<p>Graphing Radioactive Decay Integrated Science 2 Name: Per:</p><p>Introduction Radioactive dating is a very important tool in determining the age of fossils and rocks. In this activity, you will construct graphs to illustrate the decay of various radioactive elements.</p><p>Procedure Begin by completing the data tables for each of the radioactive elements. Then graph your data, and use your graph to answer the questions. 1. Uranium 238 (Half-life= 4.5 billion years) Time (billions of years) Percent of Original Material Unchanged (%) 0 100 4.5 50 9.0 13.5 18.0</p><p> a) You find a rock that has 12.5% of its Uranium 238 remaining unchanged. What is the approximate age of the rock? (Hint: use your graph.) b) You find a rock that has 35% of its Uranium 238 remaining unchanged. What is the approximate age? c) Would Uranium-238 be useful in dating something 10,000 years old? Explain.</p><p>2. Carbon-14 (Half-life= 5,568 years) Time (years) Percent of Original Material Unchanged (%) 0 100 5,568 a) You find a skeleton with 65% of its original carbon-14 remaining unchanged. How old is the skeleton?</p><p> b) Would Carbon-14 be useful in dating something 10,000 years old? Explain.</p>