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Mass Spectrum Isotopes

Total questions: 26

Worksheet time: 1hrs 23mins

Name
Class
Date
1.
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
2.
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
3.
How many isotopes are shown in this mass spectrum?
a)
1
b)
84
c)
86
d)
4
4.
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
5.
Carbon has three known isotopes. Which is the most abundant?
a)
carbon-12.011
b)
carbon-12
c)
carbon-13
d)
carbon-14
6.
What is the average atomic mass for this element?
a)
10 amu
b)
10.8 amu
c)
19.9 amu
d)
11 amu
7.

How many stable isotopes are represented on the mass spectrum?

a)

1

b)

2

c)

3

d)

4

e)

5

8.

What is the average atomic mass based on the mass spectrum data?

a)

24.32 amu

b)

22.99 amu

c)

30.84 amu

d)

25.00 amu

9.

To which element does this mass spectrum belong?

a)

Na

b)

Mg

c)

Al

d)

Ne

10.

The mass spectrum of a natural abundance of chlorine atoms is shown in the figure. Detailed analysis shows that the two stable isotopes of chlorine have masses of 34.969 amu and 36.966 amu. What are the mass numbers of the two isotopes of chlorine?

a)

34.969 amu and 36.966 amu

b)

34 and 36

c)

35 and 37

d)

17 and 17

11.

The mass spectrum of a natural abundance of chlorine atoms is shown in the figure. Detailed analysis shows that the two stable isotopes of chlorine have masses of 34.969 amu and 36.966 amu. What is the approximate percent abundance of the lighter isotope?

a)

20

b)

25

c)

50

d)

75

12.

The mass spectrum of an unknown sample shows four peaks. Use the data below to calculate the relative atomic mass of the sample.

a)

83.8 amu

b)

52.1 amu

c)

52.5 amu

d)

52.3 amu

13.

What element's mass spectrum is represented below?

a)

Re

b)

As

c)

W

d)

Mo

14.

The mass spectrum below represents a mixture of elements. What elements are present? Click 2.

a)

As

b)

S

c)

Ag

d)

Mn

15.

Investigate the mass spectra attached. Which peak is the most abundant?

a)

90

b)

91

c)

94

d)

92

e)

96

16.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
17.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?
a)
32
b)
33
c)
34
d)
no way to know
18.
An element has three different isotopes. One has a mass of 35.00 amu; another has a mass of 36.00  amu; and another has a mass of 38.00  amu. What is the average atomic mass of this element?
a)
36.33 amu
b)
37.00 amu
c)
12.11 amu
d)
impossible to tell
19.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
20.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
21.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
22.
Atom 1 has Mass=12  Protons=6
Atom 2 has Mass= 14 Electrons=6
Are these atoms isotopes of each other or different elements?
a)
Different Elements - Mg & Si
b)
Different Elements - Ar & Ca
c)
Isotopes of Carbon
d)
Isotopes of Magnesium
23.
What is the name of the atom pictured here?
a)
Nitrogen
b)
Nitrogen-15
c)
Nitrogen-7
d)
Nitrogen-8
24.
Compute the average atomic mass for silicon:
a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
25.
Which of the following could have 82 neutrons?
a)
W-182
b)
Ta-181
c)
Cs-132
d)
Ba-138
26.
If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?  
I. 7735X  II. 7733X  III. 8137X  IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III

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