NUCLEAR EQUATIONS WORKSHEET ANSWERS - TypePad Flipbook PDF

NUCLEAR EQUATIONS WORKSHEET ANSWERS 1. Write a nuclear equation for the alpha decay of 231Pa 91. 231Pa 91 4He 2 + 227Ac

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NUCLEAR EQUATIONS WORKSHEET ANSWERS 1. Write a nuclear equation for the alpha decay of 231

Pa91  4He2 +

Fr87 

o

e-1

Pa91 .

227

Ac89

2. Write a nuclear equation for the beta decay of 223

231

223

+

223

Fr87 .

Ra88

3. Write a nuclear equation for the alpha and beta decay of 149Sm62 . 149

Sm62  4He2 +

o

e-1

+

145

Pm61

4. Write a nuclear equation for the beta decay of 165

Pm61  oe-1 +

165

Pm61 .

165

Sm62

5. Write a nuclear equation for electron capture by mercury-201. 201

Hg80 +

o

201

e-1 

Au79

6. Write a nuclear equation for the alpha decay of 146

Sm62  4He2 +

142Nd

Sm62 .

60

7. Write a nuclear equation for the beta decay of At85  oe-1 +

146

198

At85 .

198

Rn86

8. Write a nuclear equation for the alpha decay of 150

Gd64  4He2 +

146

150

Gd64 .

Sm62

9. Write a nuclear equation for the beta decay of sodium-22 . 22

Na11  oe-1

+

22

Mg12

10. Write a nuclear equation for the positron emission of 120

Cs55  0e+1

+

120

Xe54

120

Cs55 .

11. Bombardment of aluminum-27 by alpha particles produces phosphorus-30 and one other particle. Write the nuclear equation for this reaction and identify the other particle. 27

Al13 + 4He2 

30

P15 + 1n0

12. Plutonium-239 can be produced by bombarding uranium-238 with alpha particles. How many neutrons will be produced as a by-product of each reaction? Write the nuclear equation for this reaction. 238

U92 +

4

239

He2 

Pu94 + 3 1n0

3 neutrons

13. When bombarded with a neutron, lithium-6 produces an alpha particle and an isotope of hydrogen. Write the nuclear equation for this reaction. What isotope of hydrogen is produced? 6

Li3 + 1n0 

4

He2

+

3

H1

H-3

14. Neutron bombardment of plutonium-239 yields americium-240 and another particle. Write the nuclear equation and identify the other particle produced.

239

Pu94 + 1n0 

240

Am95 + oe-1

beta particle

15. One method of producing plutonium-240 is by bombarding uranium-238 with deuterium (hydrogen-2), which produces neptunium-238 and 2 neutrons. The unstable neptunium then decays to produce plutonium-240. Write the nuclear equations for this two-step reaction. What other particle is produced in the second reaction? 238

U92 +

2

H1 

238

Np93 + 2 1n0 

240

Pu94 +

o

e-1

beta particle

Half-life problems – Answers 1. 12.5 grams 2. 2 grams

3. 8.75 grams 4. 4 days