measured the peak width near the
baseline and found peak A was 3.4 minutes and peak B was 3.6 minutes. Calculate the
resolution - ANSWER-1.31
Were the two peaks well separated? - ANSWER-The calculation disclosed that the two
peaks were 1.31. This shows that two peaks were well separated.
Why? - ANSWER-The calculation shows that the two peaks were not on top of each
other
T or F: A flame atomic absorption method can be used to distinguish between calcium
chloride and calcium nitrate - ANSWER-False
T or F: The absorbance peaks for atomic absorption spectroscopy are much wider than
that for molecular spectroscopy, absorbance (y-axis) versus wavelength (x-axis) -
ANSWER-False
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