Chemistry Calculating-half life
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Graded Assignment
SCI302B: Chemistry | Unit 8 | Lessons 4 and 5: Discuss: Calculating Half-Life
Graded Assignment
Lab Report for Discussion
Answer the following questions before you participate in the discussion. Note: You will not turn in this report to your
teacher.
1.
Use Table 1: Analysis of Decay in the laboratory guide to answer this question: Scientists find a piece of
wood that is thought to be from an ancient fire circle. They find that the wood contains an amount of carbon14 (14C) that is approximately 1/16 of the current atmospheric 14C levels. Determine approximately how many
years ago the tree was chopped down to be used for the firewood. If you started with 1 million carbon-14
atoms, how many atoms would remain in the wood? 14C has a t1/2 of 5,750 years.
Answer:
2.
Why is 14C dating a good method to use for dating a human leg bone but not so good a method for dating
a dinosaur bone? You may have to check the dates of the existence of humans and dinosaurs on earth on a
chart showing the geological eras.
Answer:
3.
Potassium-40 (40K) is a radioactive material that decays into argon-40 (40Ar). The half-life of a sample of
is 1.3 billion years. Rocks containing 40K have been around since the formation of the earth, and 40Ar gas
has been accumulating in those rocks since the earth formed. However, when rocks are heated by volcanic
action, all the 40Ar leaves the rock when the gases escape. Create a scenario and discuss, based on your
knowledge of half-life, the value of potassium-argon dating to geologists.
40K
Answer:
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