CHEM 210 TEST MODULE 3
EXAM NEWEST QUESTIONS
AND ANSWERS (2023 / 2024)
(VERIFIED ANSWERS)
Where Beer's Law Fails<
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?<
wavelength change
Equation for Linear Vibration Modes<
ICP-AE Disadvantages<
2. More expensive to purchase AND operate
ICP-AE Advantages<
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?<
Types of Absorption<
2. Rotational Transitions
3. Vibrational Transitions
Rotation Wavelength<
Vibration wavelength<
Electronic Wavelength<
LASER Acronym<
Problems with Flame Atomic Absorption<
2. Spectral Interference
3. Chemical Interference
4. Ionization Interference
How do we account for background absorbance?<
How do we account for spectral interference<
(closely-spaced lines are often removed by a spectrometer)
How do we account for chemical interference<
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<
substance which ionizes easy (i.e. an alkali metal
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