Name
Date
MATH SKILLS TRANSPARENCY MASTER
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Balancing Nuclear Equations
1
238
92 U
0
234
90 Th
2
69
30 Zn
0
0
1 3
208
84 Po
4
40
20 Ca
0
5
233
92 U
10 n 0
6
2
1H
0
41
Use with Chapter 25,
Section 25.2
42 He
4
2 He
1
0n
Class
41
20 Ca 92
44 Ru
3 10 n 21 H 0 31 H Math Skills Transparency Masters
Chemistry: Matter and Change • Chapter 25
81
Name
Date
Class
41
MATH SKILLS TRANSPARENCY WORKSHEET
Balancing Nuclear Equations
Use with Chapter 25,
Section 25.2
1. In equation 1, what do the numbers 238 and 92, written to the left of the symbol U, represent?
2. Explain how both mass number and atomic number have been conserved in equation 1.
3. Write the nuclear symbol for the missing term in equation 2.
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
4. Write the nuclear symbol for the missing term in equation 3.
5. In equation 4, name the particle represented by the nuclear symbol 10n.
6. Write the nuclear symbol for the missing term in equation 4.
7. What is represented by the expression 310n in equation 5?
8. Write the nuclear symbol for the missing term in equation 5.
9. Write the nuclear symbol for the missing term in equation 6.
82
Chemistry: Matter and Change • Chapter 25
Math Skills Transparency Worksheets
T122
Name
Date
Class
41
MATH SKILLS TRANSPARENCY WORKSHEET
Chemistry: Matter and Change
Balancing Nuclear Equations
Name
Use with Chapter 25,
Section 25.2
Date
Class
42
MATH SKILLS TRANSPARENCY WORKSHEET
Solving Half-Life Problems
Use with Chapter 25,
Section 25.3
1. Write the nuclear symbol for the missing term in equation 1.
238Cm
96
1. In equation 1, what do the numbers 238 and 92, written to the left of the symbol U, represent?
238 is the mass number of the isotope, and 92 is the atomic number of
2. How much time has passed when 3.0 g 222
98Cf remain?
3.0 g/48.0 g 1/16 original amount; 1/16 (1/2)4,
the isotope.
or 4 half-lives 4 3.5 min 14 min
2. Explain how both mass number and atomic number have been conserved in equation 1.
On the left side of the equation, the mass number of uranium is 238. On the
3. How much 222
98Cf remains after 21 minutes?
Amount remaining 48.0 g (1/2)21.0 min/3.5 min 48.0 g (1/2)6 0.75 g
right side of the equation, the sum of the mass number of thorium, 234, and the
mass number of helium, 4, is also equal to 238. On the left side of the equation,
4. Write the nuclear symbol for the missing term in equation 2.
131Xe
54
the atomic number of uranium is 92. On the right side of the equation, the sum
of the atomic number of thorium, 90, and the atomic number of helium, 2, is also
5. How long will it take for 60.0 g of the original 131
53I sample to decay?
When 60.0 g has decayed, 4.0 g remain; 4.0 g/64.0 g 1/16 original amount;
equal to 92.
1/16 (1/2)4, or 4 half-lives 4 8.0 d 32 d
3. Write the nuclear symbol for the missing term in equation 2.
69Ga
31
6. How much 131
53I remains after 56 days?
Amount remaining 64.0 g (1/2)56 d/8.0 d 64.0 g (1/2)7 0.50 g
4. Write the nuclear symbol for the missing term in equation 3.
204Pb
82
7. Write the nuclear symbol for the missing term in equation 3.
146Eu
63
Math Skills Transparency Worksheets Answer Key
5. In equation 4, name the particle represented by the nuclear symbol 10n.
neutron
8. How much of the isotope 146
64Gd remains after 290 days?
Amount remaining 72.0 g (1/2)290 d/48.3 d 72.0 g (1/2)6 1.12 g
6. Write the nuclear symbol for the missing term in equation 4.
9. How much time has passed when 9.00 g 146
64Gd remain?
7. What is represented by the expression
310n
9.00 g 9.00 g/72.0 g 1/8 (1/2)3; 3 half-lives 3 48.3 d 145 d
in equation 5?
3 neutrons
8. Write the nuclear symbol for the missing term in equation 5.
139Cd
48
9. Write the nuclear symbol for the missing term in equation 6.
1H
1
82
Chemistry: Matter and Change • Chapter 25
Math Skills Transparency Worksheets
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
84
Chemistry: Matter and Change • Chapter 25
Math Skills Transparency Worksheets