Carbon 14 has a radioactive half-life of 5700 years. If an organism has 10 g of carbon 14 in its body at the time of its death, how much carbon 14 will remain after 5700 years?
The half-life of palladium-100 is 3.6 days. A sample of 12.0 grams of palladium-100 is left alone for 10 days. About much of the original sample remains?
Uranium-233 has a half-life of about 16,000 years. A sample of Uranium weighs 6.0 x 10-3 grams. How many grams of Uranium-233 will be in the sample if 48,000 years?
An isotope with unknown half-life starts as a sample of 12 g. In 20 days, the sample has only 1.5 g of the isotope left. What is the half-life of isotope?
The half-life of uranium-238 is 4.5 billion years. The half-life of potassium-40 is 1.25 billion years. A rock is found with half of its original potassium-40 content. How much of its original uranium-238 content remains in the rock?
A rock formed with 1,000 atoms of a radioactive parent element, but only contains 250 radioactive parent atoms today. If the half-life is 1,000,000 years, how old is the rock?
Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with (and 0 atoms of BB), how long will it take for there to be 2,500 atoms of AA?
4. A new element, Tyserium (Ty), has recently been discovered and consists of two isotopes. One isotope has a mass of 331 g/mol and is 35.0 % abundant. The other isotope is 337 g/mole and is 65.0 % abundant. What is the mass of Ty as it appears on the periodic table?
5. Copper has two isotopes, CU-63 and CU-65. If the atomic mass of copper is 63.5 g/mol, what is the % of each isotope?