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What is the principle that allows us to use mass spectrometry to determine the molecular

 What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound? 
A. higher molecular weight compounds are less volatile
B. higher molecular weight compounds are more dense
C. a beam of higher molecular weight cations is deflected less by a magnetic field
D. ions with higher molecular weight absorb higher frequencies of light

 

2. In mass spectrometry, which of the following phrases is shortened to the acronym "FAB"? 
A. flight averaged bumping
B. fast atom bombardment
C. fragmented atom beam
D. flying atom bashing

 

3. In mass spectrometry, which of the following phrases is shortened to the acronym "EI"? 
A. electron injection
B. electron impact
C. energy initiated
D. energy insertion

 

4. In mass spectrometry, which of the following phrases is shortened to the acronym "MALDI"? 
A. mass analysis by light-detected ions
B. matrix assisted laser desorption ionization
C. many atom loss-detecting ionization
D. molecular and light detecting instrument

 

5. What is the x-axis of a mass spectrum? 
A. mass
B. mass/energy
C. mass/charge
D. charge

 

6. What is the y-axis of a mass spectrum? 
A. mass
B. energy
C. abundance
D. field strength

 

7. Which of the following is the definition of the base peak of a mass spectrum? 
A. the peak corresponding to the most abundant ion
B. the peak corresponding to the ion with lowest m/e
C. the peak corresponding to the molecular ion peak
D. the peak corresponding to the ion arising to loss of a proton from the molecular ion

 

8. Which of the following corresponds to the molecular ion in EI mass spectrometry? 
A. the most abundant ion
B. the ion with the smallest m/e
C. the ion formed by removal of an electron from the molecule
D. any ion formed by fragmentation of the molecule

 

9. What are products of the collision between high energy electrons and methane? 
A. CH4? + 2 e-
B. CH3- + H?
C. CH4+? + 2 e-
D. CH3? + H+ + 2 e-

 

10. Which of the following sets of molecular ions does an alkyl bromide possess? 
A. two molecular ions in a 2:1 ratio separated by two mass units
B. two molecular ions in a 1:1 ratio separated by two mass units
C. three molecular ions in a 1:2:1 ratio separated by two mass units
D. two molecular ions in a 3:1 ratio separated by two mass units

Dec 10 2019 View more View Less

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