CHEM 310 - Final Exam Study Guide || with Errorless Solutions 100%.
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Course
CHEM 310
Institution
CHEM 310
What are the advantages of a furnace compared
with a flame in atomic absorption spectroscopy? correct answers 1. More sensitive
2. Requires less sample
What are the disadvantages of a furnace compared
with a flame in atomic absorption spectroscopy? correct answers Reproducibility is poor with...
CHEM 310 - Final Exam Study Guide || with Errorless
Solutions 100%.
What are the advantages of a furnace compared
with a flame in atomic absorption spectroscopy? correct answers 1. More sensitive
2. Requires less sample
What are the disadvantages of a furnace compared
with a flame in atomic absorption spectroscopy? correct answers Reproducibility is poor with a
manual sample introduction
What are the three steps of a temperature profile? correct answers 1. Drying
2. Charring
3. Atomization
What is the purpose of drying in the heat profile? correct answers To remove solvent from a
sample
What is the purpose of charring in the heat profile? correct answers To remove as much matrix
as possible without disturbing the analyte
What is the purpose of atomization in the heat profile? correct answers To vaporize the analyte
for absorption measurement
What are the advantages of the inductively coupled plasma compare to the flame in atomic
spectroscopy? correct answers 1. Less Chemical Interference
2. Higher and more uniform temperature
3. No combustion gases
4. No lamp required
What are the disadvantages of the inductively coupled plasma compare to the flame in atomic
spectroscopy? correct answers More expensive
What is spectral interference? correct answers 1. Overlap of analyte signals due to signals from
other elements or molecules
What is chemical interference and what is an example? correct answers 1. When chemical
reactions decrease the concentration of analyte atoms
2. SO4(2-) and PO4(3-) hinder atomization of Ca(2+)
What is ionization interference? correct answers 1. Loss of analyte atoms due to ionization
What is isobaric interference and what is an example? correct answers 1. Overlap of species with
similar mass-to-charge ratios.
, How are ions created from Electron Impact Ionization? correct answers M+.
How are ions created from Chemical Ionization? correct answers MH+
What are some spectral differences between Chemical and Electron Impact Ionization? correct
answers 1. EI has more fragmentation
2. CI has MH+ (proton), EI has M+.
How do you predict the relative amount of a chemical with 2 molecules of abundance 'a'? correct
answers a^2
How do you predict the relative amount of a chemical with 2 molecules of abundance 'b'? correct
answers b^2
How do you predict the relative amount of a chemical with 2 total molecules of abundance 'a'
and 'b'? correct answers 2ab
How do you calculate the number of rings and double bonds? correct answers R+DB = c - h/2 +
n/2 + 1
What is a reconstructed total ion chromatograph? correct answers shows the signal from all ions
above a chosen m/z emerging from chromatography as a function of time
What is an extracted ion chromatograph? correct answers shows the signal for one or a few ions
taken from the complete mass spectrum
What is a selected ion chromatograph? correct answers shows the signal for one or a few ions but
is only measuring a desired m/z value
What are some differences between MALDI and Electrospray Ionization? correct answers 1.
Electrospray involves using heat
2. Electrospray uses coulombic explosions to separate analyte
3. MALDI requires a laser for vaporization of matrix
4. MALDI requires proton donation to the sample
How does selected ion monitoring work? correct answers Mass spectrometer is set to monitor
just a few values of m/z to create a selected ion chromatograph with reduced noise signal
Is it better to do less extraction with more volume or more extractions with less volume and
why? correct answers More extractions less volume because it gives a smaller fraction remaining
Is it more effective to adjust the aqueous phase of an acid to an acidic pH or basic pH and why?
correct answers Acidic pH because it is an acid and we want it to be in its neutral state rather
than anionic state
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