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- 1. Multiple Choice
What do the peaks on the mass spectrum represent?
anions
mass of positively charged fragments
mass of negatively charged fragments
numbers of electrons
- 2. Multiple Choice
Which of the following is NOT a step in the operation of a mass spectrometer?
Accelerate,
Deflect
Radiate
Ionize
- 3. Multiple Choice
The above Mass Spectra of an unknown substance contains an M+ peak of 64 and an M+2 Peak. What is the molecular weight of this substance?
29
49
64
66
- 4. Multiple Choice
The above Mass Spectra of an unknown substance contains an M+ peak of 64. Which of the following could be the formula for this substance?
CH3CH2Cl
CH3CH2CH2NH2
CH3CH2Br
CH3CH2N2
- 5. Multiple Choice
What is the molecular weight of this compound?
29
87
54
15
- 6. Multiple Choice
Which of the following molecular formulas could correspond to the above mass spectrum?
C6H5Br
C6H5Cl
C6H5CH2Br
C6H5CH2Cl
- 7. Multiple Choice
Which of the following fragments could correspond to Peak C?
+CH3
+CH2CH3
+CH2CH2CH3
+CH2CH2CH2CH3
- 8. Multiple Choice
Which of the following fragments could correspond to Peak D?
+CH3
+CH2CH3
+CH2CH2CH3
+CH2CH2CH2CH3
- 9. Multiple Choice
Which of the following molecular formulas could match this mass spectra (above)?
C5H12
C7H16
C10H22
C12H26
- 10. Multiple ChoiceWhat are the steps of operation in the mass spectrometer?Accelerate, Deflect,Ionize, DetectDeflect,Ionize, Accelerate, DetectIonize, Accelerate, Deflect, DetectDetect, Accelerate, Deflect, Ionize
- 11. Multiple ChoiceWhich species would get deflected by the greatest degree in the mass spectrometer?12C+13C+13C2+14C+
- 12. Multiple ChoiceWhat do the peaks on the mass spectrum represent?anionsdifferent isotopesatoms with differing numbers of electronsnumbers of electrons
- 13. Multiple ChoiceWhat do the heights of the peaks represent in the mass spectrum?number of isotopesrelative abundance of each isotopeaverage atomic masscharge:mass ratio
- 14. Multiple ChoiceHow many isotopes are shown in this mass spectrum?184864
- 15. Multiple ChoiceUse your periodic table. There are two isotopes of rubidium: 85Rb and 87 Rb. Which is more abundant?equally abundantrubidium-85rubidium-85.47rubidium-87
- 16. Multiple ChoiceWhat is the average atomic mass for this element?10 amu10.8 amu19.9 amu11 amu
- 17. Multiple Choice
How many stable isotopes are represented on the mass spectrum?
1
2
3
4
5
- 18. Multiple Choice
The mass spectrum of an unknown sample shows four peaks. Use the data below to calculate the relative atomic mass of the sample.
83.8 amu
52.1 amu
52.5 amu
52.3 amu
- 19. Multiple Choice
The mass spectrum below represents a mixture of elements. What elements are present? Click 2.
As
S
Ag
Mn
- 20. Multiple Choice
Investigate the mass spectra attached. Which peak is the most abundant?
90
91
94
92
96
- Answer choicesTagsAnswer choicesTags