Florida Science Grade 7

Chapter 3: Inside the Atom

Use Numbers

1
Tritium has a half-life of 12.5 years. If you start with 10 g, how much tritium would be left after 75 years?
A)0.725 g
B)0.313 g
C)0.255 g
D)0.156 g
2
Tritium has a half-life of 12.5 years. If you start with 15 g, how much tritium would be left after 50 years?
A)0.625 g
B)0.255 g
C)0.9375 g
D)0.725 g
3
Carbon-14 has a half-life of 5730 years. Starting with 150 g of carbon-14, how much would be left after 17,190 years?
A)25 g
B)18.75 g
C)17.25 g
D)12.5 g
4
Carbon-14 has a half-life of 5730 years. Starting with 200 g of carbon-14, how much would be left after 17,190 years?
A)18.75 g
B)17.25 g
C)25 g
D)12.5 g
5
Carbon-14 has a half-life of 5730 years. Starting with 250 g of carbon-14, how much would be left after 22,920 years?
A)17,625 g
B)12,225 g
C)15,625 g
D)14,255 g
6
Radon-222 has a half-life of 3.8 days. Starting with 60 g of radon-222, how much would be left after 38 days?
A)0.059 g
B)0.002 g
C)2.344 g
D)3.75 g
7
Radon-222 has a half-life of 3.8 days. Starting with 100 g of radon-222, how much would be left after 57 days?
A)2.344 g
B)0.002 g
C)3.75 g
D)0.059 g
8
Radon-222 has a half-life of 3.8 days. Starting with 75 g of radon-222, how much would be left after 19 days?
A)6.25 g
B)3.75 g
C)2.344 g
D)4.25 g
9
Iodine-13 has a half-life of 8 days. Starting with 60 g of radon-222, how much would be left after 32 days?
A)3.75 g
B)2.344 g
C)6.25 g
D)4.25 g
10
Iodine-13 has a half-life of 8 days. Starting with 50 g of radon-222, how much would be left after 24 days?
A)3.75 g
B)2.344 g
C)4.25 g
D)6.25 g
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