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Constructed Response . Topic 12: Nuclear Chemistry
Set F: Radioactivity, medical uses of radioisotope, half-life, writing nuclear equation
Base your answers to questions 12 through 14 on the information below, the Reference Tables for
Chemistry, and your knowledge of chemistry.
Radioactivity and radioactive isotopes have the potential for both benefiting and
harming living organisms. One use of radioactive isotopes is in radiation therapy
as a treatment for cancer. Cesium-137 is sometimes used in radiation therapy.
A sample of cesium-137 was left in an abandoned clinic in Brazil in 1987. Cesium-137
gives o ff a blue glow because of its radioactivity. The people who discovered the
sample were attracted by the blue glow and had no idea of any danger. Hundreds
of people were treated for overexposure to radiation, and four people died.
12. Suppose a 40-gram sample of iodine-131 and a 12.
Teacher Preview Copy
40-gram sample of cesium-137 were both abandoned in
the clinic in 1987. Explain why the sample of iodine-131
would not pose as great a radiation risk to people as the
sample of cesium-137 would.
13. If 12.5 grams of the original sample of cesium-137 13.
remained after 90.69 years, what was
the mass of the original sample?
Teacher Preview Copy
137
14. Using Reference Table N, complete the equation 14. Cs ------ > ______ + ______
provided in your answer booklet for the radioactive 55
137
decay of Cs. Include both atomic number and mass
55
number for each particle.
Set G: Identifying nuclear equations
Identify the type of nuclear reaction represented by each equation below.
3
2
1
15. H + H ---------- > He 15.
1 1 2
4
16. 210 Po ------------------ > He + 206 Pb 16.
84 2 82
1
4
14
17. He + 11 B ------- > N + n 17.
2 5 7 0
0
18. 214 Bi ------------------ > 214 Po + e 18.
84 -1
83
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 413
Set F: Radioactivity, medical uses of radioisotope, half-life, writing nuclear equation
Base your answers to questions 12 through 14 on the information below, the Reference Tables for
Chemistry, and your knowledge of chemistry.
Radioactivity and radioactive isotopes have the potential for both benefiting and
harming living organisms. One use of radioactive isotopes is in radiation therapy
as a treatment for cancer. Cesium-137 is sometimes used in radiation therapy.
A sample of cesium-137 was left in an abandoned clinic in Brazil in 1987. Cesium-137
gives o ff a blue glow because of its radioactivity. The people who discovered the
sample were attracted by the blue glow and had no idea of any danger. Hundreds
of people were treated for overexposure to radiation, and four people died.
12. Suppose a 40-gram sample of iodine-131 and a 12.
Teacher Preview Copy
40-gram sample of cesium-137 were both abandoned in
the clinic in 1987. Explain why the sample of iodine-131
would not pose as great a radiation risk to people as the
sample of cesium-137 would.
13. If 12.5 grams of the original sample of cesium-137 13.
remained after 90.69 years, what was
the mass of the original sample?
Teacher Preview Copy
137
14. Using Reference Table N, complete the equation 14. Cs ------ > ______ + ______
provided in your answer booklet for the radioactive 55
137
decay of Cs. Include both atomic number and mass
55
number for each particle.
Set G: Identifying nuclear equations
Identify the type of nuclear reaction represented by each equation below.
3
2
1
15. H + H ---------- > He 15.
1 1 2
4
16. 210 Po ------------------ > He + 206 Pb 16.
84 2 82
1
4
14
17. He + 11 B ------- > N + n 17.
2 5 7 0
0
18. 214 Bi ------------------ > 214 Po + e 18.
84 -1
83
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 413
