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Chapter 25 Nuclear Chemistry 669

Practice ProblemsIn your notebook, solve the following problems.

SECTION 25.1 NUCLEAR RADIATION1. What happens to the mass number and atomic number of an atom that

undergoes beta decay?

2. A radioisotope of an element undergoes alpha particle decay. How do theatomic number and mass number of the particle change?

3. Give the composition of the nucleus of the following isotopes.

a. 6428Ni b. 53136I c. 79

195 Au

4. Complete each of the following equations.

a. 614 C 10e ?

b. 95241Am 42He ?

c. 716N 168O ?

SECTION 25.2 NUCLEAR TRANSFORMATIONS1. Write a nuclear equation for the following radioactive processes.

a. alpha decay of francium-208

b. electron capture by beryllium-7

c. beta emission by argon-37

d. positron emission by fluorine-17

2. Complete the equations for these transmutation reactions.

a. 63Li 10n 42He ?

b. 92235U 10n ? 14156Ba 310n

c. 2713Al 42He ? 10n

d. 92235U 9038Sr ? 10n 410e

e. 10n ? 14458Ce 9038Sr 610n 210e

3. Polonium-214 has a relatively short half-life of 164 s. How many seconds wouldit take for 8.0 g of this isotope to decay to 0.25 g?

4. How many days does it take for 16 g of palladium-103 to decay to 1.0 g? Thehalf-life of palladium-103 is 17 days.

5. By approximately what factor would the mass of a sample of copper-66decrease in 51 minutes? The half-life of copper-66 is 5.10 min.

6. In 5.49 seconds, 1.20 g of argon-35 decay to leave only 0.15 g. What is the half-life of argon-35?

Name ___________________________ Date ___________________ Class __________________

NUCLEAR CHEMISTRY25

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670 Core Teaching Resources

SECTION 25.3 FISSION AND FUSION OF ATOMIC NUCLEI1. How many free neutrons are produced in each of the following uranium-235

fission reactions?

a. 10n 235

92U 9037Rb 14455Cs ? 10n

b. 10n 235

92U 8735Br 14657La ? 10n

c. 10n 235

92U 7230Zn 16062Sm ? 10n

2. The fission energy of uranium-235 is 2.0 107 kcal/g. The heat of combustion ofcoal is about 8.0 kcal/g. Approximately what mass of coal must be burned toproduce the energy released by the fission of 1.0 gram of uranium-235?

3. What is the product of the following fusion reaction?

4 11H 20

1e ?

SECTION 25.4 RADIATION IN YOUR LIFE1. How are radioisotopes used to study chemical reactions?

2. What is teletherapy?

Name ___________________________ Date ___________________ Class __________________

Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

05_CTR_ch25 7/12/04 8:21 AM Page 670

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