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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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7200 years ago, the ratio of 14C to 12C in the atmosphere was 10% higher than it is today. A piece of wood is known to be 7200 years old. If its age were determined using radiocarbon dating, how old would it appear to be? (The variation in atmospheric 14C with time is well understood and is corrected for in actual radiocarbon dating.)
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- A sample of bone is subjected to radiocarbon dating. The current decay rate observed for its carbon-14 content is 11.2 disintegrations per minute per gram of carbon. What is the age (in years) of the bone? The half-life for carbon-14 is 5.73 x 103 yrs, and the decay rate for carbon-14 in living organisms is 14.3 disintegrations per minute per gram of carbon.arrow_forwardIn order to solve for the rate constant, k, in two steps you must: Step One Add the same expression to each side of the equation to leave the term that includes the variable by itself on the right- hand side of the expression: (Be sure that the answer field changes from light yellow to dark yellow before releasing your answer.) +[A] - kt + [A], Drag and drop your selection from the following list to complete the answer: 1 1 [A.] -[Ao] - [A.] [Ao] Submitarrow_forwardSee attached imagearrow_forward
- A sample of charcoal from a ceremonial fire pit was determined to have a radiation count of 4.28 counts/sec from 14C radioactivity. If a living piece of wood displays 7.83 counts/second for the same type and size sample, how old is the piece of charcoal (assuming the wood was burned shortly after it died)? The half-life of 14C is 5730 years. O 4200 years 5000 years O 7200 years O 6700 yearsarrow_forward3. PuO2 has a density of 11.5 g cm- and a specific heat capacity of 330 J kg' K-1. A particular old sample (i.e. one that has 'partially decayed*) of PuO2 produces 0.440 kW kg' of heat due to internal radioactive decay. > The power output of a 2.00 cm' sample of this partially decayed' PuO2 is therefore 10.2 J/s. PuO, melts at 2673 K and its latent heat of fusion is 245 kJ kg:!. If we place our 2.00 cm block in a well insulated and heat resistant container when it is at 300 K, then how long is it before the whole block is melted?arrow_forwarda. Write the nuclear equation for the alpha decay of ^221-81Rn. b. Write the nuclear equation for the radioactive decay of ^21-15P by positron emission. c. Imagine that you started with a 0.1 g sample of iodine-131, and now you have only 0.025 g remaining. If the half-life of iodine-131 is 8 days, how old is the sample? Write 2 - 3 sentences explaining your reasoning. d. Draw a diagram that illustrates how nuclei change during nuclear fusion. Write 2 - 3 sentences describing the process of nuclear fusion, including where it occurs and how the energy released can be harnessed for use in homes.arrow_forward
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