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WorksheetsMass Spectrometry
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
What are the steps of operation in the mass spectrometer?
a)
Accelerate, Deflect,Ionize, Detect
b)
Deflect,Ionize, Accelerate, Detect
c)
Ionize, Accelerate, Deflect, Detect
d)
Detect, Accelerate, Deflect, Ionize
2.
Which species would get deflected by the greatest degree in the mass spectrometer?
a)
12C+
b)
13C+
c)
13C2+
d)
14C+
3.
What do the peaks on the mass spectrum represent?
a)
anions
b)
different isotopes
c)
atoms with differing numbers of electrons
d)
numbers of electrons
4.
Which element does this mass spectrum most likely represent?
a)
neon
b)
scandium
c)
boron
d)
sodium
5.
What do the heights of the peaks represent in the mass spectrum?
a)
number of isotopes
b)
relative abundance of each isotope
c)
average atomic mass
d)
charge:mass ratio
6.
How many isotopes are shown in this mass spectrum?
a)
1
b)
84
c)
86
d)
4
7.
What do you expect the molar mass to be for this element?
a)
91.4 g/mol
b)
90.0 g/mol
c)
4 g/mol
d)
50. g/mol
8.
How many isotopes of this element are shown in the mass spectrum?
a)
98
b)
7
c)
100
d)
95.9 g/mol
9.
A sample of pure chlorine gas is analyzed in the MS. Which of the following is a correct interpretation?
a)
Chlorine has an isotope with a mass of 70 amu
b)
Chlorine has three known isotopes
c)
Chlorine is diatomic
d)
Chlorine is highly reactive
10.
Based on the mass spectrum, which isotope of chlorine is most abundant?
a)
35Cl
b)
37Cl
c)
70Cl
d)
72Cl
11.
Use your periodic table. There are two isotopes of rubidium: 85Rb and 87 Rb. Which is more abundant?
a)
equally abundant
b)
rubidium-85
c)
rubidium-85.47
d)
rubidium-87
12.
Carbon has three known isotopes. Which is the most abundant?
a)
carbon-12.011
b)
carbon-12
c)
carbon-13
d)
carbon-14
13.
What is the average atomic mass for this element?
a)
10 amu
b)
10.8 amu
c)
19.9 amu
d)
11 amu
14.
The average atomic mass rhenium, Re, is 186.21 amu. If 37.1% of rhenium has mass# = 185, what is the other stable isotope?
a)
Rhenium-183
b)
Rhenium-181
c)
Rhenium-187
d)
Rhenium-189
15.
The average atomic mass for nitrogen is 14.0067 amu. If you have a sample of nitrogen atoms, what is the chance that one randomly selected atom will have a mass of 14.0067 amu?
a)
0.0%
b)
0.0067%
c)
90%
d)
100%
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