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9 Questions on the Nuclear Chemistry - Assignment | CH 223, Assignments of Chemistry

Material Type: Assignment; Professor: Ziegler; Class: General Chemistry III; Subject: Chemistry ; University: Central Oregon Community College; Term: Spring 2000;

Typology: Assignments

Pre 2010

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CH 223 Ziegler Worksheet Nuclear Chemistry
1. Balance the following nuclear equations by filling in the blanks
a. 241 4 1
95 2 0
2Am He n+→+
b. 27 24 4
13 11 2
Al Si
α
+→+ +
c. 41
20
He n C+→+
12
6
d. 90 144
1235 1
092 0
37
2nU n+→++
e. 87 146
1235 1
092 0
35
3nU n+→++
f. 72
1235 1
092 0
30
4nU n+→++
2. Write balanced nuclear equations for the reactions described below.
a. Lead-210 decays by beta emission.
b. An Iron-54 is bombarded with an alpha particle to give two protons and another
nucleus.
c. Ar-40 is bombarded with another nucleus to produce K-43 and a proton.
d. Some nucleus undergoes alpha decay producing Pa-233
pf3
pf4

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CH 223 Ziegler Worksheet Nuclear Chemistry

  1. Balance the following nuclear equations by filling in the blanks

a.

241 4 1

95 Am^ +^2 He^ →^20 n +

b.

27 24 4

+ 13 Al → + 11 Si + 2 α

c.

4 1

2 He^ +^ →^0 n^ +^ C

12 6

d.

1 235 1 90 144

0 n^ +^92 U^ →^20 n +^37 +

e.

1 235 1 87 146

0 n^ +^92 U^ →^30 n +^35 +

f.

1 235 1 72

0 n^ +^92 U^ →^40 n +^30 +

  1. Write balanced nuclear equations for the reactions described below.

a. Lead-210 decays by beta emission.

b. An Iron-54 is bombarded with an alpha particle to give two protons and another nucleus.

c. Ar-40 is bombarded with another nucleus to produce K-43 and a proton.

d. Some nucleus undergoes alpha decay producing Pa-

  1. Bromine -82 has a half-life of 36 hours. A sample containing Br-82 was found to have an activity of 1.2 x 10^5 disintegrations/min. How many grams of Br-82 were present in the sample? Assume that there were no other radioactive nuclides in the sample.
  2. Lead-210 has a half-life of 20.4 years. A counter registers 1.3 x 10^4 disintegrations in 5 minutes. How many grams of Pb-210 are there?
  3. Smoke detectors contain small amounts of americium-241. Am-241 decays by emitting alpha particles and has a decay constant of 1.51 x10-3 yr-1. If a smoke detector gives off to disintegrations per second, how many grams of Am-241 are present in the detector?
  4. Krypton-87 has a rate constant of 1.5 x 10-4^ sec-1. What is the activity of a 2.0 mg sample? How long would it take for half of this much Krypton-87 in to decay?
  • b. Lithium-
  • c. Cesium-
  • d. Iron-