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CHEM 210 TEST MODULE 3 EXAM NEWEST QUESTIONS AND ANSWERS (2023 / 2024) (VERIFIED ANSWERS)

CHEM 210 TEST MODULE 3  EXAM NEWEST QUESTIONS  AND ANSWERS (2023 / 2024)  (VERIFIED ANSWERS)

CHEM 210 TEST MODULE 3
EXAM NEWEST QUESTIONS
AND ANSWERS (2023 / 2024)
(VERIFIED ANSWERS)
Where Beer's Law Fails<>1. If what is measured has equilibrium shifts
2. With high reflection (worse when concentration is high)
3. When path length isn't constant (there are multiples)
4. When the extinction coefficient isn't constant (there is polychromatic light)
5. When Stray light can be reflected
What is the main advantage of double-beam instruments over single-beam
instruments?<>You don't have to calibrate the double-beam instrument for every
wavelength change
Equation for Linear Vibration Modes<>3N-5 (for non-linear, it is 3N-6)
ICP-AE Disadvantages<>1. Ar+ Emission Interference
2. More expensive to purchase AND operate
ICP-AE Advantages<>1. Inert Atmosphere
2. Built-in electron "ionization buffer"
3. High temperature breaks down molecules
4. Rapid multi-element analysis
As energy increases, does wavelength increase or decrease?<>decreases
Types of Absorption<>1. Electronic Transitions
2. Rotational Transitions
3. Vibrational Transitions
Rotation Wavelength<>Microwave
Vibration wavelength<>Infrared
Electronic Wavelength<>UV & Visible
LASER Acronym<>Light Amplification by Stimulated Emission of Radiation
Problems with Flame Atomic Absorption<>1. Background Absorbance
2. Spectral Interference
3. Chemical Interference
4. Ionization Interference
How do we account for background absorbance?<>You measure it and subtract it
How do we account for spectral interference<>Choose a wavelength very carefully
(closely-spaced lines are often removed by a spectrometer)
How do we account for chemical interference<>1. Use a high temperature
2. Use protective and releasing agents
3. Add something which binds even tighter with the interfering substance than the substance being
measured, which frees the substance being measured
4. Add something (such as EDTA) which complexes the substance being measured and prevents it
from binding with the interfering chemical
How do we account for ionization interference<>Add a high concentration of a
substance which ionizes easy (i.e. an alkali metal

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