Indiana Science Grade 8

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)0.156 g
B)0.313 g
C)0.255 g
D)0.725 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)0.255 g
B)0.9375 g
C)0.625 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)18.75 g
B)25 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)12.5 g
B)18.75 g
C)17.25 g
D)25 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)0.002 g
B)0.059 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)0.002 g
B)2.344 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)2.344 g
B)3.75 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)6.25 g
B)2.344 g
C)4.25 g
D)3.75 g
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Policy before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.